cli/features.md Codex Docs, 2026-03-17 00:33 UTC → 2026-04-10 18:23 UTC

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47## Models and reasoning47## Models and reasoning

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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.49For most tasks in Codex, `gpt-5.4` is the recommended model. It brings the

50industry-leading coding capabilities of `gpt-5.3-codex` to OpenAI’s flagship

51frontier model, combining frontier coding performance with stronger reasoning,

52native computer use, and broader professional workflows. For extra fast tasks,

53ChatGPT Pro subscribers have access to the GPT-5.3-Codex-Spark model in

54research preview.

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51Switch models mid-session with the `/model` command, or specify one when launching the CLI.56Switch models mid-session with the `/model` command, or specify one when launching the CLI.

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