speed.md +23 −0 added
1# Speed
2
3## Fast mode
4
5Codex offers the ability to increase the speed of the model for increased
6credit consumption.
7
8Fast mode is currently supported on GPT-5.4. When enabled, speed is increased
9by 1.5x and credits are consumed at a 2x rate.
10
11Enable it by typing `/fast`. It is available in Codex IDE Extensions, Codex
12CLI, and the Codex app.
13
14[
15Your browser does not support the video tag.
16](/videos/codex/fast-mode-demo.mp4)
17
18## Codex-Spark
19
20GPT-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,
21Codex-Spark is its own model choice and has its own usage limits.
22
23During research preview Codex-Spark is only available for ChatGPT Pro subscribers.