Speed up responses with fast mode changedfast-mode
Upstream edited this page at 25 Oct 2026 14:47 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 25 Oct 2026 15:07 UTC.
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7777Fast mode pricing is flat across the full 1M token context window. For the standard Opus rate to compare against, see the [Claude pricing reference](https://platform.claude.com/docs/en/about-claude/pricing).
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79The first time you enable fast mode in a conversation, you pay the full fast mode uncached input token price for the entire conversation context. The deeper into a conversation you are, the more this costs, so the charge is smallest when you enable fast mode at the start. The cost applies once per conversation, so toggling fast mode off and on again later doesn't repeat it. For the mechanism, see [how fast mode interacts with the prompt cache](https://code.claude.com/docs/en/prompt-caching.md#turning-on-fast-mode).
79The first time you enable fast mode in a conversation, you pay the full fast mode uncached input token price for the entire conversation context. The deeper into a conversation you are, the more this costs, so the charge is smallest when you enable fast mode at the start. Fast mode and standard speed keep [separate caches](https://code.claude.com/docs/en/prompt-caching.md#turning-on-fast-mode), so each later switch reads part or all of the conversation uncached again.
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8181### See where fast mode spend appears
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