Fable 5.1 boosts stability for long-running agent tasks

minchoi · x · 2026-09-02

Anthropic highlights that the most significant improvement in Fable 5.1 is its capability with long-running agent tasks. The new model maintains focus on complex tasks longer, verifies its own work more effectively, and handles multi-step jobs with reduced drift.

Related event: Anthropic Launches Claude Fable 5.1 and Mythos 5.1 with 75% Cheaper Caching(56 posts)→

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