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As of September 1, 2026, this dedicated fast model is deprecated. Fast mode is now served by the fast service tier endpoint on Claude Opus 5Opens in new tab — request it with service_tier: "fast" or speed: "fast". Requests to this model keep working and are served by the same fast tier capacity, so no action is required, but new integrations should target the regular model. Learn more in our service tier docs: https://openrouter.ai/docs/guides/features/service-tiersOpens in new tab

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Anthropic: Claude Opus 5 (Fast)

anthropic/claude-opus-5-fast

Fast-mode variant of Opus 5 - identical capabilities with higher output speed at 2x pricing relative to regular Opus 5.

Learn more in Anthropic's docs: https://platform.claude.com/docs/en/build-with-claude/fast-modeOpens in new tab

Note: As of September 1, 2026, this dedicated fast model is deprecated. Fast mode is now served by the fast service tier endpoint on Claude Opus 5Opens in new tab — request it with service_tier: "fast" or speed: "fast". Requests to this model keep working and are served by the same fast tier capacity, so no action is required, but new integrations should target the regular model. Learn more in our service tier docs: https://openrouter.ai/docs/guides/features/service-tiersOpens in new tab

Modalities

Context

1.0M

Released

Jul 24, 2026

ActivityFAQExplore

Activity

Token volume and request traffic to this model over time.

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Frequently asked questions

Fast-mode variant of Opus 5 - identical capabilities with higher output speed at 2x pricing relative to regular Opus 5. Learn more in Anthropic's docs: https://platform.claude.com/docs/en/build-with-claude/fast-modeOpens in new tab Note: As of September 1, 2026, this dedicated fast model is deprecated.

Claude Opus 5 (Fast) has a 1,000,000 token context window.

Claude Opus 5 (Fast) accepts text, images, and files such as PDFs as input and returns text.

Claude Fable 5.1, Claude Opus 5, Claude Sonnet 5 and 12 more are other text models from Anthropic.

Claude Opus 5 (Fast) was released on July 24, 2026.