Claude Code 2.1.21 release notes

Version

2.1.21

Released

28 January 2026

Status

Stable release

What's new in Claude Code 2.1.21

The official notes for Claude Code 2.1.21 list 10 changes: 1 new feature, 5 fixes and 4 other changes.

• 1 new feature
• 5 fixes
• 4 other changes

Highlights

• new feature Added support for full-width (zenkaku) number input from Japanese IME in option selection prompts
• fix Fixed shell completion cache files being truncated on exit
• fix Fixed API errors when resuming sessions that were interrupted during tool execution
• fix Fixed auto-compact triggering too early on models with large output token limits
• fix Fixed task IDs potentially being reused after deletion

Our short summary: changes are counted and classified automatically from the official notes, and highlights are shortened. The complete, authoritative list is in the official release notes on GitHub.

Full release notes on GitHub (Claude Code 2.1.21)

All Claude Code release notes · All releases

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