Free Unlimited AI in VS Code: OpenCode Zen Extension Adds 30+ Models to GitHub Copilot Chat (No Subscription)

🆓 FREE UNLIMITED AI · VS CODE · @aibreakfeed

Use Unlimited Free AI Models Inside VS Code Copilot Chat — Zero Subscription Needed

The OpenCode Zen VS Code Extension is the hack developers have been waiting for — bring any AI model into GitHub Copilot for free.

✍️ AI Break Feed  ·  📅 June 2026  ·  ⏱️ 5 min read

🆓
100% Free
30+
AI Models
866+
Installs
MIT
Open Source
∞
Free Requests

WHAT IS THIS EXTENSION?

OpenCode Zen in VS Code — The Free Copilot Upgrade Nobody Told You About

If you use VS Code as your editor and you have been paying for GitHub Copilot Pro just to access better AI models in the chat panel — stop. Right now. Because there is a free, open-source VS Code extension that plugs OpenCode's entire model library directly into your Copilot Chat interface, and it costs you absolutely nothing.

The extension is called OpenCode Zen Provider, published on the VS Code Marketplace by developer wienans. It connects to OpenCode's Zen API and registers all available Zen models — including fully free ones — as first-class options in your VS Code Language Model picker. That means you can switch from GitHub Copilot's default model to DeepSeek, MiMo, or any Zen model with a single click inside the same chat panel you already use.

💡 The big deal: No Copilot Pro subscription required. No credit card. No API bill. If no API key is configured, the extension automatically uses apiKey: public and surfaces only the free Zen models — giving you unlimited access to them for free.

GitHub Copilot Chat in VS Code with model picker

GitHub Copilot Chat in VS Code — the same panel where OpenCode Zen models appear after installing the extension.

THE REAL COST OF COPILOT

Why Developers Are Looking for Copilot Alternatives in 2026

Here is something Microsoft does not advertise loudly: the AI model inside GitHub Copilot Free is limited. You get basic suggestions and a capped number of Copilot Chat messages per month. To unlock better models and unlimited chat, you need Copilot Pro at $10/month or higher.

For individual developers, freelancers, and students — especially those in India and other markets where $10/month feels steep — that is a real barrier. And even if you are paying for Pro, you are still locked into whichever models Microsoft decides to serve you.

"What if you could use DeepSeek V4, MiMo V2.5, or Xiaomi's latest coding model inside VS Code's Copilot Chat panel — for free — right now?"

That is exactly what the OpenCode Zen extension makes possible. It uses VS Code's official Language Model Chat Provider API — the same mechanism that lets Copilot plug in models — to register OpenCode's entire Zen model library as selectable options in your model picker. You get all that capability without touching your Copilot subscription at all.

HOW IT WORKS

The Technical Magic Behind the Extension

VS Code version 1.104 and above exposes a Language Model Chat Provider API. This is an official, blessed API that lets third-party extensions register their own AI models as providers inside VS Code's native chat panel — the same panel GitHub Copilot uses. OpenCode Zen Provider is built precisely on top of this API.

Here is the flow:

1. You install the extension from the VS Code Marketplace.
2. The extension fetches the full model list from https://models.dev/api.json — filtered to the OpenCode provider — and registers each one in VS Code's model picker.
3. If you have no API key configured, it defaults to apiKey: public — this unlocks all free Zen models automatically with no sign-up needed.
4. If you set an OpenCode API key (free to create at opencode.ai/auth), you get the full model library including paid and premium Zen models.
5. Tool calling is fully supported — the AI can read files, search your codebase, and run commands through VS Code's agent system using any Zen model you pick.

The API key is stored in VS Code's SecretStorage — not in your settings.json — so it never accidentally ends up in a Git commit.

VS Code Language Model Chat Provider BYOK API explanation

VS Code's Language Model Chat Provider API — the same mechanism the OpenCode Zen extension uses to plug models into Copilot Chat.

STEP-BY-STEP INSTALL

How to Set It Up in Under 3 Minutes

You need VS Code 1.104 or newer. That's the only real requirement. Here's the full setup:

Step 1 — Install the Extension
Open VS Code and press Ctrl+P (or Cmd+P on Mac) to open Quick Open. Paste this command and hit Enter:
ext install wienans.opencode-zen-chat-provider
Or search "OpenCode Zen Provider" in the Extensions marketplace sidebar and click Install.
Step 2 — Use Free Models (No API Key Needed)
Open Copilot Chat (Ctrl+Shift+I). Click the model picker at the top of the chat panel. You will now see OpenCode Zen free models listed. Select any one and start chatting. No API key, no sign-up — just free AI.
Step 3 — Unlock All Models (Optional — Add API Key)
Open the Command Palette (Ctrl+Shift+P) and run OpenCode Zen: Set API Key. Get your free API key at opencode.ai/auth. The key is stored in SecretStorage — never in plain text or settings files.
Step 4 — Refresh & Pick Your Model
Run OpenCode Zen: Refresh Model List from the Command Palette to fetch the latest models. Then click the model picker in Chat and select any OpenCode model. The list auto-updates on every VS Code startup — new models appear automatically.
Command Palette Commands (Ctrl+Shift+P) 
# Set your OpenCode API key securely
OpenCode Zen: Set API Key

# Clear the API key (reset to free public mode)
OpenCode Zen: Clear API Key

# Refresh and fetch latest models from OpenCode
OpenCode Zen: Refresh Model List

# Run a self-test to verify tool calling works
OpenCode Zen: Self Test

FREE MODELS RIGHT NOW

These Models Are Free — Use Them Unlimited in VS Code Today

When you use this extension without an API key (public mode) or through a free OpenCode account, these models are available at zero cost with unlimited requests during their free periods:

Model Made By Strengths Cost
🧠 Big Pickle OpenCode Stealth coding model, optimised for agents FREE ∞
⚡ DeepSeek V4 Flash Free DeepSeek AI Ultra-fast, great for quick code tasks FREE ∞
🤔 MiMo-V2.5 Free Xiaomi AI Reasoning + tool calling + vision (131K ctx) Michael Elkan