Anthropic retires Claude Opus 4.8 fast mode
Anthropic will remove fast mode for Claude Opus 4.8 on November 30, 2026. Requests using fast mode after removal will return an error; Anthropic says to migrate to Claude Opus 5.5 to continue using it.
- Context
- 1M
- Max output
- 128K
- Input price
- $5.00
- Knowledge cutoff
- Jan 2026
Claude Developer Platform release notes ↗
Source: Claude Developer Platform release notes, checked Oct 31, 2026. Summarized from the provider’s announcement.