cli/features.md Codex Docs, 2026-03-05 06:22 UTC → 2026-03-05 18:41 UTC

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47## Models and reasoning47## Models and reasoning

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49For most coding tasks in Codex, `gpt-5.3-codex` is the go-to model. It’s available for ChatGPT-authenticated Codex sessions in the Codex app, CLI, IDE extension, and Codex Cloud. For extra fast tasks, ChatGPT Pro subscribers have access to the GPT-5.3-Codex-Spark model in research preview.49For most tasks in Codex, `gpt-5.4` is the recommended model. It brings the industry-leading coding capabilities of `gpt-5.3-codex` to OpenAI’s flagship frontier model, combining frontier coding performance with stronger reasoning, native computer use, and broader professional workflows. For extra fast tasks, ChatGPT Pro subscribers have access to the GPT-5.3-Codex-Spark model in research preview.

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51Switch models mid-session with the /model command, or specify one when launching the CLI.51Switch models mid-session with the `/model` command, or specify one when launching the CLI.

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53```bash53```bash

54codex --model gpt-5.3-codex54codex --model gpt-5.4

55```55```

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57[Learn more about the models available in Codex](https://developers.openai.com/codex/models).57[Learn more about the models available in Codex](https://developers.openai.com/codex/models).