Your Claude or ChatGPT plan on Extent: what the terms say
Extent runs your bots on the Claude or ChatGPT plan you already pay for. Here is what Anthropic and OpenAI say about that, quoted, and where Extent stands on each point.
How Extent uses your plan
Each bot runs the official Claude Code or Codex, as Anthropic and OpenAI publish it, in a container that serves only you. You sign in yourself, on Anthropic's or OpenAI's own sign-in page. Extent seals the sign-in it gets back and uses it only for your bots.
The usage counts against your plan, under your own agreement with Anthropic or OpenAI. Extent doesn't pay for it, resell it, or pool it with anyone else's. No one else's bots run on your plan.
Anthropic
Anthropic's legal and compliance page lets a platform run Claude Code "in hosted sandboxes or other agent infrastructure", on two conditions:
- "The Claude Code binary must not be modified." Extent installs and runs it as published.
- "Customers may not pay for, resell, or intermediate Claude usage on their end users' behalf. Each end user must authenticate with their own Anthropic API key, Claude subscription plan credentials, or 3P inference provider credential." On Extent, each person signs in with their own plan, and the usage is billed to them.
The same page says the rules on sign-ins don't prevent "an end user from signing in to the unmodified Claude Code binary with their own Claude subscription, including where a platform hosts Claude Code". That is the setup Extent uses.
Two lines on that page don't fit Extent as it works today:
- Developers building on the Agent SDK "should use API key authentication". Extent starts Claude Code through the Agent SDK.
- "Developers may not collect, store, or intermediate Claude.ai credentials or session tokens." Your sign-in completes on Anthropic's page, but Extent keeps the resulting token, sealed, so your bots can run while your phone is off.
The page also notes that plan limits "assume ordinary, individual usage of Claude Code and the Agent SDK". A bot that works all day uses more than a person typing, and Anthropic decides what counts as ordinary.
OpenAI
For ChatGPT, you sign in with your own ChatGPT account on OpenAI's sign-in page, and your bots run Codex on your plan. OpenAI sets the rules for apps that run on a ChatGPT plan under Sign in with ChatGPT: the plan serves the person who signed in, and the app doesn't charge for model use or pool plans between people. Extent charges nothing for model use, and your plan runs only your bots.
What this means for you
- Your plan is used only by your bots, and only through Anthropic's and OpenAI's own apps.
- You can remove a plan at any time. Extent deletes its sealed sign-in at once.
- An API key fits both providers' terms with no open points. You can connect one instead of a plan, though it usually costs more for the same use.
We checked both providers' pages on 31 October 2026 and will update this post when they or Extent change. Questions go to hello@extent.sh.