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🚀 OpenCode for GitHub Copilot Chat

Use 30+ frontier AI models (DeepSeek V4, Kimi K2.6, GLM-5.1, GPT-5.5, Claude Opus 4.7, Gemini 3.5, Grok…) in GitHub Copilot Chat — BYOK

Bring Your Own Key (BYOK) · OpenCode Zen (free + paid models) or Go ($10/mo subscription) · Works with native Copilot Agent Mode

✨ Why you'll love it · ⚡ Quick Start (60 sec) · 🧠 Models · 📊 Compare · 🔧 Settings · ❓ FAQ · 💬 Community

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💡 The elevator pitch

Copilot Chat is great — but its premium models cost $39/mo (Pro+), and the free tier is rate-limited. This extension plugs OpenCode's model gateway into Copilot Chat's model picker. OpenCode Zen gives you 2-5 rotating free models (Big Pickle is always free; DeepSeek V4 Flash, MiMo-V2.5, and others rotate) plus paid models like Claude Opus, GPT-5.5, and Gemini at pay-as-you-go rates. OpenCode Go ($10/mo, $5 first month promo) gives you a curated set of open models (DeepSeek V4 Pro, Kimi K2.6, GLM-5.1, Qwen3.7 Max, MiMo V2.5 Pro) with generous usage limits. You keep the native Copilot UI, tool-calling, and Agent Mode — you just get way more models, often cheaper than Copilot Pro+.

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🔥 Why you'll love it

| | What you get | | -------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | 💸 Cheaper than Copilot Pro+ | VS Code + OpenCode Zen free models = $0 for 2-5 rotating models (Big Pickle always free; DeepSeek V4 Flash, MiMo-V2.5, and others rotate). Paid Zen models (Claude Opus, GPT-5.5) available at pay-as-you-go rates. Go subscription $10/mo ($5 first month) | | 🌍 30+ frontier models | DeepSeek V4, Kimi K2.6, GLM-5.1, Qwen3.7 Max, MiMo V2.5, MiniMax M2.7, Big Pickle, Nemotron — all in one picker | | 🤖 Full Agent Mode | Tool-calling (read files, edit, run terminal) works natively — not just chat. Models also appear in the Agents window (Copilot CLI session) | | 🧠 Thinking controls | Per-model reasoning effort (DeepSeek max, Qwen thinking_budget, MiniMax on/off, Mimo low/med/high) | | 🖼️ Vision proxy | Text-only models can "see" images via a configured vision model. Run OpenCode Go: Configure Vision Proxy from the Command Palette to set it up. | | 📊 Live usage tracking | Status bar shows Go subscription burn-rate across 5h / weekly / monthly tiers | | 🔌 Dual providers | OpenCode Go ($10/mo subscription) + OpenCode Zen (free + paid models) — run both at once, switch instantly | | 🎯 Smart routing | Each model family auto-routes to its native transport (/responses, /messages, streamGenerateContent, /chat/completions) | | 🖼️ Vision + PDF + Audio | Multimodal models pass through image, PDF, audio, and video inputs. Oversized images auto-resize to 2000×2000 / 5MB to match the gateway contract. | | 📐 Context-size picker | Kimi K3 and other tiered-context models expose 256K vs full-window selection in the per-model configuration, with the cheaper tier selected by default. | | 🔒 Your key, your control | API key stored in VS Code SecretStorage — never leaves your machine |

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⚡ Quick Start (60 sec)

1.  Install or update VS Code 1.125+ ────────────────────────────── ✓
2.  Install this extension ──────────────────────────────────────── ✓
3.  Get an OpenCode Zen API key → opencode.ai/auth ─────────────── ✓
4.  Open Copilot Chat → click model → "Add Models" → OpenCode Zen ── ✓
5.  Paste API key → pick a free model → CHAT 🎉

<details> <summary><b>📖 Detailed step-by-step with screenshots</b></summary>

1. Install or update VS Code to version 1.125 or newer. OpenCode BYOK chat works without a GitHub sign-in or Copilot plan.
2. Install this extension from the VS Code Marketplace (or press F5 in this repo for dev mode).
3. Get an API key:
   • Free models: Sign up at opencode.ai → grab an OpenCode Zen key. 2-5 models are truly free (Big Pickle is always free; DeepSeek V4 Flash Free, MiMo-V2.5 Free, and others rotate).
   • Paid Zen models (optional): Add a payment method to your Zen account to unlock Claude Opus, GPT-5.5, Gemini, and other paid models at pay-as-you-go rates. Adding $20+ balance also improves rate limits on free models.
   • OpenCode Go (optional): Subscribe to OpenCode Go ($10/mo, $5 first month promo) for curated open models like DeepSeek V4 Pro, Kimi K2.6, GLM-5.1, Qwen3.7 Max, MiMo V2.5 Pro.
4. Open Copilot Chat (Cmd/Ctrl+Shift+I, or click the Copilot icon).
5. Click the model picker (current model name) → Add Models…
6. Select OpenCode Go or OpenCode Zen.
7. Press Enter to accept the default group name.
8. Paste your API key when prompted (stored securely in VS Code SecretStorage).
9. Pick the models you want enabled.
10. Select any OpenCode model from the picker and start chatting. 🚀

💡 Tips:

• Go and Zen are separate provider groups — both can be active simultaneously. Switch anytime from the picker.
• If a model shows in Language Models view but not the chat picker, hover its row and click the eye icon (👁) to enable it.
• Set opencodego.freeOnly: false to reveal paid Zen models in the picker.

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🎬 Demo

<p align="center"> <img src="docs/screenshots/model-picker.gif" alt="Copilot Chat model picker showing OpenCode models" width="480" /> </p>

Selecting an OpenCode model from the Copilot Chat model picker.

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🧠 Models

The extension fetches live model lists on every startup from:

| Provider | Endpoint | Cost | | ---------------- | -------------------------------------- | ----------------------------------------------------------------------------- | | OpenCode Go | https://opencode.ai/zen/go/v1/models | $10/mo ($5 first month promo) — usage limits: 5h/$12, weekly/$30, monthly/$60 | | OpenCode Zen | https://opencode.ai/zen/v1/models | 2-5 rotating free models + pay-as-you-go for premium models |

⭐ OpenCode Go (subscription — $10/mo, $5 first month promo)

| Model | Context | Max Output | Highlights | | --------------------------------------- | ------------: | ---------: | --------------------------- | | deepseek-v4-pro / deepseek-v4-flash | 1,000,000 | 384,000 | 🧠 Reasoning off→max | | qwen3.7-max | 1,000,000 | 65,536 | 🧠 thinking_budget 4K–82K | | mimo-v2.5-pro / mimo-v2-pro | 1,048,576 | 128,000 | 🧠 Effort low→high