OpenAIはAIアプリ向けに"Subscription sharing"を開発している

Finding

OpenAI’s desktop client contains a hidden account meter for “Subscription sharing.” Internal copy describes it as showing how much of a user’s subscription allowance is shared with **“ChatPass applications

How we verified

Methods: reverse engineering.

The Codex desktop client fetches account usage from:

GET /wham/usage
OAI-App-Brand: chatgpt

It expects this optional structure:

{
  "chatpass": {
    "windows": [
      {
        "used_percent": 0,
        "limit_window_seconds": 604800,
        "reset_at": 1788468559
      }
    ]
  }
}

When those windows exist, the app creates a separate Subscription sharing section and displays each as a renewable usage meter.

The client:

• Converts used_percent into “% left.”
• Recognizes five-hour, daily and weekly windows.
• Supports an arbitrary number of windows.
• Sorts shorter windows before longer ones.
• Displays reset times.
• Keeps ChatPass separate from ordinary ChatGPT/Codex limits, credits and workspace spending controls.

This is quota infrastructure, not merely marketing copy.

Why the mini-app connection is plausible

The same client already understands app-runtime identifiers including:

• connector_id
• plugin_id
• canonical_app_id
• app_name
• resource_uri

Those power the plugin/widget system we covered. OpenAI’s public architecture likewise lets plugins ship interactive UI associated with tools through a UI resource URI. OpenAI’s plugin UI reference

Tested versions:

• OpenAI.Codex_26.820.9563.0_x64

Reproduction

RuntimeWire independently reproduced the core finding.

File hashes

• ASAR SHA-256: E353C580EF4939D36F4AE32A35C896D089205C1D06B9F711CF78FFA4A3578A8A

Company response

RuntimeWire requested comment; the company had not responded by publication time.