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But the available models are only open source which are not as powerful as the closed platforms such as ChatGPT 5.2.

According to current LMArena rankings, glm-4.7 matches gpt-5.2 overall (-1 on ELO, 1444 vs 1443, or 0.06% less appreciated.) But this just means that we should probably stop comparing with OpenAI models - they messed up for 3 releases in a row now and are surviving on narrative, not merit (with the exception of math stuffs, because no one else focuses on that.) Anthropic (3 rounds), Google (1 round because they have a more decent release cycle) and xAI (1 round) have continuously beat gpt performance since August; ChatGPT is quickly becoming the MySpace of AI.

It seems for those just looking to get AI for corn ppq.ai is by far the superior option.
[..] learns all [..]
Probably an OK trade off?

That's the dividing line. For me it is not ok, for you it may be.