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claude_code_releases · Sep 1, 2026 · release

Source brief

claude-code v2.1.257

github.comSep 1, 2026
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Release highlights

  • Added Claude Fable 5.1 ( claude-fable-5-1 ), now the default Fable model — 1M context, $10/$50 per Mtok with $0.25/Mtok cache reads
  • Added "Time format" ( timeFormat ) and timeZone settings: 12-hour, 24-hour, 24-hour UTC, or a strftime pattern for the turn-end clock and transcript-view tim...
  • Added a Containment Escape rule to auto mode so cloud metadata-credential fetches, egress evasion, and cross-tenant reach are no longer auto-approved unless...
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