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Claude Fable 5.2: Anthropic’s model for the hardest technical work, now cheaper

Claude Fable 5.2, released by Anthropic on November 9, 2026, is its model for the most ambitious technical work. Anthropic says it generates output up to 30% faster than Fable 5.1, communicates more clearly, and costs less to run than the previous version. It is available on all Claude platforms, including the API.

Last checked · Announced · By Mishal Brands Editorial

Checked Nov 10, 2026. Everything below is what the company reports in its own announcement, linked at the bottom: Anthropic, “Claude Fable 5.2 and Mythos 5.2” (Nov 9, 2026). We have not tested it ourselves, and figures are the company’s own unless we say otherwise.

What it does and why it matters

Anthropic positions Fable for open-ended technical work and recommends most people start with Claude Opus 5.5 for daily coding and knowledge tasks, moving up to Fable only when needed (Anthropic, Nov 9, 2026).

Fable and Mythos are the same underlying model. Fable carries cybersecurity and biology safeguards so it can be offered to all users; Mythos is for vetted organizations through Anthropic’s verification programs.

Who it is for

  • Engineering teams running big migrations or long multi-agent jobs.
  • Teams that want one model to coordinate faster models on a large task.
  • Not for security testing: Anthropic says Fable’s safeguards block most cybersecurity tasks.

Standout features

  • Up to 30% faster output than Fable 5.1.
  • Strong on merged code: on FrontierCode 2.0, Anthropic reports 45.3% at High effort, about level with Opus 5.5’s best (45.5%) for roughly half the cost per task, and 49.1% at Xhigh effort.
  • Fewer tokens at the default Medium effort than Fable 5.1.
  • Optional fast mode that speeds up generation by up to 2.5 times.

How to start

  1. Start with Claude Opus 5.5 for normal work, as Anthropic recommends.
  2. Switch to Fable 5.2 for the task your current model keeps failing.
  3. Developers: call claude-fable-5-2 on the Claude Platform and set effort to High for hard jobs.
  4. Watch costs on long runs; fast mode doubles the token price.

Alternatives

  • Claude (Opus, Sonnet and Haiku) for everyday work.
  • Gemini 4 Carbon, Google’s frontier model, now generally available.
  • ChatGPT for general AI assistance.

The catches

  • Benchmarks are Anthropic’s, with safeguards on and at the highest available effort unless noted.

Frequently asked questions

What is Claude Fable 5.2?

Anthropic’s upgraded model for daunting technical challenges, released November 9, 2026, with improvements in coding, reasoning and vision.

What is the difference between Fable and Mythos?

Anthropic says they are the same underlying model. Fable has cybersecurity and biology safeguards and is available to everyone; Mythos is available to approved organizations through verification programs.

How much does Claude Fable 5.2 cost?

Anthropic lists $8 per million input tokens and $40 per million output tokens, and $16 and $80 in fast mode.

Pricing for Claude Fable 5.2

Anthropic lists Fable 5.2 at $8 per million input tokens and $40 per million output tokens, a lower price than before. Fast mode costs $16 per million input tokens and $80 per million output tokens.

Plan facts from our library, worded as each vendor reports them:

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Sources (checked Nov 10, 2026)

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