OpenCode

OpenCode is a Go-based terminal coding agent with a TUI (Terminal User Interface) built on the Bubble Tea framework. It is entirely open source (MIT license) and free to use — you bring your own API keys to any of 75+ supported LLM providers, or run local models for free via Ollama. Supported providers include Anthropic, OpenAI, Google Gemini, AWS Bedrock, xAI Grok, DeepSeek, Mistral, and Groq. The tool integrates LSP (Language Server Protocol) for real-time diagnostics and inline code intelligence, giving the agent the same contextual awareness as a full IDE without leaving the terminal. Sessions persist across terminal disconnects via a client/server architecture backed by SQLite, meaning long-running coding tasks survive network interruptions. GitHub Actions integration allows mentioning /opencode in issue or PR comments to trigger automated coding tasks in CI. Key capabilities include multi-session support, vim-style keyboard navigation, a TUI with syntax highlighting, and the ability to work on any codebase in any language. The GitHub Actions integration is particularly useful for teams wanting CI-level coding automation without a paid service subscription. Pricing: OpenCode itself is completely free and open source. You pay only for the LLM API calls you make to your chosen provider. Running entirely on local models via Ollama costs nothing beyond hardware. Limitations: OpenCode is terminal-only — there is no GUI, IDE extension, or browser interface. Setup requires technical knowledge including API key management and provider configuration. The UX is less polished than commercial tools, and result quality depends entirely on which LLM you configure. Best suited for developers who work primarily in the terminal and want a free, highly configurable, provider-agnostic coding agent with no subscription cost.