Anthropic· ClaudeNew model

Anthropic announces two new models: Claude Fable 5.1 (generally available) and Claude Mythos 5.1 (restricted access). They are the same model with different safeguards, offering improved performance in coding, knowledge work, and scientific research, with lower pricing and enhanced privacy and safety features.

From the source

We're introducing Claude Fable 5.1 and Claude Mythos 5.1. They're the world's most advanced models for coding and knowledge work—and their research capabilities offer an early glimpse of how AI models will contribute to scientific progress.

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