Why wouldn't you use something open source like OpenCode, which already support DSv4 and has more features than CC?
As someone who does use other models with CC, I am curious about opencode, what extra features does it have that you find essential?
More features than CC ?
Also opencode tracks you by default. Its not safe. Every first prompt you send is routed through their servers, logged and they can use your data however they want
Coding harnesses make a big difference, and OpenCode is notably less effective than Claude Code (1) in my experience, (2) with the models I've tried it on. (I've not yet tried it with DSv4.)