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Claude Opus 5 (Fast)

anthropic/claude-opus-5-fast

Anthropic / Claude

Fast-mode variant of [Opus 5](/anthropic/claude-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-mode

Released

2026-07-24

Context window

Max output

128K

Weights

Closed

Modalities

TextInputImageInputDocumentInputTextOutput

Capabilities

ReasoningTool callStructured

Providers

Kilo Gateway OpenRouter Vercel AI Gateway

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