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Anthropic

Claude Opus 5 (Fast)

Claude Opus 5 (Fast) runs Claude Opus 5 in Anthropic's fast mode, a request configuration that allocates more compute for quicker output. Identical model, identical quality, at premium pricing.

Input and output price
Input $10, Output $50, Per 1M tokens
24h uptime
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Base model
Get API keyRead the docs
import { streamText } from 'ai'


const result = streamText({
  model: 'anthropic/claude-opus-5-fast',
  prompt: 'Why is the sky blue?'
})
Read docs

Copy link to headingFrequently Asked Questions

  • What is fast mode?

    A configuration of Claude Opus 5 that allocates more compute per request so output arrives sooner. It is not a different model and not a smaller one, and quality and capabilities are identical.

  • Will Claude Opus 5 (Fast) give better answers than Claude Opus 5?

    No. It is the same model, so the same prompt produces the same quality of answer. Choose Claude Opus 5 (Fast) for latency, and a different model if quality is the problem.

  • How do I use fast mode?

    On AI Gateway, call anthropic/claude-opus-5-fast as its own model id. On Anthropic's API directly you opt in per request with a speed setting and a beta header, and the response reports which tier served it.

  • Why do fewer providers serve Claude Opus 5 (Fast)?

    Fast mode runs on Anthropic's own API rather than the cloud resellers, so the provider list is shorter than Claude Opus 5's. See the providers shown on this page.

  • How much more does fast mode cost?

    It is a premium over Claude Opus 5, and the multiplier applies across the whole context window, including requests past 200K input tokens. It stacks with prompt caching and data residency multipliers rather than replacing them. See the pricing panel on this page.

  • Is there a separate rate limit for Claude Opus 5 (Fast)?

    Yes, separate from the standard model's. Exceeding it returns a 429 with a retry-after header. The limit replenishes continuously, so the wait is usually short, but handle the retry in your client.

  • Is fast mode generally available?

    It is a research preview with gated access. Confirm your account can reach it before designing a workload around it.

  • What is the context window for Claude Opus 5 (Fast)?

    The context window is 1M tokens, with up to 128K tokens per response, matching the standard model.

  • Does Claude Opus 5 (Fast) support Zero Data Retention?

    Yes, Zero Data Retention is available for this model. Zero Data Retention is offered on a per-provider basis. See https://vercel.com/docs/ai-gateway/capabilities/zdr for details.

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