A thread on r/ChatGPTPro last week asked whether a Plus subscription could power any of the newer browser agents, and the top reply was three paragraphs about API keys, rate limits, and why the original poster should just expect to pay twice. That answer is now wrong. Dassi lets you sign in with the same account you use at chatgpt.com, no API key generated, no $5 credit prepaid, no separate billing dashboard to learn.

You already paid. Why pay again?

The default onboarding flow for AI browser tools assumes you don’t have an OpenAI account, or that the one you have isn’t enough, so you’re asked to head to platform.openai.com, navigate to API keys, generate one, paste it back, and top up the developer wallet that funds it. The Plus or Pro subscription you’ve been paying for sits there unused, because chatgpt.com and platform.openai.com are technically two different products on two different billing systems.

But that distinction is a quirk of how OpenAI grew, not a rule of physics. Your subscription buys you access to GPT-5.2, Codex, Sora, and the rest. There’s no reason a Chrome extension can’t ride on that same access, provided OpenAI permits the integration, which they recently started doing.

The login takes thirty seconds

You install dassi from the Chrome Web Store. Open the side panel and pick “ChatGPT (subscription)” from the model dropdown. A new tab opens, you sign in with the OpenAI account you already use, and the side panel closes the loop.

And from that point on, every prompt you fire through the extension runs against your Plus or Pro entitlement. If you’d rather use Claude or Gemini or DeepSeek, you can paste an API key for any of those. So that option doesn’t go away. But it’s just not the only option, and on day one for most people it’s not the right option either.

What the subscription model actually does

The model is the same one you’ve been using on chatgpt.com. Same context window, same reasoning depth, same multimodal handling. But what changes is where it runs. Instead of copy-pasting page contents into a chat tab, dassi sits in the side panel of whatever site you’re already looking at and operates on what’s there.

So you can be on Gmail and ask it to draft three replies. Or staring at a JIRA backlog and ask it to summarize anything assigned to you. Or on a vendor’s pricing page and ask it to pull the comparison table into a spreadsheet without typing a thing. The browser context — the tab you’re already logged into, the page you’ve already loaded, the data you’ve already pulled up — is the whole point of this category of tool, and it’s exactly what cloud browser agents can’t see because their browsers run on someone else’s machine.

And this is the move that subscription login enables for the first time without a credit-card top-up. Before, you’d have to decide whether your browsing was worth a developer-billing setup. Now you decide whether it’s worth twenty bucks a month, which you’re already paying.

What it isn’t

Not an API key in disguise. Rate limits apply. And it’s not permanent: OpenAI controls the integration. The dropdown lets you fall back to any other model if that tap closes.

Try it before you buy more

If you’re already paying for ChatGPT, getting started takes about ninety seconds and costs nothing extra. If you’re not paying for anything yet, you can grab a free API key from any provider that hands one out, paste it in, and skip the subscription path entirely. The first run shouldn’t require you to learn a billing console.

Whether you stay on the subscription or graduate to BYOK later is a question for next week. Or never.