Fast mode removed for Claude Opus 4.7
Requests to claude-opus-4-7 with speed fast now return an error rather than falling back to standard speed. The model stays available at standard speed; migrate to Opus 5 or Opus 4.8 to keep fast mode.
- Claude API fallbacks parameter adds a default mode for recommended fallbacksBeta
- Fast mode removed for Claude Opus 4.7Deprecation
- Mid-conversation tool changes enter beta on the Claude APIBeta
- Claude Opus 5 launches with a 1M token context window at $5 / $25 per MTokGA
- Claude Opus 5 only allows disabling thinking at effort high or below
- Effort is the primary control for Claude Opus 5