Codex CLI with MonkeyAI: validate the API first, then apply the supported configuration.

Verify these three items before editing config

1. The key and Base URL have already passed a direct API test.
2. Your current Codex CLI version supports the provider / Base URL path you plan to use.
3. You know whether you are using env vars or a config file.

Option A: environment variables

Use this for short-term validation in the current shell or project.

export OPENAI_API_KEY=sk-你的Key
export OPENAI_BASE_URL=https://monkeytheme.com/v1
export OPENAI_MODEL=gpt-4.1-mini

Option B: config-file workflow

This is better for longer-lived use.

Common Codex mistakes

1. Mixing official OpenAI flow with a custom provider flow.
2. Assuming another person’s CLI version supports the same fields as yours.
3. Supplying only half of the Base URL a specific flow expects.
4. Using a nickname instead of the real model name.