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Gaius-Lex

Gaius-Lex is an AI research and drafting agent for lawyers and tax advisers covering Polish, Czech, Austrian and German law. It is run by FLATHUB sp. z o.o. of Krakow, the contracting party in the terms of service, and backed by Digital Ocean Ventures, which calls it its first investment. It retrieves from a daily updated database of statutes, case law and tax interpretations, naming the Polish KRS company registry, the Eureka jurisprudence database, and Constitutional Tribunal and Supreme Court rulings, along with the main primary sources for the other three jurisdictions.

Answers come with a footnote and a link to the authority, and case signatures are checked for existence against the database. The platform is sold as SaaS, hybrid or on premise. The site runs across three domains: gaius-lex.com in English, gaius-lex.pl in Polish and gaius-lex.de in German. The Polish site carries the application, the contact address and the binding terms of service, which are governed by Polish law.

Compared with

Gaius-Lex, head to head

Side by side on the same 15 capability axes and 12 legal signals: where the two part company, and what neither one publishes.

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Capability grades

All 15 axes, graded from public sources on the date shown. Hover a grade to see what the letter means on that axis.

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

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.

The agent is the product. The terms of service define the paid services as putting questions to a language model and issuing instructions to it, and the metered unit of charge, called a Lex, is consumed per AI action. There is a classic text search alongside it, described in the terms as a separate service, but every function the product is sold on runs through the model.

Source: Vendor Published
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.

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.

Grounding is documented in detail. Every thesis carries a footnote and a link to the regulation or ruling, case signatures are checked for existence against the database, and the vendor says that where confirmation is missing the system flags it rather than asserting. No accuracy rate, hallucination rate or published evaluation exists. The record also holds a contradiction. The marketing sites claim the product never guesses and produces no hallucinations.

The terms of service say the AI does not always answer in line with reality, name the problem as hallucinating, and warn that it may materially affect the result. The contractual disclosure is candid; the absolute marketing claim is not evidence.

Source: Vendor Published
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.

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.

The product is marketed at the high autonomy end, as an autonomous trainee that plans its own research and delivers drafts, and the vendor sets against that a contractual statement that generated content is never self standing, is to be treated only as a suggested formulation, and requires the user's own work at the concept, creation and review stages. A contractual constraint is materially stronger than a marketing assurance of human review, which is why this is a high B. It stays at B because it is a general statement rather than one attached to a named plan or mode stating what that tier's output may not be used for.

Source: Vendor Published
DD on Operational and Outcome EvidenceNo production evidence located. Announcements, funding and launch coverage are not deployment evidence.

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.

No named customer, no case study and no production figure of any kind is published by the vendor. There is substantial Polish trade press coverage and an investor blog post referencing dozens of early clients, but both are third party and the investor is not a neutral source. The product is plainly operating, with a live checkout, an application and four jurisdictions, and operating is not outcome evidence.

Source: Operator Verified
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.

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.

Real controls exist: encryption in transit and at rest, and automatic or manual anonymization for each document. A contractual term bars users from submitting third party personal data at all unless a data processing agreement has been signed, and requires every document to be anonymized until then. Two gaps remain. Privilege, work product and professional secrecy are not treated anywhere as duties the vendor owes, and no segregation by matter is described.

And the agreement conflicts with the marketing on confidentiality: the terms reserve a right to use query history to develop the vendor's AI algorithms, while the English site says client files, cases and analyses are never used to train any model by the vendor or any third party.

Source: Vendor Published
BB on UPL and Professional Responsibility PostureA real position is published on advice versus tooling, short of full treatment: commonly a disclaimer without the supervision and competence dimension, or silence on jurisdiction limits.

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. Where the advice line is not the duty a product raises, the axis is read through the nearest professional duty it does raise: judicial conduct rules and the reviewing duty for products sold only to courts, and the duty to bill for time actually spent for products that draft time entries.

The posture is contractual rather than marketing. The terms say the provider does not supply legal assistance, that an answer is not legal assistance, and that a user taking any legal step should consult someone professionally qualified to give it. Eligibility is limited to entrepreneurs contracting directly in connection with their business or profession. Consumers are routed to a separate, individually negotiated arrangement through a dedicated address.

A separate student agreement grants an educational license that expressly bars commercial, paid or professional use, including during a law firm internship. No bar or ethics guidance is named, and the terms address Polish law while the product is now marketed across four jurisdictions, so the jurisdictional limits of the posture are not stated.

Source: Vendor Published
DD on AI Governance and Bias DisclosureNo governance position published for a system whose output affects legal outcomes.

AI Governance and Bias Disclosure

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

No governance owner, testing before release, evaluation practice or statement about output variation across matter types, jurisdictions or parties is published. The terms do disclose that the model is developed on limited data sets whose content the provider does not answer for, which is a limitation disclosure rather than governance.

Source: Operator Verified
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.

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.

The subprocessor position is the strongest element. The privacy policy names the providers whose engines power the AI (OpenAI, OctoML, Gladia, Anthropic and RunPod) and says each processes under a data processing agreement using European Commission standard contractual clauses. The list has been maintained, since an earlier published version named only two of the five. Encryption at rest and in transit, anonymization for each document, account deletion within 24 hours of a request, and an export of stored query history when an account is blocked are all published. No retention period is stated for documents or prompts, and no incident response practice is described.

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

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.

The position is published, specific and entirely negative, which is worth more to a buyer than silence and is why this sits above D. The terms exclude the provider's liability for the quality of AI output and set out six stated reasons, including that the system depends on third party providers running the AI engine, that the model is built on limited data sets, and that it may hallucinate. No indemnity, no liability cap, no carve out and no insurance position is published.

The terms also record that an individually negotiated agreement takes precedence where it conflicts, so an enterprise buyer may be able to negotiate something the published document does not offer.

Source: Vendor Published
DD on Practice Systems Integration DepthNo integration into practice systems located, or the product stands alone and requires work to move to it.

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.

No document management integration is published, and iManage, NetDocuments, SharePoint and OneDrive appear nowhere. There is no Word or Outlook add-in. The product is a browser application, defined in the terms as software run in a web browser, into which a user uploads files in listed formats. Documents live in the vendor's own store rather than the firm's.

Source: Operator Verified
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, or the tenancy model is stated on its own with no residency detail published.

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.

Deployment options are strong: SaaS, hybrid and on premise are all published as buyer choices, and running locally is the core pitch. Residency is where it comes apart. The English site says every uploaded document is processed only on servers in the European Economic Area and never routed outside it. The privacy policy names US incorporated providers among those receiving user queries, and an earlier version of the same policy expressly contemplated transfers outside the European Economic Area under standard contractual clauses.

The on premise product may resolve this, since nothing leaves the customer's systems, but no page says the residency claim applies to one deployment shape only.

Source: Vendor Published
DD on Security Certifications and Trust CenterNo independent security attestation located.

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.

No SOC 2, ISO 27001, penetration test summary, trust portal or attestation of any kind is claimed or reachable, and there is no self service request route. The European Union funding badge in the footer is a grant mark, not a certification.

Source: Operator Verified
BB on Model Supply Chain DisclosureThe supply chain is partly disclosed: providers named without change notification, or architecture described without the providers.

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.

The disclosure sits in the privacy policy rather than in marketing. The vendor names five providers supplying the engines behind its AI (OpenAI, OctoML, Gladia, Anthropic and RunPod) with standard contractual clauses as the transfer basis, and comparing published versions shows the list being kept up as the stack changed. Two gaps remain. No specific model or version is named, only providers. And the disclosure conflicts with the marketing, which presents the product as running locally deployed small language models without connecting to public cloud AI services; naming OpenAI and Anthropic as recipients of user queries describes a different architecture. No commitment to notify customers when the list changes is published.

Source: Vendor Published
AA on Commercial TransparencyA buyer can learn what this costs without entering a sales process: published rates, the unit being charged, and what implementation adds.

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.

A buyer can price this without speaking to anyone. Two plans are published with rates, Gaius Standard at 159 euro per month net and Gaius Pro from 2,150 euro per month net, each with a live checkout, and a seven day full trial requires no card. The unit of charge is published and defined at length in the terms: a Lex is an internal accounting unit consumed per action, plans carry a stated Lex allowance, a consumption table sets the cost of each action, and the rules on top ups, carry over, freezing on non renewal and expiry after 90 days are all written down.

Team plans pool Lexes across seats with each additional seat priced. Billing periods of 30, 90 and 365 days are offered and price changes require 14 days notice with a right to cancel. A free tier and a student plan sit below the paid rate.

Source: Vendor Published
BB on Firm and Practice CoverageSegment and practice coverage is described with substance, short of the boundaries: what is supported is clear, what is not is left open.

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.

Eight buyer segments are named, each with a stated use: law firms, solo practitioners, tax advisers, courts, public administration, financial institutions, corporations, and small and medium businesses, with a student plan alongside. Jurisdictional coverage is specific, naming the primary sources for Poland, the Czech Republic, Germany and Austria. Firm size is addressed only through the two plan tiers and a team seat model, and there is no breakdown by practice area beyond tax being called out separately.

Source: Vendor Published
Sources on file

2 public documents

The public pages on file for Gaius-Lex, with the recorded signals each one supports and the date it was last read. Open any of them and check the reading against the record.

Change log

Product updates

Oct 12, 2026Integration / interoperabilityPartially Verified

Gaius-Lex documented a SharePoint connector on 12 October, under Settings and Integrations, with screenshots taken that day. A user signs in with a Microsoft work account, with admin consent where the tenant requires it, and connects either a whole resource or chosen sites and folders so the documents can be used inside Gaius-Lex without uploading them by hand. The guide does not say when the connector first shipped.

Bears on: Practice Systems Integration DepthSource

Legal Signals

What each signal means

A signal records what public sources say on the date shown. It is not a grade and it is not a recommendation. Where a signal reads Not addressed, it means the index did not locate the material in public sources on that date, which is a statement about disclosure rather than about the product.

Confidentiality and Privilege

Client Data in Training

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

Permitted, in the contract

The published agreement expressly reserves a right to train on customer content, with no opt out located. Any de identification, anonymization or aggregation qualifier is recorded in the summary.

The terms of service in force from 12 November 2025 say the provider may use the history of queries a user submits to the AI to develop the AI algorithms through which it supplies the services. No opt out was located. The vendor attaches a qualifier: the clause says query histories will not contain third party personal data disclosed by the user, which the same agreement supports with a bar on submitting such data without a signed data processing agreement.

Separately, the English marketing site says client files, cases and analyses are never used to train any AI model by the vendor or any third party. The grant is in the agreement and the denial is in marketing; both are recorded and neither settles the question.

Source: Vendor Publisheddo rozwijania algorytmow sztucznej inteligencjiAs of Sep 15, 2026Evidence

Prompt and Output Retention

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

Disclosed without a period

Retention is acknowledged in public materials with no stated period.

Retention of query history is acknowledged in several places in the terms without any period being stated. The provider undertakes to let a user export content stored under the services, named as query history, before an account is removed; an account inactive for over a year with no subscription may be deleted; and account deletion on request is completed within 24 hours, extending to 14 days where there are technical obstacles.

No retention window is published for prompts, outputs or uploaded documents while an account is live, and no zero retention setting is described.

Source: Vendor Publishedeksportowac swoje tresci zachowane w ramach swiadczonych UslugAs of Sep 15, 2026Evidence

Ethical Walls and Matter Segregation

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

Not addressed

No located public material addresses walls or matter level segregation.

No located material addresses ethical walls or matter level segregation. The question arrives differently here than for a document management integrated product, because this product has no such integration: documents are uploaded into the vendor's own store rather than retrieved from the firm's system, so there is no existing access model for it to inherit. Team plans are described in the terms as pooling a shared allowance across seats under an administrator, with no per matter or per user access boundary described. Checked 15 September 2026 across both estates, the terms of service and the privacy policy.

Source: Operator VerifiedAs of Sep 15, 2026

Third Party Request and Subpoena Notice

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

Not addressed

No located term or policy addresses third party requests for customer data.

No commitment to notify a customer of a subpoena, law enforcement demand or other third party request for its data was located, and no discretion over notice is reserved either. The terms of service were reviewed in full and contain no clause on the subject. No transparency report is published. Checked 15 September 2026.

Source: Operator VerifiedAs of Sep 15, 2026
Accuracy and Authority

Primary Law Corpus Provenance

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

Sources named, basis unstated

Sources are identified without stating the license or rights basis.

Sources are identified specifically. Poland is described as statutes, common and administrative court rulings, tax interpretations, the KRS company registry, the Eureka jurisprudence database, and Constitutional Tribunal and Supreme Court rulings. The Czech Republic covers the Civil Code by act number plus Constitutional and Supreme Court rulings; Germany covers BGB, HGB and BGH, BAG and BVerwG case law; Austria covers ABGB, UGB, AVG and Oberster Gerichtshof rulings.

A daily update cycle is stated. No license or rights basis is stated for any of it, though the terms say results depend on data gathered from publicly accessible websites that publish rulings, which points to a public source basis without asserting one.

Source: Vendor PublishedAs of Sep 15, 2026

Good Law Verification

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

Not addressed

No located public material addresses whether authority is checked for subsequent history.

The product checks that a cited ruling exists, by matching case signatures and documents against its database, and compares lines of case law to identify a dominant judicial position. Neither is a check on how the authority has been treated since. No located material says whether returned authority is tested for later history, and no citator is named. The distinction matters here because existence checking is marketed prominently, and a reader could take it for a check on whether the law is still good.

Source: Vendor PublishedAs of Sep 15, 2026

Refusal and Uncertainty Behavior

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

Documented

The vendor describes refusal or abstention behavior in public materials.

The vendor documents an explicit abstention behavior: the system checks whether a signature or document exists in the database and, where confirmation is absent, flags that rather than presenting the answer as certain. The vendor's own phrasing is that it does not pretend to be sure. This is a described behavior with a stated check rather than a disclaimer, which is why it records as documented. It is not demonstrable, because no published evaluation or worked example of the refusal path was located.

Source: Vendor PublishedAs of Sep 15, 2026

Fabricated Citation Record

Does a public court record exist addressing fabricated or hallucinated legal citations in output from this product?

None located

No court order, opinion or disciplinary record addressing fabricated or hallucinated legal citations produced by this product has been located as of the date shown. This is a statement about the public record on that one subject, not a finding about the product, and this signal is not a litigation history.

No court order, opinion or disciplinary record addressing fabricated legal citations in this product's output was located as of 15 September 2026. The tracker searched was the AI Hallucination Cases database maintained by Damien Charlotin, alongside a general search of the public record. This is a statement about the public record on that one subject as of that date, not a finding about the product or a litigation history.

Source: Bar Guidance or Court RecordAs of Sep 15, 2026Evidence
Professional Responsibility

Bar Guidance Alignment

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

Generic reference

Public materials refer to professional responsibility in general terms without naming guidance.

The terms of service engage with professional responsibility in general terms without naming any guidance. They state that the services are intended to support persons professionally providing legal assistance who have the knowledge and experience to use the results properly, that the services in no way replace legal assistance provided by professionals, and that a user taking any legal step should consult someone professionally qualified and holding the appropriate professional title.

No bar or ethics opinion is named, in Poland or in any of the other three jurisdictions the product covers, and no material is published that a firm could hand to its own risk committee.

Source: Vendor PublishedAs of Sep 15, 2026

Billing and Fee Posture

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

Savings claims only

Public materials claim time savings without addressing billing or disclosure, and the product sits inside a fee relationship between a lawyer and a client where those savings would change the bill.

The vendor sells compressed time, offering tax interpretations and dominant lines of case law in minutes and a complete argument built in minutes, to law firms and solo practitioners who bill clients for that work. No located material addresses billing treatment, fee disclosure, or what a firm should tell a client about AI assisted work. The Lex consumption table gives a firm a precise record of what each action cost it in units, but that is internal metering priced to the firm, not a record of AI assisted work framed for a client bill.

Source: Vendor PublishedAs of Sep 15, 2026

Outside Counsel Guideline Readiness

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

Subprocessors listed

A current subprocessor or model provider list is published.

A current model provider list is published in the privacy policy, naming OpenAI, OctoML, Gladia, Anthropic and RunPod as the providers of the engines powering the AI, and stating that each processes under a data processing agreement incorporating European Commission approved standard contractual clauses. That is the artifact a firm needs when a client's outside counsel guidelines ask which model providers see its content, and it is reachable without an agreement in place.

It falls short of a disclosure pack because no client facing consent or notification material is published alongside it, and the list names providers rather than models.

Source: Vendor PublishedAs of Sep 15, 2026

Court Disclosure Support

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

Not addressed

No located public material addresses court disclosure or verification certification.

No located material addresses court disclosure obligations, judicial standing orders or verification certification, and no export covering model used, sources retrieved and human verification is described. A full audit trail is claimed for the judiciary segment, but it is described as organizing case material for a judge rather than as a record of AI assistance a filer could disclose. Checked 15 September 2026 across both estates, the terms of service and the privacy policy.

Source: Operator VerifiedAs of Sep 15, 2026
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 462 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
October 21, 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.
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