New features / v2.1.280
Add Claude Opus 5.5 as default Opus
CHANGELOG · original
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 Open official changelog ↗ Related documentation
Background on the feature; see the changelog above for this specific change.