I tried them both out with a task of creating a todo-like web app (you can use the chat interface for GLM 5 for free if there's capacity). GLM 5 ended up with a working version. Sadly StepFun didn't quite function right. The main issue was that it ended up putting everything that should be in different columns into a single one. I didn't prompt it further to fix it, but it seems relatively capable. I think it beat what the big Qwen model came up with.

What's really surprising to me is the cost of the model. It's definitely very good for its price. DeepSeek is the only one that offers and competition to it at that price point (GLM 5 is literally 10x more expensive).