Claude Code makes Opus 5.5 the default Opus
TL;DR
- Claude Code 2.1.280, released on 22 September, adds Claude Opus 5.5 as the default Opus model, with a 1M context, $4/$20 per million tokens as the changelog puts it, and cache reads at $0.20 per million.
- Since 2.1.277 on 18 September, a project with no CLAUDE.md gets its instructions from AGENTS.md.
- Auto mode's safety classifier runs on the server for API and Enterprise users since 2.1.278, with no charge for its overhead.
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