Switching to gpt 5 mini using api key

StretcherBack · September 27, 2025, 7:28pm

how can i switch the api key from default gpt 5 model to gpt 5 mini using codex ide extension in the VS Code?

_j · September 27, 2025, 10:42pm

You edit the TOML file, which can be launched from within vscode to an editor.

Then follow the documentation, like the first line.

docs/config.md

main

# Config


Codex supports several mechanisms for setting config values:

- Config-specific command-line flags, such as `--model o3` (highest precedence).
- A generic `-c`/`--config` flag that takes a `key=value` pair, such as `--config model="o3"`.
  - The key can contain dots to set a value deeper than the root, e.g. `--config model_providers.openai.wire_api="chat"`.
  - For consistency with `config.toml`, values are a string in TOML format rather than JSON format, so use `key='{a = 1, b = 2}'` rather than `key='{"a": 1, "b": 2}'`.
    - The quotes around the value are necessary, as without them your shell would split the config argument on spaces, resulting in `codex` receiving `-c key={a` with (invalid) additional arguments `=`, `1,`, `b`, `=`, `2}`.
  - Values can contain any TOML object, such as `--config shell_environment_policy.include_only='["PATH", "HOME", "USER"]'`.
  - If `value` cannot be parsed as a valid TOML value, it is treated as a string value. This means that `-c model='"o3"'` and `-c model=o3` are equivalent.
    - In the first case, the value is the TOML string `"o3"`, while in the second the value is `o3`, which is not valid TOML and therefore treated as the TOML string `"o3"`.
    - Because quotes are interpreted by one's shell, `-c key="true"` will be correctly interpreted in TOML as `key = true` (a boolean) and not `key = "true"` (a string). If for some reason you needed the string `"true"`, you would need to use `-c key='"true"'` (note the two sets of quotes).
- The `$CODEX_HOME/config.toml` configuration file where the `CODEX_HOME` environment value defaults to `~/.codex`. (Note `CODEX_HOME` will also be where logs and other Codex-related information are stored.)

Both the `--config` flag and the `config.toml` file support the following options:

## model

This file has been truncated. show original

Topic		Replies	Views
VSCode Extension with API Key Codex codex	8	12951	February 27, 2026
Can't setup Codex CLI with custom base url and api key, via terminal env variables or command options? Codex	2	4949	October 24, 2025
Is there a way to use the GPT-5.2 Pro model directly in Codex CLI? Codex CLI pro	2	290	February 6, 2026
How to turn off the annoying prompts for approval in Codex CLI / VS Code Codex	10	8971	February 12, 2026
Trying to Use o3 in Codex VSCode Codex codex	0	176	September 18, 2025

Switching to gpt 5 mini using api key

Related topics