There is also duck.ai, which doesn't required an account (and there's no way to even have an account).
Mistral, the French AI, can also be used without an account through their chat app, and they give an option to exclude your data from training models, even for free users.
How does GLM 4.5 (Air or regular) compare to more popular models? I picked its answer once on LMArena, but that's all my encounters with it.