OpenAI extends Sign in with ChatGPT so subscribers can spend their plan in third-party tools

OpenAI used its fourth annual DevDay conference on Tuesday to widen "Sign in with ChatGPT" from an identity feature into a way for subscribers to spend their ChatGPT plan inside other companies' products. Plus and Pro subscribers can now use their existing limits in 16 participating services instead of paying the partners separately.

From login to plan usage

OpenAI released Sign in with ChatGPT in July as a beta, working with Airtable, GitLab, HubSpot, Notion, Supabase and Vercel. Then the feature handled identity only: users could open or reach an account on a partner site with their ChatGPT login. Partners received the user's name, email address and profile picture.

The version announced this week goes further. Eligible OpenAI usage inside a participating tool counts against the subscriber's existing ChatGPT plan limits, and users can set weekly caps per app. When a cap is reached, included usage stops rather than rolling over onto the partner's own billing.

The 16 launch partners

OpenAI named 16 launch partners. Available now are OpenCode, OpenClaw, Pi, T3, Hyperagent, Hermes Agent, Vorflux, Amp, Dactyl, Kilo Code, Warp, Conductor, Devin, Notion and Vercel; Lovable is listed as coming soon. An OpenAI spokesperson told The New Stack the list will grow quickly.

Requests from those services draw on the ChatGPT Work and Codex usage included in a plan. That softens a long-standing split in OpenAI's products: a ChatGPT subscription and developer API access were separate purchases, so API users paid by usage, while partner services passed model costs on through their own credits.

Partners had already been testing the idea

One launch partner has run the integration for over a month. Ryan Dahl, known for Node.js, presented Dactyl, a platform for native iOS and Android apps, in late August and highlighted the option to bring an existing ChatGPT subscription into it. Dactyl has a free plan with 100 credits a month and a $20-a-month Builder plan whose description says the agent runs on the user's ChatGPT subscription. Connecting ChatGPT covers the agent that interprets a request and writes Swift code; compiling and publishing still consume Dactyl credits. Plan sharing was initially limited to personal ChatGPT Pro subscribers on the Builder plan or higher; the announcement now extends it to Plus.

OpenClaw took a comparable route in May, letting users run OpenAI agent turns from their ChatGPT subscription through OpenAI's Codex authentication path, which it called a "subscription-backed Codex auth profile." Its documentation now lists Codex account login and Sign in with ChatGPT as separate methods next to a traditional API key.