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Claude Fable 5.1 and Mythos 5.1: The System Card

This story is from 2026-09-04. It is preserved in the archive; the latest stories are on the live feed.

At the time of its release Claude Fable 5.1 was, by a healthy margin, the most capable publicly available AI model in the world.

Read the full story at Don't Worry About the Vase (Zvi) ↗

Timeline · 2 reports

  1. 2026-09-05 19:39 · Don't Worry About the Vase (Zvi)
    Claude Mythos 5.1 and Fable 5.1: Capabilities
  2. 2026-09-04 16:03 · Don't Worry About the Vase (Zvi)
    Claude Fable 5.1 and Mythos 5.1: The System Card

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  1. Claude, Anthropic’s AI model, is helping to develop the next version of itself — Fast Company AI
  2. AI skills — r/AI_Agents
  3. we made a 27b model for creative writing. performs as good as claude fable 5, at a 40x cheaper price, open weights. — r/GeminiAI
  4. Anthropic selects Accenture as first embedded evaluator to help implement Amodei's slowdown proposal — CNBC Technology
  5. Bolt Adds DeepSeek V4.1 Flash at 10x Cheaper Than V4 Pro — AlphaSignal
  6. OpenAI ‘ethically hacked’ with help of Anthropic’s Claude chatbot — The Guardian AI
  7. How To Use Ai and create those videos — r/aivideo
  8. Hitting usage limits on Codex and Claude Code.. which paid plans or setups give the most usable capacity for the money? — r/ChatGPTCoding

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