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Anthropic testing new AI model, claims step-change performance

Anthropic is developing a new AI model with sharply improved performance and has begun testing it with some customers, Fortune reported on March 26. The development became known after Anthropic mistakenly exposed an unpublished document in a public data repository. A company spokesperson said the model represents a “step change” and is the best Anthropic has built. The leaked material referenced “Claude Mythos” and a higher tier called “Capybara.”