Claude Code 2.1.280 release notes

Version

2.1.280

Released

22 September 2026

Status

Stable release

What's new in Claude Code 2.1.280

The official notes for Claude Code 2.1.280 list 114 changes: 3 new features, 52 fixes, 1 performance improvement, 1 security change and 57 other changes.

• 3 new features
• 52 fixes
• 1 performance improvement
• 1 security change
• 57 other changes

Highlights

• security change Fixed background plugin marketplace auto-update ignoring git credential helpers, so private-repo marketplaces were re-cloned every run or never updated
• new feature Added mouse support to more lists in fullscreen mode: the wheel scrolls the /skills list, and a skill's state options…
• new feature Added CLAUDE_CODE_MAX_MCP_DESCRIPTION_LENGTH to change the 2,048-character cap on MCP tool descriptions and server instructions for every MCP server in the…
• new feature Added hook output sizes and the number of oversized outputs saved to a file to the hook_execution_complete OpenTelemetry event
• performance improvement Added Claude Opus 5.5 (claude-opus-5-5), now the default Opus model — 1M context, $4/$20 per Mtok with $0.20/Mtok cache reads

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 2.1.280)

All Claude Code release notes · All releases

Also tracked: Claude news · Claude resets · Claude Code release notes · Blog