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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?'
})
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Copy link to headingAbout Claude Opus 5 (Fast)

Claude Opus 5 (Fast) is Claude Opus 5 served in Anthropic's fast mode. Fast mode is not a different model and not a smaller one: it is a configuration of the same model that allocates more compute per request, so responses arrive sooner at identical quality and with identical capabilities.

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

Everything that defines Claude Opus 5 carries over, including the 1M tokens context window, reasoning on by default with configurable effort, tool calling, structured output, and streaming. AI Gateway publishes live latency and throughput metrics on this page, so you can compare against the standard model rather than working from a quoted multiplier.

Interactive work is where this earns its price. Rapid iteration, live debugging, and agent loops that chain many calls all shorten at every step, and the saving accumulates across a run. A single background completion rarely justifies it.

You can integrate Claude Opus 5 (Fast) through AI SDK, Chat Completions API, Responses API, Messages API, or other API formats, from TypeScript or Python.

Your use is subject to Anthropic's Terms & Privacy Policies.