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speed.md 2026-03-04 18:18 UTC to 2026-03-05 18:41 UTC

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Tue 31 06:35 Sat 28 06:26 Fri 27 18:23 Thu 26 18:27 Wed 25 18:24 Mon 23 18:22 Fri 20 00:35 Wed 18 12:23 Tue 17 18:24 Mon 16 18:25 Sat 14 00:32 Fri 13 18:15 Wed 11 00:31 Mon 9 00:34 Sun 8 18:10 Sat 7 18:10 Fri 6 00:38 Thu 5 18:41 Wed 4 18:18 Tue 3 18:20

Speed

Fast mode

Codex offers the ability to increase the speed of the model for increased credit consumption.

Fast mode is currently supported on GPT-5.4. When enabled, speed is increased by 1.5x and credits are consumed at a 2x rate.

Enable it by typing /fast. It is available in Codex IDE Extensions, Codex CLI, and the Codex app.

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Codex-Spark

GPT-5.3-Codex-Spark is a separate fast, less-capable Codex model optimized for near-instant, real-time coding iteration. Unlike fast mode, which speeds up GPT-5.4 at a higher credit rate, Codex-Spark is its own model choice and has its own usage limits.

During research preview Codex-Spark is only available for ChatGPT Pro subscribers.