Luminance vs Robin AI: how they compare in 2026

This is the widest gap on any pair page in the index and it is worth understanding why before treating it as a verdict on the products. Luminance sits in the top two bands on ten of fifteen axes, Robin AI on three, and almost every point of separation is a document Luminance publishes and Robin AI does not. Luminance publishes a benchmark built on 189,000 annotated data points, gives every customer a dedicated single tenant instance with no data co mingling, and documents access control down to the fact that its own staff cannot view customer documents. Robin AI publishes real controls too, but its training commitment is the weakest located anywhere in this index: it says customer data will not be used for training without express consent, which is a permission you can grant rather than a prohibition it has accepted. For a confidentiality review, that is the sentence that matters.

Luminance profileRobin AI profile
Last verifiedAugust 30, 2026

At a glance

Category
Contract Review & Drafting
Contract Review & Drafting
Founded
2015
2019
Headquarters
Cambridge, United Kingdom
London, United Kingdom
Last verified
Aug 29, 2026
Aug 29, 2026

All 15 axes, side by side

The same grid applied to every vendor in the index, graded from public sources. Hover a grade to see what the letter means on that axis.

AI Centrality

How much of the product is actually AI. Whether the machine learning is the mechanism the buyer is paying for or a feature layered onto conventional software, and whether the vendor is specific about which is which.

AA on AI CentralityThe artificial intelligence is the product. Remove the models and there is nothing left to sell.
AA on AI CentralityThe artificial intelligence is the product. Remove the models and there is nothing left to sell.
Luminance

The artificial intelligence is the product, and the vendor owns more of the stack than almost anyone on this index. Founded by mathematicians in 2015, it runs a multi model architecture it calls a Panel of Judges combining foundation, fine tuned and proprietary models, and ships its own legal intelligence model, Luna Crescent, trained in house and deployed in its own environment. Remove the models and there is no product.

Robin AI

The models are the product. Review, redlining, the Word add in's Ask, Draft, Edit and Research modes, clause level risk analysis and repository search are all generative or machine learning capabilities. The vendor's stated training base is more than 4.5 million legal documents and 100 million legal clauses. One qualification worth recording rather than discounting: the company also sells Managed Services combining the software with human legal review, so part of what it sells is people. The software product graded here is nonetheless model driven throughout.

Citation Accuracy and Hallucination Disclosure

Whether the vendor publishes measured accuracy on citations and assertions, grounds output to primary sources, and says plainly what its system does when it does not know. Legal has a documented public record of fabricated citations reaching filed briefs, so an untested claim of accuracy is not evidence.

BB on Citation Accuracy and Hallucination DisclosureGrounding is real and documented, with linked primary sources and a described retrieval method, short of published accuracy figures an outsider can test.
CC on Citation Accuracy and Hallucination DisclosureAccuracy is asserted without measurement, or grounding is claimed while output cites sources the reader cannot open and verify.
Luminance

Substantive disclosure with a real gap. The vendor publishes ContractIQ Bench, a proprietary benchmark of 189,000 manually annotated and reviewed data points assessing interpretation of named provision types including liability caps, termination for convenience and confidentiality obligations, tested on held out documents and concepts excluded from training, with blind evaluations by legal experts alongside. It publishes a result, 5 percent higher accuracy than leading general purpose models on contract understanding, and a speed figure of 200 to 400 tokens per second. It also states a design principle directly relevant to this axis: the model is trained to prioritise faithful extraction and to identify absence rather than invent an answer. Two gaps keep it off an A. The published figure is a relative delta with no absolute accuracy rate and no named comparator models, so a reader cannot tell what 5 percent higher is 5 percent higher than. And the benchmark is proprietary, with no sample tasks or rubric published, so an outsider cannot inspect or re run it.

Robin AI

Accuracy is asserted without measurement. Published grounding exists in outline: the Word add in has a Research mode described as enhancing answers with authoritative, up to date information from a curated set of trusted legal sources on the web, and review output is clause level with risk flags tied to company standards. What is not published is what makes this axis work: no accuracy figure, no hallucination rate, no test set, no evaluation methodology, and no description of how retrieval reaches those trusted sources or how a reader opens and verifies one. The headline claim across vendor material is a speed figure, 80 to 85 percent faster review, rather than an accuracy figure. Searched the site, the platform pages, the security page, Robin University and the guides and reports index on 29 Aug 2026.

Autonomy and Oversight Model

What the system decides on its own, what a lawyer must approve, and whether the vendor documents where the review point sits. A tool that drafts under review and a tool that files without one are different products and different risks.

BB on Autonomy and Oversight ModelA written commitment that the models work alongside a supervising lawyer, with real review surfaces, short of the full control structure: commonly the threshold at which the system stops or what happens after it is wrong.
BB on Autonomy and Oversight ModelA written commitment that the models work alongside a supervising lawyer, with real review surfaces, short of the full control structure: commonly the threshold at which the system stops or what happens after it is wrong.
Luminance

A real published commitment with a described control mechanism, short of the full structure. The Panel of Judges architecture is itself an oversight design and is documented: multiple models analyse each clause independently and reach consensus, which the vendor states reduces hallucination risk. Outputs are described as traceable, and Traffic Light Analysis ranks deviation risk visually so a reviewer sees where to look. The vendor publishes a position piece arguing that human in the loop alone is insufficient and that systems must be designed for accuracy and transparency, which is a real stated philosophy rather than a slogan. Not located as of 29 Aug 2026: where the review point sits when the product negotiates with a counterparty directly, the threshold at which it escalates to a lawyer, and what the vendor commits to when an output is wrong. That first gap matters here more than for most, because the product sends agreements to counterparties and negotiates on the customer's behalf.

Robin AI

A real published commitment that the models work alongside a supervising lawyer, with documented review surfaces, short of the full control structure. The Word add in is described as surfacing clause level recommendations as tracked changes, comments or highlighted text based on company standards, which a lawyer accepts or rejects in place, and the four modes separate asking from drafting from editing so the user chooses the level of intervention. The company's Managed Services line puts its own legal professionals in the loop as a paid option, which is an unusually literal form of oversight. Not located as of 29 Aug 2026: any threshold at which the system defers, what it does on its own, and what the vendor commits to when an output is wrong.

Operational and Outcome Evidence

Named, dated evidence that the product works in production at real firms or legal departments. Case studies with figures and identified customers count. Unattributed testimonials and launch announcements do not.

BB on Operational and Outcome EvidenceReal deployment evidence with substance, short of full attribution or measurement: a named customer without figures, or figures without the named customer.
CC on Operational and Outcome EvidenceCustomer logos and unattributed testimonials stand in for evidence, or results are quoted with no basis stated.
Luminance

Real deployment evidence with substance, short of attribution and method. Named customers appear in vendor and trade material including Hitachi, AMD, BBC Studios, Yokogawa and Koch, alongside a stated base of more than 700 organisations across 70 plus countries and all four of the Big Four consultancies. A customers page is published. The recurring figure, negotiation time reduced by up to 90 percent, is a vendor claim carrying a hedge and is not tied to any named customer, dated, or accompanied by a method. Searched the site, the customers page, the press releases and the resources index on 29 Aug 2026 and located no case study pairing a named organisation with figures and a date.

Robin AI

Customer logos and press mentions stand in for evidence, with results quoted from an internal source. A customers page exists and press logos including the Financial Times, Bloomberg, Forbes and CNBC are displayed prominently, alongside investor logos including Google, Temasek and PayPal. The most specific published figure, review completed over 85 percent faster, is attributed to the vendor's own internal legal team testing its own add in rather than to a customer. Searched the site, the customers page, the news and blog indexes and the guides and reports index on 29 Aug 2026 and located no named customer deployment carrying figures, a date and an assessable method. Press coverage and investor backing are not deployment evidence.

Privilege and Confidentiality Posture

How client confidences are handled: attorney client privilege and work product treatment, segregation of one client matter from another, whether client data trains any model, and what the vendor commits to in writing rather than in marketing.

BB on Privilege and Confidentiality PostureSubstantive published commitments on confidentiality and training use, short of the full picture: commonly silence on segregation between users or matters, or on what the underlying model provider may retain.
CC on Privilege and Confidentiality PostureConfidentiality is asserted in general terms, or the commitment lives only in a sales conversation and cannot be read in advance.
Luminance

Substantive published commitments, short of the full picture. Segregation is the strongest element and is documented precisely: each customer receives a dedicated single tenant instance with complete isolation and no co mingling of data, which exceeds the level this buyer segment requires under the amended band. Access control is documented at an unusual depth, including that vendor staff cannot view customer documents without explicit authorisation given through the user interface, with all access tracked and audited. Encryption is specified to the key management service, cipher and rotation practice. Two gaps hold this off an A. No training prohibition on customer content was located anywhere in vendor material, which is a conspicuous absence for a vendor that trains its own models and publishes a corpus figure of 220 million legal documents. Attorney client privilege and work product handling is not addressed directly.

Robin AI

Confidentiality is asserted in general terms and the one commitment that matters carries a qualifier that changes it. The security page states that customer data will not be used for model training, fine tuning or other feature development without express consent. That is a consent gated permission rather than a prohibition, and it is the weakest training position located on this index so far. Real controls are published: AES-256 at rest, current TLS in transit, and a statement that data never leaves the vendor's AWS environment. Not located as of 29 Aug 2026: attorney client privilege or work product handling, any segregation model between customers, users or matters, and any retention or deletion terms. For a product whose core use case is ingesting counterparty contracts at volume, the absence of a segregation statement is material.

UPL and Professional Responsibility Posture

Whether the vendor is clear that it supplies a tool rather than legal advice, who its audience is, and how it addresses unauthorized practice of law, competence and supervision duties, and jurisdiction limits. ABA Formal Opinion 512 is the reference point.

CC on UPL and Professional Responsibility PostureA boilerplate disclaimer sits in the terms while the marketing describes the product in advice terms, or the intended audience is left ambiguous.
CC on UPL and Professional Responsibility PostureA boilerplate disclaimer sits in the terms while the marketing describes the product in advice terms, or the intended audience is left ambiguous.
Luminance

A boilerplate structure sits in the terms while the product is sold well beyond lawyers. Dedicated solution pages target compliance, executive, sales, procurement, finance, human resources and marketing teams alongside legal, and the product negotiates contracts on a customer's behalf. Searched the site, the solution pages, the published terms and conditions, the privacy policy and the resources index on 29 Aug 2026 and located no position on advice versus tooling, no treatment of competence or supervision duties, and no statement of jurisdiction limits, despite operation in more than 70 countries. This is the widest version of the non lawyer distribution question on the index so far, since the tool is marketed to marketing and HR departments.

Robin AI

The intended audience is lawyers and legal teams and the terms carry a standard structure, but no position on the advice line is published. Searched the site, the platform and services pages, the published terms and the privacy policy on 29 Aug 2026 and located no statement on advice versus tooling, no treatment of competence or supervision duties, and no jurisdiction limits, despite the company operating across the UK, US and Singapore and marketing to multiple jurisdictions. The Managed Services line, in which the vendor's own legal professionals perform review work for customers, raises the advice line question more sharply than a pure software product would, and nothing published addresses how that service is scoped or supervised.

AI Governance and Bias Disclosure

Published governance over model behaviour: who owns it inside the vendor, what is tested before release, and what is disclosed about disparate output across matter types, parties, or populations.

CC on AI Governance and Bias DisclosureResponsible AI principles are published without a mechanism, a testing regime, or anything a buyer could audit.
DD on AI Governance and Bias DisclosureNo governance position published for a system whose output affects legal outcomes.
Luminance

Principles and architecture are published without a governance mechanism a buyer could audit. What exists is real and substantial: a published white paper on how the AI is built, a named Director of AI who authors technical material under his own name, a Cambridge based research team, a described validation regime through ContractIQ Bench, and a security advisory board of named external experts. But the security advisory board governs security rather than model behaviour, and no equivalent exists for AI governance. Not located as of 29 Aug 2026: a named owner of model governance, a pre release testing gate as distinct from benchmark results, an AI management certification such as ISO 42001, and anything on uneven output across matter types, parties or populations.

Robin AI

Searched the site, the security page, the trust centre entry point, the platform pages, the blog, the news index and the guides and reports index on 29 Aug 2026. No governance position for model behaviour was located: no named internal owner, no pre release testing regime, no published responsible AI or AI governance framework, no AI specific certification such as ISO 42001, and nothing on uneven output across matter types, parties or populations. The vendor publishes real security governance, which is a different subject. Rebuttable with a single link.

AI Safety and Data Stewardship

Retention, deletion, access control, and what happens to prompts and documents after they are processed. Whether the vendor states its subprocessors and its incident practice, or leaves the buyer to assume.

BB on AI Safety and Data StewardshipSubstantive published policy covering most of the ground, short of the full set: commonly no named subprocessor list or no stated incident practice.
CC on AI Safety and Data StewardshipA generic privacy policy covers the product without addressing what happens to documents and prompts after processing.
Luminance

Substantive published policy covering most of the ground, at an unusual level of specificity. Published in the security FAQ: AWS Key Management Service encryption at S3 and EC2 level with AES-256 keys rotated regularly, TLS 1.2 or higher in transit, dedicated single tenant instances, role based and division level permissions configured by the customer under least privilege, configurable password and session timeout policy, mandatory staff security training, named threat detection through Darktrace's Enterprise Immune System and Juniper firewalls, and a described incident management process covering detection, mitigation and communication. Backups are stated precisely: nightly to a secondary AWS data centre in the same region, encrypted, retained a minimum of 14 days. Not located as of 29 Aug 2026: a retention period or deletion control for customer documents in normal operation as distinct from backups, and a named subprocessor list.

Robin AI

A generic security posture covers the product without addressing what happens to documents and prompts after processing. Published and real: AES-256 at rest, current TLS in transit, security integrated through the development lifecycle, data replication across geographic locations with disaster recovery exercises and automated failover, and named monitoring tooling in AWS CloudWatch, CloudTrail and Datadog. That is operational security described at a useful level of detail. What this axis asks for and did not locate as of 29 Aug 2026: any retention period for documents or prompts, any deletion control, a named subprocessor list, and an incident or breach notification practice. Anthropic and AWS are named as partners on the security page, which is a partial supply chain disclosure rather than a subprocessor list.

AI Liability and Recourse

What the vendor stands behind contractually when its output is wrong. Indemnities, caps, carve outs, insurance, and whether any of it is published or only reachable through a negotiated agreement.

CC on AI Liability and RecourseLiability is addressed only through a standard limitation clause that disclaims the exposure the product creates.
CC on AI Liability and RecourseLiability is addressed only through a standard limitation clause that disclaims the exposure the product creates.
Luminance

Liability is addressed only through published terms carrying a standard structure. Terms and conditions are published openly alongside a privacy policy, cookie policy and anti slavery statement, so a buyer can read the allocation of loss before entering a sales process, which keeps this above a pure absence. Searched those documents, the security page and the security standards white paper entry point on 29 Aug 2026 and located no indemnity running to the customer for third party claims arising from output, no warranty on output, no stated liability cap figure and no insurance position. Worth noting the product negotiates with counterparties on a customer's behalf, which raises the recourse question more sharply than a review only tool.

Robin AI

Liability is addressed only through published terms carrying a standard limitation structure. Terms and a privacy policy are published openly, so a buyer can read the allocation of loss before entering a sales process, which keeps this above a pure absence. Searched those documents, the security page and the trust centre entry point on 29 Aug 2026 and located no indemnity running to the customer for third party claims arising from output, no warranty on output, no stated liability cap figure and no insurance position. Worth noting that the Managed Services line involves the vendor performing legal review work, which raises a distinct recourse question that published material does not address.

Practice Systems Integration Depth

How deeply the product reaches into the systems legal work already lives in: document management such as iManage and NetDocuments, Word and Outlook, contract lifecycle management, matter management, e-billing, and court filing systems.

CC on Practice Systems Integration DepthIntegrations are listed as logos or marked as coming, with no documentation an implementer could use.
CC on Practice Systems Integration DepthIntegrations are listed as logos or marked as coming, with no documentation an implementer could use.
Luminance

Integrations are asserted at platform level with no documentation an implementer could use. The vendor describes connecting intake, negotiation, workflow and repository intelligence in one platform, and a Collaborate product exists for working with counterparties, and third party sources reference Microsoft Word and Outlook working surfaces. What was not located on the vendor's own property as of 29 Aug 2026, after checking the platform pages, the technology page, the security page and the resources index, is any integrations page, any named connector for document management, contract lifecycle, e signature, CRM or ERP, and any description of what an integration moves or what an administrator configures. For an enterprise platform sold to procurement and finance functions, that absence is notable.

Robin AI

Integrations are claimed without documentation an implementer could use. The Microsoft Word add in is real, documented at user level in Robin University, and is the primary surface, alongside a browser application with a searchable executed contract repository. Beyond Word, third party sources describe CRM and CLM integration but no vendor integrations page was located, and no named connector for document management, contract lifecycle or e signature was located on the property as of 29 Aug 2026. A third party review notes limited file format support beyond Word documents. Nothing published describes what any integration moves, in which direction, or what an administrator configures.

Deployment Model and Data Residency

Where the software runs and where the data sits. Multi tenant cloud, single tenant, private deployment, on premises, and whether region of residence is a published option or an enterprise conversation.

BB on Deployment Model and Data ResidencyDeployment model is stated clearly with partial residency detail, or residency is offered without the processing location being addressed.
CC on Deployment Model and Data ResidencyCloud delivery is implied and neither the tenancy model nor the region is stated.
Luminance

Deployment model is stated clearly with partial residency detail. Three things are published and specific: a dedicated single tenant AWS instance per customer with complete isolation, deployment within the customer's own environment as an alternative to the hosted option, and backup to a secondary AWS data centre within the same region, which confirms data stays in region. The vendor states AWS global infrastructure provides a solution tailored to geographic requirements. What is missing is the list: no named available regions, no statement of which regions a customer may select, and no statement of where processing happens as distinct from where data is stored. The single tenant and on premises options are genuinely stronger than most of this index.

Robin AI

Cloud delivery is stated and neither the tenancy model nor the region is stated. The vendor publishes that data never leaves its AWS environment and that data is replicated across multiple geographic locations for disaster recovery, which is a resilience statement rather than a residency one and arguably cuts against a customer wanting data confined to a jurisdiction. Not located as of 29 Aug 2026: any named region, any customer selectable residency, any tenancy model, and any statement of where processing happens as distinct from where data is stored. Third party sources mention private cloud deployment options, which is not vendor material and does not move this axis. For a UK founded vendor selling into the UK, US and Singapore, published residency options would be expected.

Security Certifications and Trust Center

Independent attestation a buyer can pull without a sales call: SOC 2, ISO 27001, penetration test summaries, a trust center with current reports and named scope rather than a badge image.

BB on Security Certifications and Trust CenterCertification is real and stated, short of accessible evidence: a named standard without scope, date, or a way to obtain the report.
BB on Security Certifications and Trust CenterCertification is real and stated, short of accessible evidence: a named standard without scope, date, or a way to obtain the report.
Luminance

Certification is real and stated with correct nouns, short of accessible evidence. ISO 27001:2022 is named with its version and described as certification, and the SOC 2 Type 2 language is precise: the vendor says successful completion of a SOC 2 Type 2 examination assessing controls related to security, availability and confidentiality, which is the correct noun for SOC 2 and names the trust services criteria in scope. That is more careful phrasing than most vendors on this index manage. Regular independent third party penetration testing is stated. A named external security advisory board including a former Director General of MI5 and two former Darktrace executives is published with full biographies. What is missing is the evidence route: no trust portal was located, no report is downloadable or requestable through a published flow, and no coverage period, report date or auditor name was located as of 29 Aug 2026. A security standards white paper is published, which is the nearest thing to an evidence route.

Robin AI

Certification is real and stated with an open access route, short of scope and evidence. ISO 27001 and SOC 2 are both named as certified and GDPR compliance is stated, and a trust centre is published at a stable URL as a self serve route rather than a sales gate, which under the three tier test is materially better than absent. What was not located as of 29 Aug 2026 is any coverage period, audit scope, report date, SOC 2 type designation or named auditing firm. Note the vendor writes ISO without a number in one place on the security page and ISO27001 in another; the certification is stated clearly enough elsewhere that this reads as loose copy rather than a claim problem, and it is recorded rather than concluded on.

Model Supply Chain Disclosure

Which models sit underneath, whose they are, where they run, and whether the vendor commits to telling customers when that changes. A legal buyer inherits every dependency it cannot see.

BB on Model Supply Chain DisclosureThe supply chain is partly disclosed: providers named without change notification, or architecture described without the providers.
CC on Model Supply Chain DisclosureThe vendor refers to advanced or proprietary models without identifying what sits underneath.
Luminance

The supply chain is partly disclosed and the architecture is described in more depth than most. The vendor publishes that it runs a multi model Panel of Judges combining foundation, fine tuned and proprietary models, that it continuously evaluates and selects the best model per task, and that its own model Luna Crescent is deployed inside its own AWS environment. It states the supply chain consequence explicitly and in the customer's terms: owning the model reduces reliance on external model providers, limits data exposure to additional subprocessors, and protects customers from third party availability, pricing and access disruption. Hosting is named as AWS. What is not published is which foundation models sit in the panel, from which providers, or which tasks route to them, and no subprocessor list or change notification commitment was located as of 29 Aug 2026. A buyer therefore knows the shape of the chain and its own model, but not the third party links in it.

Robin AI

The vendor identifies a partner without disclosing the supply chain. Anthropic and AWS are both named as partners on the security page, and third party coverage describes collaboration with Anthropic and AWS to build secure models, so a reader can infer the likely model provider. But naming a partnership is not the same as stating which model serves which task. Not located as of 29 Aug 2026: which models are used in production, where they run, whether any other provider is involved, a subprocessor list, or any commitment to notify customers when the supply chain changes. Graded on what is published rather than on the inference the partner logo invites.

Commercial Transparency

Whether a buyer can learn what this costs without entering a sales process: published rates, the unit being charged, what sits behind an enterprise tier, and what implementation adds.

DD on Commercial TransparencyNo pricing information published at any level, including the unit of charge.
DD on Commercial TransparencyNo pricing information published at any level, including the unit of charge.
Luminance

Checked the site navigation, the platform and solution pages, the customers page, the about section and the footer on 29 Aug 2026. No pricing page exists on the property, no rate is published, no unit of charge is stated and no tier structure appears. Every commercial path terminates in a demo request. No free trial or self serve entry point was located, and no third party pricing figure was located either.

Robin AI

Checked the site navigation, the platform and services pages, the customers page and the footer on 29 Aug 2026. No pricing page exists on the property, no rate is published, no unit of charge is stated and no tier structure appears. Every commercial path terminates in a demo request. Vendor material references a free account with add in access and paid accounts with playbook customisation, and directs the reader to speak to a member of the team to understand what paid accounts include, so even the feature split between free and paid is not published. Third party sources describe subscription pricing without figures.

Firm and Practice Coverage

Who the product is actually built for. AmLaw, midlaw, small firm and solo, in house departments, government and courts, and which practice areas are supported rather than merely claimed.

AA on Firm and Practice CoverageWho the product serves is documented precisely: firm segments, in house and government use, and the practice areas actually supported, with the limits stated.
CC on Firm and Practice CoverageCoverage is claimed broadly, for all firms or all practice areas, without evidence that the breadth is real.
Luminance

Who the product serves is documented precisely across two dimensions, each with its own published pages. Six industries: manufacturing, financial services, pharmaceutical, technology, insurance and chemical. Eight business functions: legal, compliance, executive, sales, procurement, finance, human resources and marketing. Both law firms and corporate legal departments are addressed, with a stated base of more than 700 organisations across more than 70 countries including all four Big Four consultancies and named enterprises. An academic programme is published as a separate segment. The practice boundary is clear from the structure and consistent throughout: this is contract work end to end, from generation through negotiation to post execution analysis and investigation, and nothing on the property claims litigation or research capability it does not have.

Robin AI

Coverage is claimed broadly without evidence that the breadth is real. Vendor material addresses in house legal teams, law firms and corporate clients across multiple jurisdictions, and the practice focus is clearly contract work: review, drafting, negotiation and post signature obligation tracking, with third party sources naming NDAs, service agreements, procurement and employment agreements. Three offices are published across London, New York and Singapore. What was not located as of 29 Aug 2026 is any segmentation a buyer could use: no pages by firm size, industry or role, no statement of which practice areas or team sizes the product is built for, and no statement of what it is not built for. The customers page exists but does not resolve the segments claimed.

The 12 legal signals, side by side

Recorded rather than graded. These are the questions a practitioner has to answer before a tool touches a client matter, and the answers are taken from public material only.

Client Data in Training

Can material a lawyer puts into this product be used to train a model?

Luminance
Terms silent

Searched the security page and its FAQ, the technology page, the Luna Crescent announcement, the published terms and conditions, the privacy policy and the resources index on 29 Aug 2026. No located term or policy states whether customer content may be used to train models, either way. The absence is more consequential here than for a vendor that only calls third party APIs: this vendor trains its own models, publishes a corpus figure of more than 220 million verified legal documents accumulated over a decade of platform use, and describes that corpus as something general purpose providers cannot replicate. Vendor material states the platform has been exposed to those documents without stating whether customer documents are among them or on what basis. Recorded as silent under the rule that a value is never inferred from the absence of a contradiction.

Robin AI
Opt in

The security page states that customer data will not be used for model training, fine tuning or other feature development without express consent. Read precisely, that is a commitment not to train absent consent rather than a prohibition, so training becomes available where consent is given, and no material was located describing how consent is sought, at what level it is given, or whether it is a contract term or a product setting. The vendor's trust centre separately states data is never used to train other AI models, which addresses third party models rather than its own. Recorded at the opt in value as the closest published fit, with the qualifier and the ambiguity stated here rather than resolved.

Prompt and Output Retention

How long does the product keep what a lawyer typed, and can that be set to zero?

Luminance
Disclosed without a period

Retention is acknowledged and partly quantified without a period for the primary system. The security FAQ states each customer instance is backed up nightly to a secondary AWS data centre in the same region, encrypted, and kept for a minimum of 14 days, which is a real published figure and a floor a buyer can plan against. What was not located as of 29 Aug 2026 is any retention period for documents, prompts or outputs in normal operation, any customer control over that window, or any deletion commitment. A minimum backup retention states how long data persists after deletion rather than how long it is held.

Robin AI
Not addressed

Searched the security page, the trust centre entry point, the published terms, the privacy policy and the help centre entry point on 29 Aug 2026. No public material states how long documents, prompts or outputs are retained, whether a customer controls the window, or whether deletion is available. The vendor does publish that data never leaves its AWS environment and that data is replicated across multiple geographic locations for disaster recovery, which describes where copies sit rather than for how long. The browser application maintains a searchable repository of executed contracts, so the product is designed to retain documents, with no published terms attached.

Ethical Walls and Matter Segregation

Does retrieval respect the firm’s ethical walls, or can the model read across them?

Luminance
Own model, documented

The product maintains its own documented permission model and documents it more thoroughly than any other record on this index. Between customers, isolation is architectural: a dedicated single tenant instance each, stated to ensure complete isolation with no co mingling of data. Inside a customer, the vendor publishes division level permissions administered by the customer under least privilege, role based configuration, customer configurable password and session timeout policy, and a statement that vendor staff cannot view customer documents without explicit authorisation given through the interface, with all access tracked and audited. Division level permissions are the nearest published equivalent to a wall. Recorded at the own model value rather than the positive one because no document management integration was located whose permissions retrieval could inherit at query time, and because conflicts and ethical walls are not addressed as such.

Robin AI
Not addressed

Searched the security page, the trust centre entry point, the platform pages, the published terms and the help centre entry point on 29 Aug 2026. No vendor material addresses segregation of any kind: not between customers, not between users, not between matters. Third party sources refer to sophisticated user permissions and single sign on, which is not vendor material and was not treated as evidence. No document management integration was located whose permissions retrieval could inherit. The product ingests counterparty contracts at volume and maintains a shared searchable repository, which makes the absence of any published segregation model a live question rather than an academic one.

Third Party Request and Subpoena Notice

If someone subpoenas the vendor for a firm’s data, does the firm hear about it first?

Luminance
Not addressed

Searched the published terms and conditions, the privacy policy, the security page and its FAQ, and the security standards white paper entry point on 29 Aug 2026. No clause committing to notify a customer of a government or law enforcement request for their data was located, and no transparency report was located. Noted for a future reader: the single tenant and on premises deployment options materially change what a vendor could produce in response to such a request, but the vendor does not make that argument in published material and it is not recorded as a value here.

Robin AI
Not addressed

Searched the published terms, the privacy policy, the security page and the trust centre entry point on 29 Aug 2026. No clause committing to notify a customer of a government or law enforcement request for their data was located, and no transparency report was located. This records a search across the published documents that did not surface the clause rather than a reading of every document end to end.

Primary Law Corpus Provenance

Where does the law in this product come from, and does the vendor have the right to use it?

Luminance
Not addressed

The corpus here is contract and legal document data underpinning a proprietary model rather than primary law, and it is quantified in detail without being sourced. Published: more than 220 million verified legal documents the platform has been exposed to over a decade, a curated training selection spanning roughly 3.4 million legal concepts and data points, breadth described as spanning virtually every industry including complex agreements, difficult file formats and obscure drafting styles, and a separate benchmark corpus of 189,000 manually annotated data points. What is not published is where any of it came from or on what rights basis it was assembled. Trade coverage notes that many documents in the training base were not publicly disclosed. Recorded at the weakest value because scale and character are described while the source and licence basis are not.

Robin AI
Not addressed

Two corpora are described and neither is identified. The training base is quantified as more than 4.5 million legal documents and 100 million legal clauses, with no statement of where those documents came from or on what rights basis they were assembled, which is the question this signal exists to ask and matters more for a corpus of contracts than for public case law. Separately the Word add in's Research mode is described as drawing on a curated set of trusted legal sources on the web, with none of those sources named. No licence basis, jurisdiction list or update cadence was located for either as of 29 Aug 2026.

Good Law Verification

Does the product tell you when the authority it just cited has been overruled?

Luminance
Not addressed

Searched the site, the six platform product pages, the technology page and the resources index on 29 Aug 2026. No material was located addressing whether authority carries a treatment signal or whether subsequent history is checked, and no commercial citator licence was located. Noted for context: this is a contract lifecycle product whose grounding is contract language and the customer's own precedent rather than case law, so a citator is largely outside its design.

Robin AI
Not addressed

Searched the site, the platform pages, Robin University and the help centre entry point on 29 Aug 2026. No material was located addressing whether authority carries a treatment signal or whether subsequent history is checked, and no commercial citator licence was located. Noted for context: this is a contract review product whose grounding is customer playbooks and contract language rather than case law, so a citator is largely outside its design, though the add in's Research mode does reach legal sources on the web.

Refusal and Uncertainty Behaviour

What does the product do when the answer is not in the corpus?

Luminance
Documented

The vendor documents abstention behaviour as an explicit design objective, which is the first time this signal has recorded anything above an absence on this index. Published: the proprietary model is trained to prioritise faithful extraction from source documents, and where information is not present it is designed to identify that absence rather than invent an answer, with the vendor stating this is what instils trust for legal professionals. Vendor material separately describes flagging what is absent as well as what is present as a capability advantage. Recorded at the documented value rather than the demonstrable one because no published evaluation of the abstention behaviour itself was located as of 29 Aug 2026: the ContractIQ Bench results address interpretation accuracy rather than refusal rate.

Robin AI
Not addressed

Searched the site, the platform pages, Robin University, the blog and the help centre entry point on 29 Aug 2026. No published material describes what the product does when it cannot ground an answer, and no explicit no answer path was located. Review output carries risk flags at clause level, which ranks how serious a flagged issue is rather than how confident the system is that it found one, and was not treated as a confidence signal for this purpose.

Fabricated Citation Record

Does a public court record exist involving output from this product?

Luminance
None located

No court order, opinion or disciplinary record naming this product has been located as of 29 Aug 2026. Instrument searched: the AI Hallucination Cases database maintained by Damien Charlotin, which tracks court decisions worldwide involving AI generated hallucinated content and records the AI tool implicated where it is known. Also checked published 2026 sanctions summaries and secondary sanctions trackers. The entries located name filers, and in some rows other products, rather than this one. This is a statement about the public record on the date shown and not a clearance. Note that this is a contract lifecycle product rather than a litigation or research tool, so its output is unlikely to reach a court filing as cited authority, and note that the database is weighted toward US filings while this vendor is UK founded and operates across 70 plus countries.

Robin AI
None located

No court order, opinion or disciplinary record naming this product has been located as of 29 Aug 2026. Instrument searched: the AI Hallucination Cases database maintained by Damien Charlotin, which tracks court decisions worldwide involving AI generated hallucinated content and records the AI tool implicated where it is known. Also checked published 2026 sanctions summaries and secondary sanctions trackers. The entries located name filers, and in some rows other products, rather than this one. This is a statement about the public record on the date shown and not a clearance. Note that this is a contract review product rather than a litigation or research tool, so its output is unlikely to reach a court filing as cited authority, and note that the database is weighted toward US filings while this vendor is UK founded.

Bar Guidance Alignment

Has the vendor engaged in public with the ethics opinions its buyers are bound by?

Luminance
Not addressed

Searched the site, the insights and white papers indexes, the press releases and the resources hub on 29 Aug 2026. No engagement with any named ethics opinion or professional guidance was located, including ABA Formal Opinion 512, US state bar guidance, and Solicitors Regulation Authority or Law Society guidance given the company's UK base. The vendor publishes substantial thought leadership on AI reliability, including a piece arguing that human in the loop alone is insufficient, which engages with the professional risk question in substance while naming no guidance a buyer is bound by.

Robin AI
Not addressed

Searched the site, the blog, the news index, Robin University, the guides and reports index and the webinars page on 29 Aug 2026. No engagement with any named ethics opinion or professional guidance was located, including ABA Formal Opinion 512, US state bar guidance, and Solicitors Regulation Authority or Law Society guidance given the company's London base and UK founding. The vendor publishes substantial educational content about contract workflows and legal AI adoption, which addresses practice efficiency rather than the professional responsibility obligations its buyers are bound by.

Billing and Fee Posture

Does the vendor address what happens to the bill when the work takes an hour instead of six?

Luminance
Savings claims only

Savings are claimed with nothing published on the client's side of the equation. The recurring published claim is negotiation time reduced by up to 90 percent, alongside speed framing throughout including a stated four times faster generation than generalist tools. Searched the site, the platform pages, the customers page and the resources index on 29 Aug 2026 and located no per matter record of AI assisted work intended for fee purposes, and no guidance on billing, fee or client disclosure treatment. The vendor sells to law firms as well as corporate teams, so the firm side of that question applies.

Robin AI
Savings claims only

Savings are claimed prominently with nothing published on the client's side of the equation. The headline claim across vendor material is contract review 80 percent faster, with an internal figure of over 85 percent faster from the vendor's own legal team. Searched the site, the platform and services pages, the blog and the guides and reports index on 29 Aug 2026 and located no per matter record of AI assisted work intended for fee purposes, and no guidance on billing, fee or client disclosure treatment. The vendor sells to law firms as well as in house teams, so the firm side of that question applies here.

Outside Counsel Guideline Readiness

Can a firm get this vendor through a client’s AI clause without a bespoke negotiation?

Luminance
Not addressed

Substantial security material is published openly, including a detailed security FAQ, named certifications, a named external security advisory board and a security standards white paper, all reachable without a sales conversation. But the specific artifacts this signal turns on were not located as of 29 Aug 2026: no subprocessor list, no statement of which model providers see customer content, and no client facing consent or notification pack a firm could forward to its own client. The vendor does state that owning its model limits data exposure to additional subprocessors, which is an argument about the shape of the chain rather than a disclosure of it. Recorded as not addressed because no list exists to point to.

Robin AI
Not addressed

A trust centre is published at a stable URL and is reachable without a sales conversation, which is a real access route, and the security page names Anthropic and AWS as partners. But the artifacts this signal turns on were not located as of 29 Aug 2026: no subprocessor list, no statement of which model providers see customer content, and no client facing consent or notification material a firm could forward to its own client. A partner logo is not a model provider disclosure. Recorded as not addressed rather than at the subprocessor value because no list exists to point to.

Court Disclosure Support

If a judge’s standing order requires an AI disclosure, can the product produce one?

Luminance
Not addressed

Searched the site, the platform product pages, the technology page and the security page on 29 Aug 2026. Vendor material states outputs are traceable and that all data access is tracked and audited, so elements of an access trail exist. But no per document export covering model used, sources retrieved and human verification together was located, and the model used would be difficult to state in any case given the Panel of Judges architecture routes tasks across multiple models. Noted for context: this is a contracting product rather than a litigation product, so a judicial AI disclosure order is less likely to reach its output.

Robin AI
Not addressed

Searched the site, the platform pages, the security page and Robin University on 29 Aug 2026. Third party sources describe exportable audit logs and reports, which is not vendor material and was not treated as evidence. On the vendor's own property no per document export covering model used, sources retrieved and human verification together was located, and the model used is not identifiable from published material in any case. Noted for context: this is a contracting product rather than a litigation product, so a judicial AI disclosure order is less likely to reach its output.

What neither one publishes

The questions both sides leave open

Derived from the records above rather than written, so it cannot favour either vendor. Take these into both conversations and ask each side the same question.

Axes where neither earns credit
  • Commercial Transparency
Signals neither addresses in public material
  • Third Party Request and Subpoena Notice
  • Primary Law Corpus Provenance
  • Good Law Verification
  • Bar Guidance Alignment
  • Outside Counsel Guideline Readiness
  • Court Disclosure Support

Which one fits

Choose Luminance if

  • Data isolation is the deciding control. Every Luminance customer gets a dedicated single tenant instance with complete isolation and no co mingling, documented alongside a statement that vendor staff cannot view customer documents.
  • You want measurement rather than assertion. Luminance publishes ContractIQ Bench, built on 189,000 manually annotated data points across named provision types, tested on held out documents with blind expert evaluation alongside.
  • The tool will be used well beyond legal. Luminance publishes dedicated pages for eight business functions and six industries, which is a precise account of who it is built for rather than a broad claim.

Choose Robin AI if

  • Word is the only surface your team will accept and the deployment has to be light. Robin AI's Word add in is the primary product, with Ask, Draft, Edit and Research modes separating asking from drafting so the user chooses the operation.
  • You want a searchable repository of executed contracts alongside review, rather than a full lifecycle platform you will only partly use.
  • You are willing to negotiate the training term yourself. Robin AI's published position is consent based rather than prohibitive, which is weaker as published but is a term a well advised buyer can close in contract.

In summary

Luminance

Luminance is a contract lifecycle platform covering generation, negotiation, analysis, compliance and investigation, founded in Cambridge in 2015 by mathematicians and sold across legal, compliance, procurement, sales, finance, HR and marketing functions. The AI Legal Index grades it in the top two bands on ten of fifteen capability axes. Its strongest documented control is segregation: each customer receives a dedicated single tenant instance with complete isolation and no co mingling of data, alongside published access controls stating that vendor staff cannot view customer documents. It publishes ContractIQ Bench, a proprietary benchmark built on 189,000 manually annotated data points with blind expert evaluation, and operates a Panel of Judges architecture in which multiple models analyse each clause independently and reach consensus. It publishes no pricing.

Source: AI Legal Index, 2026

Robin AI

Robin AI is a contract review, drafting and negotiation platform for in house legal teams and law firms, delivered through a Microsoft Word add in with Ask, Draft, Edit and Research modes alongside a browser application holding a searchable repository of executed contracts. The AI Legal Index grades it in the top two bands on three of fifteen capability axes, the lowest in the contract review category. Its documented review surface is real: clause level recommendations arrive as tracked changes, comments or highlighted text tied to company standards, which a lawyer accepts or rejects in place. Its published training position is the weakest the index has located, stating that customer data will not be used for model training or feature development without express consent, which is a consent gated permission rather than a prohibition.

Source: AI Legal Index, 2026

Questions buyers ask

Luminance vs Robin AI: which is stronger?

Luminance, clearly, on published evidence. The AI Legal Index places it in the top two bands on ten of fifteen capability axes against Robin AI's three, the widest gap on any comparison page in the index. The separation is concentrated in documentation: Luminance publishes a benchmark, a single tenant isolation model and detailed access controls, while Robin AI publishes real product detail but far less about accuracy, confidentiality and deployment outcomes.

Does Robin AI train on customer data?

Its published position is conditional rather than prohibitive. Robin AI's security page states that customer data will not be used for model training, fine tuning or other feature development without express consent. The AI Legal Index records this as the weakest training position it has located, because a consent gate is a permission a customer can be asked to grant rather than a commitment the vendor has accepted. Luminance by contrast documents single tenant isolation with no co mingling.

Which one keeps client data properly separated?

Luminance documents this most precisely. Each customer receives a dedicated single tenant instance with complete isolation and no co mingling of data, which exceeds the segregation level this buyer segment ordinarily requires, and access control documentation states that vendor staff cannot view customer documents. Robin AI publishes real controls but the AI Legal Index did not locate an equivalent segregation statement as of 29 August 2026.

Do either publish accuracy figures?

Luminance does. ContractIQ Bench assesses interpretation of named provision types including liability caps, termination for convenience and confidentiality obligations across 189,000 manually annotated and reviewed data points, tested on held out documents and concepts excluded from training, with blind evaluations by legal experts alongside. Robin AI publishes no accuracy figure, no hallucination rate and no evaluation framework, describing grounding only in outline.

What do Luminance and Robin AI both leave unpublished?

Neither publishes a rate, a unit of charge or a tier structure, and on both properties every commercial path ends in a demo request. Neither publishes a position on liability or recourse when the AI gets a clause wrong. Neither publishes a position on the advice line or on jurisdiction limits, which is more pointed for Luminance because it sells to procurement, sales, finance, HR and marketing teams alongside legal.

Disclosure

Two cautions, pulling in opposite directions. First, the size of the gap here reflects what each vendor publishes rather than a tested difference in output quality, and Robin AI is a smaller company than Luminance with correspondingly less published documentation. Second, and less forgiving: Robin AI's most specific published performance figure, review completed over 85 percent faster, is attributed to the vendor's own internal legal team rather than a customer, and the AI Legal Index does not treat a vendor testing itself as deployment evidence. On the training term, read the actual clause rather than this summary and get the answer in your contract. Neither vendor reviewed this page.

Neither vendor paid for inclusion, placement or a grade, and neither reviewed this page before it published. Everything above comes from public material on the dates shown. How the index grades.

Contact

Correct a record, or ask how something was graded

Every grade and every signal on this index is drawn from public sources and dated. If a record is wrong, out of date, or missing an artifact the index did not locate, send the source and it will be reviewed and the record redated. Vendors are welcome to submit documentation. Nothing on this index is for sale, including a listing, a placement, or a grade.

AI Legal Index

The AI Legal Index is an independent index that tracks changes to AI vendors in legal. It holds 61 vendors across 9 categories, each graded on the same 15 capability axes and recorded against 12 legal signals, from public sources. No vendor pays for inclusion, placement, or rating.

Index Status
Last index update
August 29, 2026
The AI Legal Index is an editorial reference. It is not a regulatory body, not a law firm, and nothing published here is legal advice or a recommendation to retain or avoid a vendor. Records are verified against published sources, bar guidance and public court records. Where a record reads not addressed, the material was not located in public sources on the date shown. See the Methodology page for evaluation standards and limitations.
© 2026 AI Legal Index
3801 N Capital of Texas Hwy, Ste E240 · Austin, TX 78746