If you're using the sub, only OpenAI (via the OAuth token) is viable. Claude is API_KEY only

That’s a different discussion.

I suspect a lot of people wouldn't use AI if they had to pay per token at current rates. Yes, it's technically a different discussion, but "just write your own harness" isn't really an answer for the vast majority of us riding on the investor-subsidized subscription plans.

It's allowed, but you get bumped to per token pricing.

That defeats the purpose of using the Claude subscription.

Not true; They rolled back some of the changes you're thinking about IIRC.

It's trivial to bypass this by tweaking the system prompt in other harnesses. They use string matching and a blacklist.

https://x.com/FlorianKluge/status/2041855675295318039

(Whether that's against the ToS is not clear.)

Amp recently achieved it. Apparently it's permitted as long as you use the Claude Agent SDK. https://ampcode.com/news/use-your-claude-plan

This is bait and switch..

You can’t just use your Claude sub on a third party harness without getting blocked even if you use the Agent SDK. Apparently, Anthropic gives “credits” depending on your sub and you can use those _credits_ when you use third party harnesses or Claude -p mode. That usage is not the same Claude sub one would assume it is… It is all quite deceiving. Don’t get a Claude sub unless you’re okay with being locked into Claude Code…

I don't use Claude, but it appears it is permitted to use Claude as a stdin/stdout -communicated tool using JSON, or use Claude SDK, with the monthly plans. Monthly Max/Team plans also include credits that could be used directly via the API: https://support.claude.com/en/articles/17154008-monthly-api-... .

E.g. OpenCode can be used with all three methods. Looks like it needs a plugin for the two Claude methods, though.