Model

claude-mythos-5.1

1 entry · 1 September 2026

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  1. Anthropic releases Claude Fable 5.1 and Claude Mythos 5.1

    Anthropic's launch table put Fable 5.1 ahead of its own Fable 5 and Opus 5 and OpenAI's GPT-5.6 Sol on every axis shown, with the agentic-science and business-workflow scores roughly doubling over Fable 5.

    AnthropicModels & capabilities · Benchmarks & progress