Fast Mode

Fast mode is a high-speed configuration for Claude Opus 4.6, making the model 2.5x faster at a higher cost per token.

/fast (research preview) — high-speed mode for Opus 4.6. Billed as extra usage at a premium rate. Separate rate limits apply. Fast mode requires extra usage billing — /extra-usage to enable.

Learn more: https://code.claude.com/docs/en/fast-mode

Related: Models, Extra Usage, Model Settings