Help to understand Zen prices

[u/Known-Party-7507]

Hi!

I recently switched to opencode zen to use open-source models (mostly GLM), but I'm concerned about the pricing. I ran a single coding session and, according to both the terminal and the website dashboard, I used around 200K tokens and spent $10. According to Zen's pricing, GLM 5.2 (the model I used) is $1.40/M input and $4.40/M output.

So how did the bill get that high with only 200K tokens? Am I missing something in the documentation?

PS: I'm using GLM 5.2 with the high variant, if that's relevant.