Claude Opus 5 (Fast) is a high-speed inference mode of Anthropic’s Claude Opus 5, designed for professional applications that require faster response times and improved efficiency.
It is not a separate standalone model, but an optimized runtime mode that enhances generation speed while maintaining the core intelligence of Claude Opus 5.
Claude Opus 5 (Fast) preserves the model’s advanced capabilities, including complex reasoning, software development, AI Agent workflows, long-context understanding, and enterprise knowledge processing, while providing significantly faster token generation.
The Fast mode is designed for real-time and high-efficiency scenarios such as AI coding assistants, enterprise AI assistants, automated Agents, complex data analysis, and professional workflows.
Compared with the standard Claude Opus 5 experience, Fast mode can deliver up to 2.5× faster output token generation, making it ideal for streaming responses and applications that require rapid content generation.
Claude Opus 5 (Fast) uses the same model capabilities as Claude Opus 5 and focuses on improving responsiveness through optimized inference settings without sacrificing reasoning quality.
Claude 4 Sonnet
99 Anthropic's latest model, excelling in programming and long-form text understanding, supports up to 200K ultra-long context.
Anthropic
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