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Guide

How To Use Your ChatGPT Or Claude Subscription With Agents And Other Apps

Partly. A ChatGPT or Claude subscription is not API access; API use is billed separately. But both now let some outside apps draw on your plan. ChatGPT Go, Plus and Pro can share usage with participating apps through Sign in with ChatGPT, with a weekly cap per app. Claude’s help center says third-party apps draw from your plan’s limits. Check each provider’s current rules first.

How To Do It

These steps work with the tools you already have, whatever you use.

  1. Know Subscription From API

    A chat subscription covers the provider’s own apps. API access is a separate developer account paid per use. OpenAI states that API usage isn’t included in Plus, and Anthropic sells API credits through its Console, apart from Claude plans.

  2. Use Sign In With ChatGPT Where Offered

    In a participating app, choose Sign in with ChatGPT or Continue with ChatGPT, then decide whether that app may use your plan. You don’t share an API key or your password, and the app doesn’t get your chats.

  3. Set A Weekly Cap Per App

    In ChatGPT, go to Settings › Usage, find the app under App limits and choose Manage limits. The cap is a ceiling inside your plan, not extra usage.

  4. Watch Claude’s Usage Page

    Claude plans share one usage pool across Claude, Claude Code and permitted outside apps. Check Settings › Usage on claude.ai; at the limit you wait for the reset or turn on extra usage, which is billed.

  5. Read The Provider’s Rules Before Connecting

    Both companies have changed these rules several times. Read the provider’s help page on using your plan in other apps, and never give a tool your account login to “borrow” a plan.

What To Watch Out For

  • If an API key is set on your computer, some tools use it instead of your plan and bill you per use. Claude Code’s help pages warn about exactly this.
  • Agent work uses far more than chatting. One long job can take a big share of a weekly limit, so start with a cap.
  • Team and business AI plans have admin rules for outside apps. Ask your workspace owner before connecting anything.
  • Sharing your password or session with an unofficial tool breaks the provider’s terms and can get the account suspended.

How Octopus Prime Does It

Octopus Prime doesn’t sell AI usage. Agents run on the AI plan you choose, paid to that provider.

  1. Connect The Provider You Pay

    Use the AI plan you already have, under the terms that provider allows for outside apps.

  2. Cap It At The Provider

    Set the provider’s own per-app limit, such as ChatGPT’s App limits, so agent work can’t use up your whole plan.

  3. Give Agents Clear, Bounded Tasks

    A task with a clear finish and a due time does the job and stops, instead of running open-ended.

  4. Two Separate Bills

    Your AI spend stays with the provider you chose; Octopus Prime bills only for the app plan.

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Questions

Does ChatGPT Plus include API access?

No. OpenAI bills API usage separately from Plus. Plus usage can, though, be shared with participating apps through Sign in with ChatGPT.

Can I use my Claude Pro plan in other apps?

Anthropic’s help center currently says third-party app use draws from your plan’s usage limits, and Max and Team plans also include monthly API credits. These rules have changed several times, so check before you rely on them.

Will connecting an app use up my plan faster?

Yes, if the app does heavy work. Set a weekly cap per app in ChatGPT, and keep an eye on Claude’s usage page.

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