Anthropic is walking back a policy in Claude Fable 5 that would have covertly degraded the model's performance when it detected users were doing frontier AI research.

The move would have invisibly sabotaged researchers trying to use Claude to develop competing AI models without telling them it was happening.

The backlash from the AI research community was fierce. Dean Ball of the Foundation for American Innovation called it "shockingly hostile."

Critics argued the policy could have created a future where only a handful of leading AI labs could perform advanced AI research, while open-source developers using Claude's coding agent would have been silently undermined.

Anthropic reversed course. "We're changing Fable 5's safeguards for frontier LLM development to make them visible. We made the wrong tradeoff and we apologize for not getting the balance right."

Going forward, if Claude suspects a user is trying to build a competing model, it will either refuse the request or reroute to a less capable model and tell the user it's doing so.

Anthropic already bans using Claude to train competing AI models in its terms of service and has revoked access from competitors before.

The controversy was specifically about doing it covertly, degrading output quality without disclosure rather than openly refusing.

Microsoft is restricting employee use of Anthropic's Claude Fable 5 over data retention concerns.

Anthropic's new policy stores user prompts and outputs for 30 days. Microsoft's legal team flagged the change and is evaluating the terms before allowing broader access.

The restriction came just one day after Fable 5 launched publicly.

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Anthropic CEO Dario Amodei published a major policy essay today titled "Policy on the AI Exponential," arguing that AI is advancing far faster than the policy apparatus was built to handle.

He says if scaling laws continue for even another year or two, we are likely to reach what he calls "a country of geniuses in a datacenter."

Amodei frames the gap as existential. "In the several years that it can take Congress to act, AI can go from an amusing toy to the full country of geniuses."

He says Claude Mythos Preview "proves beyond doubt that AI models are now tools of global and national strategic consequence," and warns that biological risks and serious AI autonomy risks may follow.

The essay covers five policy areas that Amodei says need to be reimagined for an AI world: regulation and public safety, macroeconomics and tax policy, scientific innovation, the balance of power between state and society, and geopolitics.

Alongside the essay, Anthropic is releasing a legislative proposal for frontier model testing and a policy framework for AI-driven job displacement, both of which the company says it intends to financially back.

Amodei says transparency legislation was the right first step, but "now the risks are clearly here" and it is time to go beyond transparency into targeted regulation.

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