Anthropic's Fable and Mythos 5.1 Benchmark Scores Leak

Reddit posts reveal benchmark charts for Anthropic's Claude Fable 5.1 and Mythos 5.1, shared in part by engineer Felix Rieseberg. The new models show improvements over predecessors, though some view the gains as incremental.

2026-09-02 ~ 2026-09-02 · 2 related posts

• Benchmarks for Claude Fable 5.1 and Claude Mythos 5.1 leaked — minxio_ · 2026-09-02
• New Benchmarks for Anthropic's Fable 5.1 Show Incremental Gains — Justwalkingthru3 · 2026-09-02