#2292 How do you specify the thinking mode?

Description

I'm using deepseek harness, but the problem is I cant seem to specify the thinking mode properly in dsh!
it does offer the thinking mode for other models from opencode/TokenHarbor but not strata. 

I also couldnt change that in OpenCode. when I do /variants, it displays this message : 

```
No variants availablex
The current model does not support any variants.
```

I also noticed, in deepseek harness, the image capabilities of the model is not recognized, it reports the model (strata) only supports text/pdf! whereas in the strata web UI and also llama.cpp's the image capability works just fine! 

Has anyone faced this issue? how do you fix this?  Should I be adding something to my configs?