Anthropic Backtracks On Policy That 'Sabotaged' Researchers' Work

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

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.

The new model was either refusing or degrading responses for tasks like training competing LLMs, debugging AI code and optimizing neural architecture. Researchers were...

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