/fast

Turns a Fast service tier on or off, when available.

Turns a catalog-provided Fast service tier on or off, when available. The Fast tier prioritizes speed. Whether it is offered depends on the model catalog.

✅ WHEN TO USE IT?

Prefer faster responses when the tier is offered

/fast

⛔ WHEN NOT TO?

The catalog offers no Fast tier

/fast only takes effect when a Fast service tier is available.

Better: pick a faster model via /model

SOURCES

Codex CLI docs: Slash Commands ↗ developers.openai.com

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