OpenCode Crosses 180K GitHub Stars as an Open-Source Claude Code Rival: Better UI, But Claude Code Still Wins on Cost for Subscribers

OpenCode, a coding agent that lives in your terminal, has just crossed 180,000 stars on GitHub. It's positioned as a direct replacement for tools like Claude Code, 'without the glitchy UI and expensive subscriptions.' Access to hundreds of models -- including free and local ones -- means you're not locked into a single vendor's platform. It ships with the same rich toolset that made Claude Code so useful in the first place: bash, edit, grep, web fetch, and web search -- and having all of that in a free, open-source tool is, in the reviewer's view, genuinely impressive.

One of OpenCode's strengths is how freely you can configure custom agents. If you want everything in one place, a JSON config file lets you define agents beyond the defaults -- like build and plan -- including a custom 'code review' agent that happens to run on Claude Sonnet 4. If you'd rather not keep everything in one file, you can instead describe each agent as a Markdown file inside a `.opencode` folder -- for example, defining a UI-engineer sub-agent that runs on a different model tuned for design work. An `agents.md` file, functionally equivalent to Claude Code's CLAUDE.md, teaches the agents your project's conventions.

The verdict: the UI is considerably better than Claude Code's, and on top of the same toolset, you get the added benefit of bringing your own models and configuring custom tools and agents. Cost, though, isn't black and white. If you're on API-only pricing, OpenCode wins easily thanks to its access to a far wider range of cheaper models. But if you're on an Anthropic Pro or Max subscription, you can't use third-party harnesses like OpenCode at all -- Anthropic specifically blocks that access. And since that subscription bundles in a steep discount versus raw API rates, Claude Code ends up the cheaper option on pure cost for anyone already paying for it.