Anthropic releases Claude Fable 5.1 with stronger long-horizon performance at lower cost
Anthropic · youtube · 2026-09-02
Anthropic has officially released Claude Fable 5.1, the latest upgrade to its most capable model class. It excels at complex, long-running tasks, with research capabilities offering an early glimpse of AI contributing to scientific progress.
- Handles multi-step work like long mathematical proofs or contracts with hundreds of cross-references
- Avoids shortcuts and fixes root causes of software issues
- Sets a new standard across Anthropic benchmarks; lower effort levels match or beat Fable 5 at much lower cost
- Available everywhere today
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