OpenCode is an open-source, terminal-based AI coding agent built in Go that provides a rich TUI for interacting with AI models to perform code generation, debugging, refactoring, and development automation, created by the team at SST and released in late 2025. It solves the problem of vendor lock-in in AI coding tools by supporting over 75 model providers including OpenAI, Anthropic, Google Gemini, AWS Bedrock, Groq, Azure OpenAI, and OpenRouter, all through a single free tool with no subscription fees. OpenCode has rapidly gained over 95,000 GitHub stars, becoming one of the most popular open-source AI coding agents.
OpenCode offers an interactive TUI built with Bubble Tea, vim-like editing capabilities, persistent SQLite storage for session management, and Language Server Protocol integration supporting 40+ built-in LSP servers for TypeScript, Python, Go, Rust, Java, and more. The tool allows AI to execute commands, modify files, and reason about code structure with full project context, while developers maintain control through review and approval workflows. Unlike subscription-based competitors, OpenCode lets developers bring their own API keys or run local models through Ollama at zero API cost.
OpenCode targets developers who want a powerful, free, and open-source alternative to proprietary AI coding agents like Claude Code, with the flexibility to choose any AI model provider based on performance, cost, or privacy requirements. It is particularly popular among developers who prefer terminal-based workflows, those running local models for offline or air-gapped development, and cost-conscious teams who want enterprise-grade AI coding assistance without monthly subscriptions. OpenCode's MIT license and active community make it a practical foundation for customization and extension.