It is pretty obviously no. API keys billed by the token, yes, Oauth to the flat rate plans no.
> OAuth authentication (used with Free, Pro, and Max plans) is intended exclusively for Claude Code and Claude.ai. Using OAuth tokens obtained through Claude Free, Pro, or Max accounts in any other product, tool, or service — including the Agent SDK — is not permitted and constitutes a violation of the Consumer Terms of Service.
If you look at this tweet [1] and in particular responses under it, it still seems to me like some parts of it need additional clarification. For instance, I have seen some people interpret the tweet as meaning using the OAuth token is actually ok for personal experimentation with the Agent SDK, which can be seen as a slight contradiction with what you quoted. A parent tweet also mentioned the docs clean up causing some confusion.
None of this is legal advice, I'm just trying to understand what exactly is allowed or not.
Then they should speak to legal about fixing the ToS before making public statements about their intentions with it. It won't look good to show up at arbitration and have to explain why your public comms contradict your ToS.
>A flat fee, also referred to as a flat rate or a linear rate refers to a pricing structure that charges a single fixed fee for a service, regardless of usage.
There are no other definitions that‘s why they why internet flat rates got throttled instead of capped.
Throttling is the loop bole because you paid for usage not for speed but flat rate with a cap is simply a lie.
> OAuth authentication (used with Free, Pro, and Max plans) is intended exclusively for Claude Code and Claude.ai. Using OAuth tokens obtained through Claude Free, Pro, or Max accounts in any other product, tool, or service — including the Agent SDK — is not permitted and constitutes a violation of the Consumer Terms of Service.