Fast mode for Claude Opus 4.7 is now available in research preview on the API and in Claude Code.

Anthropic has released a fast mode for Claude Opus 4.7, now available in research preview for both the API and Claude Code, offering improved performance for compatible workloads. This feature allows developers and users to access faster inference speeds while using the latest Opus model. The fast mode is currently in experimental/preview status and subject to changes as Anthropic gathers feedback.

Source: Boris Cherny (X) | 2026-05-12