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Sign in with ChatGPT now counts Amp and Devin agent runs against Plus and Pro plan limits
OpenAI now lets ChatGPT Plus and Pro subscribers spend their plan allowance inside tools from 16 launch partners, including Amp and Devin, via Sign in with ChatGPT. The model cost moves to the subscriber's plan, while tools like Dactyl keep billing credits for builds and assets.
The Engineer · Build desk
What happened
- Sign in with ChatGPT began as a July beta for logging in, giving partners a user's name, email address and profile picture, with plugin permissions approved separately.
- Subscribers can set a weekly cap for each app, and once a limit is reached, included usage stops instead of switching automatically to the partner's own billing.
- Fifteen of the 16 launch partners, including OpenCode, Warp, Kilo Code and Conductor, are live now, with Lovable listed as coming soon.
- Before OpenAI's announcement, Dactyl limited plan sharing to personal Pro subscribers, so Plus and Business users got only the login and kept spending Dactyl credits.
- OpenClaw let users run OpenAI agent turns on a ChatGPT subscription in May, using a Codex auth profile created by signing in from its command line.
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Why it matters
- cost Model spend for partner agents lands on whoever holds the ChatGPT subscription, and it comes out of the same Codex allowance that person uses for their own work.
- constraint A tool that hits its weekly cap loses included usage outright, so anyone depending on it for daily agent runs needs a paid route they have set up in advance.
- decision Companies budgeting tool seats cannot yet plan on routing model usage through company ChatGPT plans, because the coverage OpenAI announced covers Plus and Pro subscribers.
Partner requests are metered against the ChatGPT Work and Codex usage already included in the subscriber's plan [8]. One allowance now pays for two kinds of work [8]. A long Amp or Devin session spends the same budget the subscriber would otherwise use in Codex directly [8]. Only usage OpenAI calls "eligible" counts against those limits, and each partner's consumption can be capped [5].
I think the hard stop at the cap is the right default for a paid subscription [9]. The person paying sees the failure: the tool stops drawing on the plan, and nothing switches to the vendor's own billing automatically [9]. Each partner then has to decide what its product does for a user whose included usage has run out [9].
Dactyl, the native mobile app builder Ryan Dahl debuted in late August [10], shows where the model bill ends. Its $20-a-month Builder plan promises "no token bills from us" [11]. The wording is precise, and I mean that as praise for whoever wrote it: tokens are the one line item it removes [11][12]. According to Dactyl's documentation, the ChatGPT connection covers the agent that interprets a request and writes the Swift code [12]. Compiling the app, generating icons and images, creating 3D assets and publishing still consume Dactyl credits [12]. Users do not supply an OpenAI API key. Authentication runs through their normal ChatGPT account [13].
For a team, the budget change is smaller than "no token bills" suggests. Moving model spend for tools like these off a company API account would need two things to be true. First, the company's own ChatGPT plan would have to qualify. OpenAI's announcement extends plan usage to Plus and Pro subscribers [15], and The New Stack's report does not say Business plans are included. Second, the Codex usage in each plan would have to cover a week of agent runs across every tool drawing on it [8]. That depends on the team's workload. Tool seats stay in the budget either way, because Dactyl-style tools still bill for non-model work [12].
OpenAI announced the program Tuesday at DevDay, its fourth annual developer conference [2]. "We're starting with these 16 launch partners today, and we'll expand quickly," the company said in a statement [7].
What to watch
- Whether OpenAI extends plan usage to ChatGPT Business, which decides whether companies can move tool model spend onto ChatGPT seats.
- How OpenAI defines 'eligible' usage, and whether per-app weekly caps become something an administrator can set.
- Lovable going live, and which partners OpenAI adds after its first 16.