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Anthropic

Is Claude Fable 5.1 out? Yes, since September 1, 2026

Yes. Claude Fable 5.1 was released on September 1, 2026.

A browser notification for each confirmed release in this family. No account or email.

Have you used it? Claude Fable 5.1

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Lab
Anthropic
Family
Claude
Release date
Source
Anthropic · Claude Fable 5.1 and Mythos 5.1

What changed

  • context 1M tokens · Context window of Claude Fable 5.1. Claude Opus 5 is the previous model of the same tier, but the gap is beyond what a percentage explains.
  • price +100 % · Prompt price compared with Claude Opus 5, same tier in this family. Went from $5.00 / MTok to $10.00 / MTok. Lower is better.

About Claude Fable 5.1

Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual...

Next Claude model to watch

Questions

When was Claude Fable 5.1 released?
Claude Fable 5.1 was released on September 1, 2026.
Who makes Claude Fable 5.1?
Claude Fable 5.1 is made by Anthropic.
What comes after Claude Fable 5.1?
Claude Opus 5.5, released on September 22, 2026.