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OpenAI, Google, Microsoft and Anthropic Say They Will Adopt One Signal for Opting Out of AI Scraping

The Verge reports that four AI companies say they will adopt a shared signal placed in a site's robots.txt file. Site owners and publishers would no longer need to tell each company separately whether their content may be scraped to train AI.

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OpenAI, Google, Microsoft and Anthropic Say They Will Adopt One Signal for Opting Out of AI Scraping
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What happened

According to The Verge on October 30, 2026, OpenAI, Google, Microsoft and Anthropic say they will adopt a new standard that lets publishers opt out of AI scraping, meaning AI companies' automated programs (crawlers) would not collect a site's content. The Verge notes that Search Engine Roundtable reported the news earlier.

The Verge says publishers can use it to apply their AI training preferences, that is, whether content may be used to train AI models, to several AI companies at once rather than setting them for each one. Currently, sites must state such preferences to each AI company separately.

How the "policy token" works

The "policy token" can be understood as a shared marker a website leaves for AI crawlers. The Verge reports that the signal was proposed at the internet standards body the Internet Engineering Task Force (IETF) by Kevin Kelley, a technical lead for standards at Anthropic.

As The Verge explains, the signal goes inside a site's robots.txt file. This file has long been used to indicate which web crawlers may or may not scrape a site, whether for search indexing, archiving or AI training.

The Verge says OpenAI, Google, Microsoft and Anthropic all state that, when they encounter this shared signal, they will restrict their AI crawlers' access to that site.

Company timelines and differences

Adoption progress compiled from The Verge's report
CompanyStatus or approach as reported by The Verge
AnthropicHas adopted the signal
GooglePlans to support it next year
MicrosoftPlans to support it next year; will also offer finer-grained controls to opt out of AI training or AI grounding (pointing an AI model to a verified source of information)
OpenAISays it will implement it in the "coming months"

The Verge notes that Microsoft will offer finer-grained controls that let publishers opt out of AI training or AI grounding. The Verge describes AI grounding as pointing an AI model to a verified source of information to reduce "hallucinations" (AI producing false content). Microsoft also says sites will still appear in Bing search results regardless of their preferences.

What it means for site owners

The Verge notes that publishers face pressure from AI crawlers that keep scraping large amounts of site content for use in AI models. As described, the new signal lets site administrators apply their AI training preferences to several companies at once, without setting them for each one separately.

The Verge also mentions other approaches against unauthorized scraping, such as the Really Simple Licensing (RSL) standard, which lets publishers charge visiting crawlers, and Cloudflare, which blocks AI crawlers by default. The new signal is a different option: the site states its preference, and the AI companies say they will comply.

FAQ

What is this new standard?

According to The Verge, it is a shared "policy token" signal placed in robots.txt, which publishers can use to state their AI training preferences to several AI companies at once.

Who proposed the signal?

The Verge says it was proposed at the IETF by Kevin Kelley, a technical lead for standards at Anthropic.

Which companies already support it?

According to The Verge, Anthropic has adopted it; Google and Microsoft plan to support it next year; OpenAI says it will implement it in the "coming months."

After opting out, will a site still appear in search results?

The Verge reports that Microsoft says sites will still appear in Bing search results regardless of their preferences. The report does not explain other companies' approaches.

How does Microsoft's approach differ?

According to The Verge, Microsoft will offer finer-grained controls that let publishers opt out of AI training or AI grounding.

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