OpenCode | The Open-Source AI Coding Agent - an open-source coding agent that could soon outperform Claude Code. Very good in execution and above all provider-agnostic. You can attach any model, even one self-hosted with LM Studio or ollama. If you just want to play around, you can simply download it and get started, even without providing a credit card (then of course with limited tokens, but quite usable for initial experiments. And independent of the major providers (ok, except for their models if you want to use them - and for serious coding, those are unfortunately still necessary). OpenCode also offers its own AI models, which are then billed, but a few models are always freely available and thus offer quite serious experimentation without investment.