Opencode offers free models with 200/requests over 5 hours. That's why I use it. It is the only reason I care about.
What's the alternative there? Gemini used to have free tiers. Qwen used to. AMP used to. Ollama cloud used to. Codebuff used to... None of them have those programs anymore
The reason I use it is purely financial. I do not have an employer and I'm writing free software
Edit: pi.dev doesn't have free inference endpoints. That's the constraint.
You could easily just use Pi or even a Codex fork to avoid Opencode as a harness and still pay zero dollars.
Currently only Mimo has a usable free offer with their own CLI. (opencode clone)
pi.dev
There are other OSS agent harnesses.