Claude Code v2.1.280

Claude Code v2.1.280 was released on September 22, 2026.

Summary

Claude Code 2.1.280 brings Claude Opus 5.5 as your new default model with a massive 1M context window and faster processing, plus improved mouse controls in fullscreen mode for smoother navigation. Check the full release notes to see all the enhancements under the hood.

Release Context

This was the 224th Claude Code release of 2026 tracked by Havoptic.
It shipped 4 days after Claude Code v2.1.278 (September 19, 2026).

Shipped around the same time

Within 3 days of this release, other AI coding tools also shipped:

Antigravity CLI v1.2.11 (September 25, 2026)
OpenAI Codex CLI rust-v0.157.0 (September 25, 2026)
Factory Droid v0.227.0 (September 25, 2026)
Devin 2026.09.25 (September 25, 2026)
Lovable 2026.09.25 (September 25, 2026)

Compare Claude Code

Release Notes

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
Added mouse support to more lists in fullscreen mode: the wheel scrolls the /skills list, and a skill's state options in /plugin can be clicked
Added CLAUDECODEMAXMCPDESCRIPTIONLENGTH to change the 2,048-character cap on MCP tool descriptions and server instructions for every MCP server in the session
Added hook output si

View original release

Other Recent Claude Code Releases

v2.1.325 (November 13, 2026)
v2.1.323 (November 12, 2026)
v2.1.322 (November 10, 2026)
v2.1.321 (November 9, 2026)
v2.1.319 (November 6, 2026)

Upgrading from v2.1.280? See all 39 releases since.

All Claude Code releases · All AI coding tool releases on Havoptic