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OpenAI (Codex OAuth) ​

Codex OAuth uses Rho-owned OAuth and signs in with an OpenAI account subscription rather than an API key. For shared concepts such as credential storage and model selection, see authentication and models.

At a glance ​

SettingValue
Provideropenai-codex
Authcodex
Environment overrideCODEX_ACCESS_TOKEN
API basehttps://chatgpt.com/backend-api/codex
Model listStatic allowlist maintained by Rho

Sign in ​

text
/login openai-codex

/login openai-codex starts Rho's browser-based Codex OAuth flow. For remote or headless sessions where a browser is not available, use the device-code flow:

bash
rho login openai-codex --device-auth

Credentials are stored in the configured credential store, not in config or transcripts.

Device-code authorization ​

Device-code access is managed by OpenAI. See Codex authentication for current setup and troubleshooting guidance. If device-code login is unavailable for the account or managed workspace, use the regular browser callback instead:

bash
rho login openai-codex

Sign out ​

text
/logout openai-codex

/logout openai-codex deletes stored Codex tokens. If an environment override is still present, the provider stays available.

Environment override ​

bash
CODEX_ACCESS_TOKEN=...
CODEX_ACCOUNT_ID=... # optional for Codex

Environment variables are CI/development escape hatches and override stored credentials. For normal interactive setup, prefer /login.

Models ​

Codex OAuth uses this static model allowlist rather than a refreshable API list:

  • gpt-5.6-sol
  • gpt-5.6-terra
  • gpt-5.6-luna
  • gpt-5.5
  • gpt-5.4
  • gpt-5.4-mini
  • gpt-5.3-codex-spark

Switch to a Codex model with:

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/model openai-codex/gpt-5.6-sol

For a non-interactive run, pass the matching provider, auth mode, and model. These flags also update the persistent default:

bash
rho --provider openai-codex --auth codex --model gpt-5.6-sol run "hello"

Run rho login openai-codex first or provide CODEX_ACCESS_TOKEN in the automation environment.

Supported GPT-5.4, GPT-5.5, and GPT-5.6 Codex models can use OpenAI's faster priority tier at a higher credit rate. In the TUI, use /fast on or /fast off. Running /fast with no argument toggles the mode. Rho saves the choice as model.fast_mode, shows (fast) after the active model name, and sends service_tier: "priority" on later supported Codex turns.

Notes ​

  • As a subscription auth mode, the statusline estimates an equivalent API cost from models.dev pricing (including long-context rate tiers when available) and labels it (sub).
  • /limits reports the usage windows for Codex OAuth when you are logged in.
  • Pricing-sensitive models such as openai-codex/gpt-5.6-sol use safer effective context windows below their advertised maximums to avoid long-context pricing thresholds.