Claude Code 2.1.280 makes Opus 5.5 the default Opus model
Read original source →code.claude.comClaude Opus 5.5 (claude-opus-5-5) ships with 1M context and pricing of $4/$20 per Mtok, with cache reads at $0.20/Mtok. The release carries 114 CLI changes, including a new CLAUDE_CODE_MAX_MCP_DESCRIPTION_LENGTH setting for the 2,048-character MCP tool description cap.
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