Claude Code v2.1.280 adds Claude Opus 5.5 as default Opus model, fixes symlink write escapes
Anthropic
Claude Code v2.1.280 (Sep 22) adds claude-opus-5-5 as the new default Opus model — 1M context, $4/$20 per Mtok with $0.20 cache reads. Security-relevant fixes: acceptEdits/allow rules/auto mode no longer approve writes outside the tree through symlinked paths, and auto mode stops endlessly retrying actions declined by safety checks. Also adds a CLAUDE_CODE_MAX_MCP_DESCRIPTION_LENGTH env var and mouse support in fullscreen.
Why it matters
The symlink write-through fix closes a real sandbox escape, and the price drop makes Opus-class coding agents meaningfully cheaper per token.
Importance: 3/5
Priority coding agent release with a security-relevant sandbox fix