> the most popular model

It was free for a long time. That usually skews the statistics. It was the same with grok-code-fast1.

Glm also has their subscription witch I would assume heavy users to use.

the real surprising part to me is that, despite being the cheapest model on board, stepfun is often able to score high at pure performance. Other models at the same price range (e.g. kimi) fails to do that.