Changelog Update

Today we are introducing a new gpt-5-codex-mini model option to Codex CLI and the IDE Extension. The model is a smaller, more cost-effective, but less capable version of gpt-5-codex that provides approximately 4x more usage as part of your ChatGPT subscription.

Starting today, the CLI and IDE Extension will automatically suggest switching to gpt-5-codex-mini when you reach 90% of your 5-hour usage limit, to help you work longer without interruptions.

You can try the model for a new Codex CLI session using:

codex --model gpt-5-codex-mini

You can also use the /model slash command in the CLI. In the Codex IDE Extension you can select GPT-5-Codex-Mini from the dropdown menu.

Alternatively, you can change your default model to gpt-5-codex-mini by updating your config.toml configuration file:

model = "gpt-5-codex-mini”