Claude Opus 4.6 Fast Mode: 2.5x Speed Increase for Interactive Work
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Summary
Fast mode is a configuration option for Claude Opus 4.6 that makes the AI model 2.5 times faster at a higher cost per token. It's designed for situations where speed is critical, such as rapid iteration or live debugging, and can be toggled on with /fast command. The mode uses the same underlying Opus 4.6 model with different API settings that prioritize speed over cost efficiency, maintaining identical quality and capabilities. The article explains when to use fast mode versus regular mode based on cost/latency tradeoffs.
Key quotes
· 4 pulledFast mode is a high-speed configuration for Claude Opus 4.6, making the model 2.5x faster at a higher cost per token.
Toggle it on with /fast when you need speed for interactive work like rapid iteration or live debugging, and toggle it off when cost matters more than latency.
Fast mode is not a different model. It uses the same Opus 4.6 with a different API configuration that prioritizes speed over cost efficiency.
You get identical quality and capabilities, just faster responses.
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