Claude Code v2.1.219 Makes Claude Opus 5 the Default Opus Model with a 1M-Token Context Window

Releasebot·high signal

Released 2026-07-24, Claude Code v2.1.219 adds `claude-opus-5` as the default Opus model with a 1M-token context window, and removes Opus 4.7 from fast mode so `/fast` now applies only to Opus 5 and Opus 4.8. Pricing is unchanged from Opus 4.8 at $5/M input and $25/M output, with fast mode at double base price for roughly 2.5x default speed. Builders on Max plans get the new default automatically — check any harness that pins a model ID.