Claude Opus 4.8 (Fast)

Overview

Fast-mode variant of [Opus 4.8](/anthropic/claude-opus-4.8) - identical capabilities with higher output speed at 2x pricing relative to regular Opus 4.8. Learn more in Anthropic's docs: https://platform.claude.com/docs/en/build-with-claude/fast-mode

How to use / API access

Call via OpenRouter with model id `anthropic/claude-opus-4.8-fast`.

• openrouter · anthropic/claude-opus-4.8-fast Docs

OpenRouter id: anthropic/claude-opus-4.8-fast

Benchmarks

• Intelligence Index (artificial-analysis) : 55.7 index
• Coding Index (artificial-analysis) : 74.3 index
• Agentic Index (artificial-analysis) : 47.2 index

Notes

Claude Opus 4.8 (Fast) is listed in the EDNA Models directory from the OpenRouter catalogue.