Changelog
What changed at AI vendors in legal, dated and sourced, and what changed on this index. Only product and capability changes qualify. Funding rounds, valuations, partnerships and awards are excluded, and an acquisition appears only where there is direct product impact. Every vendor entry cites a live retrieved source. Corrections and regrades publish in the same stream as everything else.
The record opens with the index
This changelog was published on the day the index launched rather than added later, so the record has no gap at the front. Entries appear as vendors are indexed and as their products change.