cli/features.md Codex Docs, 2026-04-23 00:46 UTC → 2026-04-29 00:50 UTC

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108## Models and reasoning108## Models and reasoning

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110For most tasks in Codex, `gpt-5.4` is the recommended model. It brings the110For most tasks in Codex, `gpt-5.5` is the recommended model when it is

111industry-leading coding capabilities of `gpt-5.3-codex` to OpenAI’s flagship111available. It is OpenAI's newest frontier model for complex coding, computer

112frontier model, combining frontier coding performance with stronger reasoning,112use, knowledge work, and research workflows, with stronger planning, tool use,

113native computer use, and broader professional workflows. For extra fast tasks,113and follow-through on multi-step tasks. If `gpt-5.5` is not yet available,

114ChatGPT Pro subscribers have access to the GPT-5.3-Codex-Spark model in114continue using `gpt-5.4`. For extra fast tasks, ChatGPT Pro subscribers have

115research preview.115access to the GPT-5.3-Codex-Spark model in research preview.

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117Switch models mid-session with the `/model` command, or specify one when launching the CLI.117Switch models mid-session with the `/model` command, or specify one when launching the CLI.

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119```bash119```bash

120codex --model gpt-5.4120codex --model gpt-5.5

121```121```

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123[Learn more about the models available in Codex](https://developers.openai.com/codex/models).123[Learn more about the models available in Codex](https://developers.openai.com/codex/models).