OpenCode
Open source AI coding agent with 150K+ GitHub stars. Runs in terminal, desktop app, or VS Code. Connects to 75+ LLM providers including Claude, GPT, Gemini, and local models. Supports multi-session parallel agents, LSP integration, and reuses existing Copilot or ChatGPT Plus subscriptions.
OpenCode: A GitHub Copilot Alternative for Terminal-First Developers
OpenCode is an open source AI coding agent developed by Anomaly under the opencode.ai brand. It runs in the terminal, as a desktop app, or as an IDE extension, and connects to 75+ LLM providers including Claude, GPT, Gemini, and local models. As a GitHub Copilot alternative, it is best suited for developers who want model-neutral, privacy-first coding assistance without vendor lock-in.
OpenCode vs. GitHub Copilot: Quick Comparison
| OpenCode | GitHub Copilot | |
|---|---|---|
| Type | CLI Agent / IDE Extension | IDE Extension / CLI |
| IDEs | Terminal (TUI), desktop app, VS Code extension | VS Code, JetBrains, Vim, Neovim, Visual Studio, Xcode |
| Pricing | Free (open source); Zen managed models available | Free for students/OSS; Individual $10/mo; Business $19/mo; Enterprise $39/mo |
| Models | 75+ providers via Models.dev; GitHub Copilot, ChatGPT Plus, local models | OpenAI GPT-4o, Claude 3.5 Sonnet, Gemini 1.5 Pro (multi-model) |
| Privacy / hosting | No code or context storage; privacy-first by design | Cloud (GitHub/Microsoft) |
| Open source | Yes (Apache 2.0) | No |
| Offline / local models | Yes | No |
Key Strengths
- Model flexibility: OpenCode connects to 75+ LLM providers through the Models.dev registry. Developers can swap between Claude, GPT, Gemini, local models via Ollama, or even reuse existing GitHub Copilot or ChatGPT Plus subscriptions at no additional cost.
- Privacy-first architecture: OpenCode does not store any code or context data server-side. This makes it suitable for privacy-sensitive environments, corporate security policies, and regulated industries where cloud-based code processing is restricted.
- Multi-session and LSP support: Developers can start multiple agents in parallel on the same project. OpenCode automatically loads the correct Language Server Protocol (LSP) definitions for each codebase, giving the agent IDE-grade intelligence for go-to-definition, references, and diagnostics.
- Scale and community trust: With over 150,000 GitHub stars, 850 contributors, and 6.5M+ monthly active developers, OpenCode is one of the most widely adopted open source coding agents available in 2026.
- Cross-surface availability: Available as a TUI (terminal UI), desktop application, and IDE extension — making it adaptable to different workflows without requiring a migration between tools.
Known Limitations
- Terminal-first UX: While a desktop app and IDE extension exist, the primary interface is the terminal. Developers who prefer a deeply integrated IDE experience with real-time inline suggestions may find the workflow less seamless than GitHub Copilot's native VS Code integration.
- No built-in autocomplete (inline): OpenCode is an agentic tool — it works on tasks rather than providing character-by-character inline code completion. Developers looking for fast, keystroke-level suggestions will need a complementary extension.
- Self-managed model costs: When using your own API keys, you pay model providers directly. While this offers cost transparency, it requires understanding each provider's pricing and managing API key rotation.
Best For
OpenCode is best suited for experienced developers and engineering teams who want full control over their AI toolchain. It excels in privacy-sensitive environments, polyglot teams that need to swap models dynamically, and developers who prefer a terminal-native workflow or want to reuse existing Copilot or ChatGPT subscriptions to power a more capable agentic tool.
Pricing
- Free (open source): Self-hosted with your own API keys — free to use with any of 75+ supported providers.
- OpenCode Zen: Managed, curated model access via opencode.ai/zen — token-based pricing, tested and benchmarked specifically for coding agent workloads. Exact pricing available on the official site.
Prices are subject to change. Check the official Zen pricing page for current details.
Tech Details
- Type: CLI Agent / IDE Extension
- IDEs: Terminal TUI, desktop app, VS Code extension
- Key features: Multi-session parallel agents, LSP integration, share links for sessions, 75+ LLM providers, GitHub Copilot auth, ChatGPT Plus auth, local model support, plan mode, image input support
- Privacy / hosting: No server-side code storage; local and cloud modes
- Models / context window: 75+ providers via Models.dev including Claude, GPT, Gemini, Llama, local models; context window depends on provider and model selected
When to Choose This Over GitHub Copilot
- You want to run agentic multi-step tasks rather than single-line completions
- You need model flexibility — ability to switch between Claude, GPT, Gemini, or local models without changing tools
- Privacy or compliance requirements prevent sending code to GitHub/Microsoft infrastructure
- You already have a GitHub Copilot or ChatGPT Plus subscription and want to use it in a more powerful agentic context
- You prefer open source tools with a transparent codebase and community governance
When GitHub Copilot May Be a Better Fit
- You primarily need fast, inline keystroke-level code suggestions inside VS Code or JetBrains — Copilot's inline completion is more polished for this use case
- Your team uses a fully managed, enterprise-grade tool with dedicated GitHub support and SLA guarantees
- You want a GUI-native experience without any terminal involvement
Conclusion
OpenCode is the best choice for developers who want a model-neutral, privacy-first, open source coding agent with agentic capabilities beyond what GitHub Copilot's inline completion model offers. With 150,000+ GitHub stars and 6.5M monthly developers, it has earned its place as the most widely adopted open source alternative in the terminal-first category. Teams already paying for Copilot or ChatGPT Plus can immediately repurpose those subscriptions inside OpenCode at no extra cost.
Sources
FAQ
Is OpenCode free?
Yes. OpenCode is fully open source and free to self-host with your own API keys from any of 75+ supported providers. An optional managed model service called OpenCode Zen is available with token-based pricing for developers who prefer a curated, pre-benchmarked set of models.
Does OpenCode work with VS Code?
Yes. OpenCode is available as a VS Code extension in addition to its terminal TUI interface and desktop app. You can use whichever surface fits your workflow best.
How does OpenCode compare to GitHub Copilot?
GitHub Copilot focuses on inline code completion within IDEs and is a managed cloud service tied to GitHub/Microsoft infrastructure. OpenCode is an open source agentic tool that works across the terminal, desktop, and IDE, supports 75+ LLM providers, stores no code server-side, and can even reuse your existing Copilot or ChatGPT Plus subscriptions. Copilot is better for keystroke-level inline completions; OpenCode is better for multi-step agentic tasks and model flexibility.
Can I use OpenCode with local AI models?
Yes. OpenCode supports local model inference through providers like Ollama and any other Ollama-compatible runtime. This makes it suitable for fully offline, air-gapped, or maximum-privacy development environments where no data leaves your machine.
