Your customer already bought the AI

If your customer already pays for the AI, what are they paying you for?

ChatGPT subscribers can now bring their existing plan usage into participating products. OpenAI announced the expansion through @thsottiaux on X, naming Devin, OpenCode and Notion.¹ A founder selling an AI tool should care about the payment that happened before the customer ever reached their website.

Someone else has already persuaded that person to pay for AI. You might be able to help them get more out of the purchase.

I like that opening for a small company. Asking someone to try a useful tool with usage they already have is a different offer from asking them to buy another bundle of AI credits. It gives you a more specific person to look for, too: someone paying for ChatGPT who still can't finish a particular job.

The customer brings part of the bill

This is more than another login button. In supported apps, eligible Plus and Pro subscribers can authorize requests against the Codex and ChatGPT Work usage included in their plan. The app can still charge its own fees.²

Devin, which makes an AI coding agent, shows how those two bills can coexist. Its ChatGPT connection is available on paid Devin plans. In its cloud product, the customer's ChatGPT plan covers the OpenAI-model portion of a session; other models use Devin's allowance.³

So there is still a business to build around getting the work done. The customer is bringing one ingredient they have already bought. Your product has to explain what it adds and what you're charging for.

For a small team, I'd look for a job that's awkward to do in a general chat window. Imagine a tool for preparing the same client report every month. The useful part could be remembering which files belong to which client, applying the right format, and making the finished report easy to check. Those are reasons to use a specialized product even when the customer supplies the model usage.

That example gives the offer a concrete shape: use the AI you already pay for to finish this particular job, with less setup each month.

You are spending something they could use elsewhere

Connecting another app does not create another allowance. The apps draw from existing plan limits, and customers can cap an app's weekly use.²

Now your reporting tool competes with the coding agent for something besides dollars. A customer who needs to finish a website on Friday may resent a reporting tool that used up the allowance on Thursday. Both tools could be useful, and one could still get disconnected.

I would treat waste as a reason customers leave. Needlessly reprocessing material, retrying a failed job without a stopping point, or using an expensive model for work a simpler one can do spends the customer's room to work elsewhere. Moving that cost off your own invoice doesn't make it disappear.

Devin is already making the connection between model choices and the plan a customer brings. Its announcement says the cloud agent leans more heavily on OpenAI models when a ChatGPT plan is connected.³ The source of payment can influence how the product does the work.

That gives a small product a useful question to answer: can it finish the job while leaving the customer more of their allowance for everything else? I'd want to see a finished report and the usage it took, including the failed attempts. A cheap attempt that needs five retries may be an expensive way to finish.

Find the people who have already paid

Before building around this, check whether your app can use it. OpenAI publishes an integration path for open-source and locally hosted apps; paid or remotely hosted apps are directed to an interest form.⁴ A working example in someone else's product is not approval for yours.

If the integration fits, I'd start with people already paying for ChatGPT who do the same recurring job. Find out what they still copy between tools, what they keep re-explaining, and where they check the result. Build around the part their subscription hasn't solved.

Then let them try one complete job and make both charges understandable: what your product costs and what it uses from their existing plan. The important follow-up is whether they choose to spend their allowance with you again.

If I'm paying separately for your reporting tool, I want the report ready to check without rebuilding the process every month. Make that worth both your fee and the allowance I could spend somewhere else.