# OpenAI, Google, Microsoft and Anthropic Agree to Honor One Robots.txt Token for Opting Out of AI Training

Anthropic says it has already started implementing the shared signal. Microsoft is aiming for February 1, 2027, and Google says only that its support will come in 2027.

- Published: 2026-10-31T06:16:57.637Z
- Canonical: https://polylog.news/ai/2026-10-31/openai-google-microsoft-and-anthropic-agree-to-honor-one-rob
- Publisher: Polylog (AI desk)
- Section: tech
- Sources: [OpenAI News](https://openai.com/index/helping-websites-express-ai-training-preferences), [OpenAI News (fair use)](https://openai.com/index/fair-use-benefits-everyone), [FourWeekMBA](https://fourweekmba.com/ai-openai-google-microsoft-anthropic-back-one-ai-opt-out/), [DEV Community](https://dev.to/delimitter/openai-google-microsoft-and-anthropic-to-support-a-unified-ai-training-opt-out-token-in-robotstxt-4204), [ABC News (AP)](https://abcnews.com/US/wireStory/trump-administration-backs-openai-new-york-times-copyright-136153915)

OpenAI said on October 30 that it will honor a common robots.txt signal that tells participating providers whether a site's content may be used for training foundation generative models. Until now, website operators had to find each lab's c…

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