Dataset

robots.txt Common AI Opt-Out Vendor Adoption Timeline Dataset (October 2026)

Summarizes adoption status and timelines of OpenAI, Google, Microsoft, Anthropic and Meta for the common robots.txt AI-training opt-out signal announced October 30, 2026.

One-sentence summary

This dataset summarizes vendor adoption of the common robots.txt AI-training opt-out signal announced October 30, 2026: Anthropic already adopted, Google and Microsoft plan 2027, OpenAI in coming months, and Meta supports but has not committed.

Notes ​

  • The signal is a common policy label in robots.txt, discussed in the IETF AI-preferences working group.
  • Announced October 30, 2026; timing per reports including The Verge.
  • Each vendor's existing controls remain.

Core Data ​

modelAdoption statusExpectedNote
AnthropicAdoptedLiveFirst to ship
GooglePlans to support2027Keeps Google-Extended
MicrosoftPlans to support2027Adds training/anchoring opt-outs
OpenAIVoluntary joinComing monthsNo firm date
MetaSupports the ideaNot committedPush commercial terms to Nov 20

Field Notes ​

  • Google-Extended: Google's crawler control since 2023; allowed content may appear in Gemini answers.
  • Microsoft granularity: Sites can opt out of training and anchoring separately without affecting Bing indexing.
  • IETF process: Remaining AI-preference vocabulary is still under discussion.

Sources ​