pi-openai-fast

A minimal pi extension that enables OpenAI Codex Fast mode when explicitly requested through an environment variable.

Usage

Install the package:

pi install npm:@wyattjoh/pi-openai-fast

Start pi with Fast mode enabled:

OPENAI_FAST_MODE=1 pi

Reload pi after installing the extension if it is already running:

/reload

Fast mode is disabled when OPENAI_FAST_MODE is unset or has any value other than 1.

Behavior

For eligible requests, the extension adds the OpenAI priority service tier to the request payload:

{
  "service_tier": "priority"
}

The extension only modifies a request when all of the following are true:

• OPENAI_FAST_MODE=1 was present when pi loaded the extension.
• The provider is openai-codex.
• The API is openai-codex-responses.
• ChatGPT OAuth/subscription authentication is in use.
• The selected model is one of:
  • gpt-5.4
  • gpt-5.5
  • gpt-5.6-sol
  • gpt-5.6-terra
  • gpt-5.6-luna
• The payload targets the selected model.
• The payload does not already contain service_tier.

The extension has no command, status indicator, or configuration file. Change the environment variable and restart pi (or run /reload after changing pi's environment) to change the behavior.