OpenCode

Claude Code and Codex each tie you to one vendor's models. OpenCode is the open source alternative: an MIT-licensed coding agent that connects to more than 75 providers through Models.dev, including a model running on your own machine through Ollama or LM Studio, and can sign in with a GitHub Copilot or ChatGPT Plus subscription you already pay for. It has passed 200,000 GitHub stars with roughly 950 contributors, which matters for a tool you will build a daily workflow around. OpenCode 2, the current line as of October 2026, changed the architecture. One shared background service per user now owns sessions, configuration, permissions and tool execution, and every terminal, desktop and web client attaches to it, so the same session is reachable from any of them and from another device through pairing. The other notable addition is Code Mode: instead of making one tool call at a time, the agent writes short JavaScript programs that call and combine its tools, including the tools from any MCP server you connect, and the intermediate results never enter the model's context, which saves tokens on multi-step work. Plugins load from npm or local files, though plugins written for version 1 need porting to the new API. Anomaly, the company behind it, earns its money from OpenCode Zen, a curated set of coding models, and the $10-a-month OpenCode Go plan; the agent itself is free and the company says it stores none of your code. Pair it with GitHub for pull requests, and compare it with Cursor or GitHub Copilot if your team prefers an editor to a terminal.