OpenAI’s “Sign in with ChatGPT” lets users of participating third-party apps authorise AI requests against their existing Plus or Pro usage allowances. The change could make it easier to try compatible tools without setting up separate API keys, while leaving users to manage how much of their plan usage those apps consume.
OpenAI Watch analysis
What happened
An article published on 2 October describes the feature, announced at DevDay, and says it launched with 16 partners. It names services including Notion, GitLab, HubSpot, Supabase and Vercel. Users sign in with their ChatGPT account, then manage app usage limits through ChatGPT settings, according to the article.
The article says apps receive basic profile details such as a user’s name, email address and profile picture, but not their chat history or API keys. OpenAI has also released a DevKit with a local SDK, React components and design assets. It includes Paste Perfect, an open-source macOS example app demonstrating the sign-in and usage-sharing flow.
Read the guide to Sign in with ChatGPT.
Why it matters
This gives developers a way to build tools around a customer’s existing ChatGPT subscription allowance, rather than requiring a separately configured API key. For subscribers, it means more choice of tools, but also a reason to check which apps they have authorised and how much usage they can draw from their plan.
Our read
It is a practical bridge between ChatGPT subscriptions and third-party software, not a free-for-all pass for apps to rummage through chat history. The useful test will be how clearly users can see and control their usage as more apps join. A tidy settings page may not sound glamorous, but it beats discovering your allowance has gone walkabout.
What to watch
- Which apps join the feature and what they let users do with their plan allowance.
- How clearly ChatGPT settings show and control each app’s usage.
- Whether developers find the DevKit sufficient to build useful integrations.
Discussion spark: Should subscribers be able to spend their ChatGPT allowance across approved third-party apps, or does that make usage limits harder to understand and control?
Sources and evidence
- How to use your ChatGPT subscription in other apps (2 October 2026, 12:00 UTC)
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