OpenAI Codex CLI with free models from OpenRouter — likez-ai/glm-4.5-air:free

Quick setup:

After installing Codex CLI, it automatically creates a default configuration file under your user directory:

Windows:

%USERPROFILE%\.codex\config.toml

Linux / macOS / WSL:

~/.codex/config.toml

Then you just edit that file,
→ add the [model_providers.openrouter] section,
→ and update the existing model and model_provider lines, like this:

model = "z-ai/glm-4.5-air:free"
model_provider = "openrouter"

[model_providers.openrouter]
base_url = "https://openrouter.ai/api/v1"
env_key = "OPENROUTER_API_KEY"

Then run:

export OPENROUTER_API_KEY="sk-or-..."
codex --model "z-ai/glm-4.5-air:free" --provider openrouter

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