Claude Opus 5 (Fast)

anthropic/claude-opus-5-fast

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

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Context window: 1M
Input: Text · Image · Document
Output: Text
Released: 2026-07-24

Max output: 128K
Knowledge cutoff: 2026-05
Weights: Closed
Capabilities: Reasoning, Tool call, Structured

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ModelRegistry · Catalog updated 2026-09-29