OpenAI Launches Sign in with ChatGPT, Letting Subscriptions Work Across Third-Party Apps

At DevDay, OpenAI announced "Bring Your ChatGPT Subscription Anywhere" and launched "Sign in with ChatGPT": users can log into third-party apps with their ChatGPT account and directly draw on their subscription plan's model quota. Thibault Sottiaux, head of the developer platform, confirmed the capability already covers 60+ partner products, with shared quotas and no separate billing rules.

Confirmed

After signing in with "Sign in with ChatGPT", users can use their ChatGPT subscription quota directly in 60+ partner products.
The scheme includes a token-sharing mechanism and lets users set custom usage limits per app (as dkundel noted), with an experience similar to "Sign in with Google."
The feature was officially announced at DevDay (relayed by danshipper as "Bring Your ChatGPT Subscription Anywhere").

Why it matters

petergyang considers this a game-changing feature for app developers: users can use models inside apps without paying again or creating new accounts, dramatically lowering the barrier to adoption.
BorisMPower pointed out that developers no longer need to persuade users to pay a separate API fee for the same capability, greatly reducing friction around monetization and app distribution.
danshipper said he had long called for this capability and considers it extremely important for app developers; bridging subscriptions with the developer ecosystem could reshape how AI apps are distributed.

2026-09-30 ~ 2026-09-30 · 5 related posts

Primary sources

Sign in with ChatGPT lets apps use users' existing subscription tokens, a game changer — petergyang · 2026-09-30 01:47 (UTC+08:00)
Sign in with ChatGPT launches with token sharing and custom usage limits — dkundel · 2026-09-30 02:39 (UTC+08:00)
OpenAI lets users bring their ChatGPT subscription into third-party apps — danshipper · 2026-09-30 01:46 (UTC+08:00)

[source] OpenAI lets users bring their ChatGPT subscription into third-party apps — danshipper · 2026-09-30
[source] Sign in with ChatGPT lets apps use users' existing subscription tokens, a game changer — petergyang · 2026-09-30
ChatGPT subscription now works inside 60+ partner products including Devin, OpenCode and Lovable — TheMoonMidas · 2026-09-30
[source] Sign in with ChatGPT launches with token sharing and custom usage limits — dkundel · 2026-09-30

1 near-duplicate retellings: BorisMPower