Codex CLI

Codex CLI supports custom model providers in its config file.

Set it up

Export your key:

export CHEAPAIMODEL_API_KEY="sk-..."

Then add a provider to ~/.codex/config.toml:

model = "glm-5.3"
model_provider = "cheapaimodel"

[model_providers.cheapaimodel]
name = "cheapaimodel"
base_url = "https://api.cheapaimodel.ai/v1"
env_key = "CHEAPAIMODEL_API_KEY"
wire_api = "responses"

Run codex as usual. Codex speaks only the Responses API; any model in the catalog that lists /v1/responses works in place of glm-5.3.