- Harness: Opencode (via Openchamber) - Subscription: GitHub Copilot (50$) - API Usage (beyond subscription): Open router - Free models: Opencode go
Here's the models I've trialed and like:
- Large (alternative to Opus): GPT 5.3 Codex - Medium (alternative to Sonnet): Minimax 2.7 - Smol: GPT 5.4 mini
these models are not yet on par to their respective Claude alternatives for me, but maybe I need to switch to something else or tune them, what have you been using?
Also looking for nice Opencode plugins, skills, completion providers (alternative to Cursor that I could use with Zen).
Happy to hear about your choices and experience
In my experience (very subjective, obviously) for backend/"logical" tasks Codex seems to outperform Claude.
For front-end/UX related tasks Claude wins easily.
Overall, Claude does seem to be a little better in other areas too.
Codex's biggest advantage in my personal opinion, however, is usage. I think maybe once in several months did I even get close to hitting my limit with the $20 plan.
With Claude, however, I feel like I can sneeze and half my weekly usage is gone. Same $20 price tag.
That's been my experience, I'm sure it differs user to user though.
The underlying motivation is to avoid Big Ai as much as possible. Incentives are not aligned.
Like what?
I can also do things like out the AGENTS.md contents in the system prompt and change file read to put contents there as well. Thai avoids duplicates in the messages when they fail at editing and decide to reread the file