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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
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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.)

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That’s a different discussion.
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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.
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If you're using the sub, only OpenAI (via the OAuth token) is viable. Claude is API_KEY only
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It's allowed, but you get bumped to per token pricing.
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Not true; They rolled back some of the changes you're thinking about IIRC.
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That defeats the purpose of using the Claude subscription.
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