OpenCode

https://opencode.ai/

$0/month (free tier with Models.dev; Go $10/month; Zen pay-as-you-go)

Three Interfaces — CLI (headless), Desktop app (Electron), and IDE extensions for VS Code and JetBrains
75+ LLM Providers — Claude, GPT-4o, Gemini 2.5, DeepSeek, Qwen, Llama via Models.dev, OpenRouter, or direct API
Model-Agnostic — Bring your own API key; no forced bundling or model subscription
Privacy-First — Explicitly does not store code or context data on external servers
Free Tier (Models.dev) — No API key required; start coding at no cost
OpenCode Go — $5 first month, $10/month thereafter for low-cost coding models
OpenCode Zen — Pay-as-you-go for premium models (Claude 4, GPT-4.1, Gemini 2.5) with validated benchmarks
OpenCode Black — Enterprise gateway with advanced controls and team management
Specialized Agents — Configurable agents for coding, planning, and code review tasks
LSP Integration — Built-in Language Server Protocol for intelligent code diagnostics and autocomplete
Multi-Session Parallelism — Run multiple agents in parallel on the same project
Session Sharing — Share a link to any session for reference or collaborative debugging
GitHub Copilot Integration — Log in with GitHub to use your existing Copilot account
ChatGPT Plus/Pro Integration — Log in with OpenAI to use your Plus/Pro account
Auto-Compact — Automatically summarizes long conversations to prevent context overflow
MCP Server Support — Connect Model Context Protocol servers for extended tooling

#1 ranked AI coding tool (June 2026 LogRocket Power Rankings)
160K+ GitHub stars, 900 contributors, 7.5M monthly active developers
Fully open source — audit, extend, self-host without restrictions
75+ LLM providers — switch between Claude, GPT, Gemini, DeepSeek freely
Privacy-first: does not store your code on external servers
Free tier with Models.dev integration — no API key required
Three interfaces: CLI, desktop app, IDE extensions
Multi-session parallelism for large projects
GitHub Copilot and ChatGPT Plus/Pro integration (bring your own account)
Auto-compact prevents context window overflow on long sessions
MCP server support for extended tooling
Cross-platform installers: curl, Homebrew, npm, scoop, pacman, Go

Desktop GUI is less polished than the CLI — terminal is the primary experience
No built-in model — you bring your own API key (or use the free Models.dev tier)
Learning curve steeper for non-terminal developers
Planning can drift on very complex multi-repository tasks
You pay your own LLM costs unless using the free Models.dev tier