As for opus... I'm the weirdo that refuses to get an ant sub.
At work someone else is paying so we all use Claude Code. It works great but I want to set myself up to have alternatives the day the tech oligarchs decide to tighten the screws.
Open models are perfectly fine to use, but at the moment of course much more expensive than the claude subscription if you do lots of work. The Mistral subscription at $20/mo includes API credits of $20 though.
Any money out of my pocket for third-party AI would either go to highly subsidized services like Google's (I've gotten over $500 in API calls on a $20 subscription I paid $0 for as a student, which also includes GCP credits, CoLab credits, cloud storage, etc.), and once they reign that in and start pricing/offering realistically (Antigravity has been noticably chopped down already since I began using it) I'll switch to API calls from Chinese companies.
GLM has the ~same number of weights as DeepSeek 4.1 but it handles difficult tasks better than DeepSeek (and worse than Kimi). Its price is about halfway between DeepSeek and K3. Most of the popular models are pretty much you-get-what-you-pay-for.