DeepSeek Harness’s own fast mode: the same model, half the output, up to twice as fast. Switches combine freely and stay prompt-side — never changes the model, reasoning effort, or the request body. Best measured 0.505x wall clock, −42% output tokens, 438
The plugin will be installed here. Keep web if you are unsure.
npx -y @deepseek-ai/dsh plugin --profile web add dsh-fast-mode@1.7.28
Compatibility and provenance
Fast Mode is published as dsh-fast-mode and currently resolves to version 1.7.28. The Hub verifies its manifest and preserves the exact installation source for reproducible installs.