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Anthropic backtracks on policy that 'sabotaged' researchers' work
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Anthropic backtracks on policy that 'sabotaged' researchers' work

Engadget · Jun 11, 2026, 9:00 AM · Also reported by 3 other sources

Key takeaways

  • It wasn't a good look for a company that prides itself on working closely with the academic community.
  • Primakov/Shutterstock Anthropic is walking back a policy that discreetly hamstrung researchers using its new Claude Fable 5 LLM to create competing AI models, the company told Wired.
  • When Anthropic released Claude Fable 5, a new model based on its powerful Mythos system, researchers noted something odd.

It wasn't a good look for a company that prides itself on working closely with the academic community.

Primakov/Shutterstock Anthropic is walking back a policy that discreetly hamstrung researchers using its new Claude Fable 5 LLM to create competing AI models, the company told Wired. "We're changing Fable 5's safeguards for frontier LLM development to make them visible," the company said in a statement. "We made the wrong tradeoff and we apologize for not getting the balance right."

When Anthropic released Claude Fable 5, a new model based on its powerful Mythos system, researchers noted something odd. They found that that Fable 5 would quietly reroute requests to a lesser model when asked to perform certain actions. Moreover, that restriction wasn't disclosed in the model's documentation.

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