models.md Codex Docs, 2026-03-17 00:33 UTC → 2026-03-26 18:27 UTC

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27API Access27API Access

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29![gpt-5.4-mini](/images/api/models/gpt-5-mini.jpg)

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31gpt-5.4-mini

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33Fast, efficient mini model for responsive coding tasks and subagents.

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35codex -m gpt-5.4-mini

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37Copy command

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39Capability

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41Speed

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43Codex CLI & SDK

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45Codex app & IDE extension

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47Codex Cloud

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49ChatGPT Credits

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51API Access

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29![gpt-5.3-codex](/images/codex/codex-wallpaper-1.webp)53![gpt-5.3-codex](/images/codex/codex-wallpaper-1.webp)

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31gpt-5.3-codex55gpt-5.3-codex

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77For most tasks in Codex, start with `gpt-5.4`. It combines strong coding,101For most tasks in Codex, start with `gpt-5.4`. It combines strong coding,

78reasoning, native computer use, and broader professional workflows in one102reasoning, native computer use, and broader professional workflows in one

79model. The `gpt-5.3-codex-spark` model is available in research preview for103model. Use `gpt-5.4-mini` when you want a faster, lower-cost option for

80ChatGPT Pro subscribers and is optimized for near-instant, real-time coding104lighter coding tasks or subagents. The `gpt-5.3-codex-spark` model is

81iteration.105available in research preview for ChatGPT Pro subscribers and is optimized for

106near-instant, real-time coding iteration.

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83## Alternative models108## Alternative models

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