Codex Service Tier Plugin

This plugin is a request normalizer for Codex outbound requests.

When the plugin is enabled and fast is set to true, it sets the top-level service_tier field to priority for requests where:

• req.ToFormat is codex
• req.Model is gpt-5.5

Requests that do not match these conditions are returned unchanged.

Configuration

Add the plugin under plugins.configs:

plugins:
  configs:
    codex-service-tier:
      enabled: true
      priority: 1
      fast: false

fast is a boolean field. Set it to true to enable priority service tier shaping for matching Codex gpt-5.5 requests.