OpenCode and Crush

Open-source, multi-provider terminal AI coding agent written in Go. OpenCode (MIT, ~12K stars) was archived mid-2025 and succeeded by Crush from Charmbracelet (~23K stars). Same lead developer, same architecture, production backing from the Charm team.

Status: OpenCode is archived. Crush (https://github.com/charmbracelet/crush) is the active successor.

---

Why This Matters

OpenCode/Crush occupies a unique position: it’s the only mature open-source terminal coding agent with multi-provider support, local model compatibility, and LSP integration. For teams that need:

• Provider flexibility – switch between Anthropic, OpenAI, Google, Groq, or self-hosted models
• Self-hosted/air-gapped environments – works with any OpenAI-compatible endpoint (Ollama, vLLM)
• No vendor lock-in – MIT license, full source access
• GitHub Copilot subscription reuse – can use existing Copilot tokens as a provider

---

Quick Facts

Property	Value
OpenCode Repo	https://github.com/opencode-ai/opencode (archived)
Crush Repo	https://github.com/charmbracelet/crush (active)
License	MIT
Language	Go (single binary, no runtime dependencies)
TUI Framework	Bubble Tea (Charmbracelet)
Stars	OpenCode ~12K, Crush ~23K

---

Architecture

+------------------------------------------+
|              Terminal UI (Bubble Tea)     |
|  Editor | Chat | Logs | Sessions         |
+------------------------------------------+
|              Agent Layer                 |
|  Coder Agent | Task Agent | Title Agent  |
+------------------------------------------+
|              Tool Layer                  |
|  bash | glob | grep | ls | view | write  |
|  edit | patch | diagnostics | fetch      |
|  sourcegraph | agent (sub-tasks)         |
+------------------------------------------+
|              Provider Layer              |
|  OpenAI | Anthropic | Google | Groq      |
|  Bedrock | Azure | Copilot | Local       |
+------------------------------------------+
|              Storage (SQLite)            |
+------------------------------------------+

Each agent can be assigned a different model, enabling per-task model routing natively.

---

Multi-Provider Support

Supported Providers

Provider	Models	Auth
Anthropic	Claude 4 Opus/Sonnet, 3.7/3.5 Sonnet, 3.5/3 Haiku	ANTHROPIC_API_KEY
OpenAI	GPT-4.1, GPT-4.5, GPT-4o, O1/O3/O4-mini	OPENAI_API_KEY
Google Gemini	Gemini 2.5 Pro/Flash, 2.0 Flash	GEMINI_API_KEY
GitHub Copilot	GPT-4/4o/4.1, Claude 3.5/3.7/4, Gemini 2.0/2.5	GITHUB_TOKEN
Groq	Llama 4 Maverick/Scout, QWQ-32b, Deepseek R1	GROQ_API_KEY
Local/Self-hosted	Any OpenAI-compatible endpoint	LOCAL_ENDPOINT

Per-Agent Model Assignment

{
  "provider": "anthropic",
  "models": {
    "coder": {
      "provider": "anthropic",
      "model": "claude-sonnet-4-6"
    },
    "task": {
      "provider": "groq",
      "model": "llama-4-maverick-17b-128e"
    },
    "title": {
      "provider": "groq",
      "model": "llama-3.3-70b-versatile"
    }
  }
}

Use Claude for the main coding agent (precision), Llama on Groq for sub-tasks (fast + cheap), and the cheapest model for session titles.

---

Key Features

TUI with Vim Keybindings

Shortcut	Action
i	Focus text editor
Esc	Unfocus editor
Ctrl+O	Switch model mid-session
Ctrl+A	Switch session
Ctrl+K	Command palette

Built-in Tools

bash, glob, grep, ls, view, write, edit, patch, diagnostics (LSP), fetch, sourcegraph, agent (sub-tasks).

LSP Integration

Connects to language servers and exposes diagnostics to the AI. When the AI makes a change, it automatically gets linting errors and type check failures.

MCP Support

Full MCP (Model Context Protocol) support with stdio and SSE transports.

---

OpenCode vs Claude Code vs Copilot CLI

Dimension	OpenCode / Crush	Claude Code	Copilot CLI
License	MIT (open source)	Proprietary	Proprietary
Multi-provider	10+ providers + local	Anthropic only	GPT/Claude/Gemini
Local models	Yes	No	No
Per-agent model routing	Yes (works today)	N/A	In spec, ignored in CLI
LSP integration	Yes	No	No
Session persistence	SQLite, multi-session	File-based	No
Cost	Free + API keys	$20/month or API	Copilot subscription
Maturity	Early (v0.x)	Production	Production

When to Choose What

Scenario	Best Tool
Deep multi-file reasoning	Claude Code
GitHub-native workflows	Copilot CLI
Multi-provider flexibility, self-hosted models	OpenCode / Crush
Air-gapped / regulated environment	OpenCode / Crush
Cost-sensitive (API keys only)	OpenCode / Crush

---

The OpenCode to Crush Transition

Aspect	OpenCode	Crush
Status	Archived (June 2025)	Active development
Maintainer	Kujtim Iihoxha (solo)	Charmbracelet team (company-backed)
Platform	macOS, Linux	macOS, Linux, Windows, FreeBSD

Migration: If your team is on OpenCode, migrate to Crush. Config format and workflow are nearly identical.

---

References

• OpenCode GitHub (archived)
• Crush GitHub
• Charm Discord