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Claude Fable 5.1 · default Fable, Copilot GA

By NO FEEDEdition date 2 September 2026

1M context, $10/$50, $0.25 cache reads. Default Fable in Claude Code 2.1.257+; Copilot GA with retention-on-by-default and optional enterprise ZDR through year-end.¹⁴⁵

Relevant to: Long-running agent work on Claude Code, API, or Copilot

What the verdict meansAvailable, works, worth your time today.

Sources

github — claude-code v2.1.257 · read 2 September 2026
GitHub Changelog — Fable 5.1 in Copilot · read 2 September 2026
Anthropic — platform release notes 1 Sep 2026 · read 2 September 2026

Originally part of the 2 September 2026 edition.

Sources

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