@calesennett/pi-codex-fast

pi extension that adds service_tier=priority to supported OpenAI Codex requests when fast mode is enabled.

Packages

Package details

extension

Install @calesennett/pi-codex-fast from npm and Pi will load the resources declared by the package manifest.

npm report
$ pi install npm:@calesennett/pi-codex-fast
Package
@calesennett/pi-codex-fast
Version
0.1.5
Published
Jul 11, 2026
Downloads
447/mo · 233/wk
Author
calesennett
License
unknown
Types
extension
Size
244.8 KB
Dependencies
0 dependencies · 1 peer

Security note

Pi packages can execute code and influence agent behavior. Review the source before installing third-party packages.

README

pi-codex-fast

Fast-mode extension for pi that injects service_tier: "priority" into supported OpenAI Codex requests.

Usage

Inside pi:

  • /codex-fast to toggle

From CLI:

  • pi --fast

Persistence

The enabled/disabled state is read from pi's settings files:

  • global: $PI_CODING_AGENT_DIR/settings.json (or ~/.pi/agent/settings.json)
  • project override: <cwd>/.pi/settings.json

under the key pi-codex-fast.enabled.

Writes go to the global settings file.

Behavior

The extension only patches provider payloads when all of these are true:

  • fast mode is enabled
  • the active model is one of:
    • openai-codex/gpt-5.4
    • openai-codex/gpt-5.5
    • openai-codex/gpt-5.6-sol
    • openai-codex/gpt-5.6-terra
    • openai-codex/gpt-5.6-luna

All other requests are left unchanged.

Example benchmark

A local live benchmark is available in this repository under evals/. Three paired trials per model produced:

Model TTFB speedup Turn speedup Wall speedup
gpt-5.6-sol 1.52x 1.58x 1.57x
gpt-5.6-terra 1.05x 1.34x 1.33x
gpt-5.6-luna 1.30x 2.31x 2.25x