OpenCode Zen Review: Free AI Models for Coding That Actually Work
What Is OpenCode Zen?
OpenCode Zen is the built-in model gateway from the OpenCode team — the open-source AI coding agent. Think of it as a curated gateway to AI models where several of them are completely free to use, no credit card required.
While premium models (GPT-5.5, Claude variants) run on pay-as-you-go pricing, Zen also offers a rotating lineup of free models that are surprisingly capable for everyday coding tasks.
The Free Model Lineup
The current free models on OpenCode Zen include:
- gpt-5-nano — OpenAI's compact model, quick responses
- MiniMax M2.5 Free — arguably the best of the free tier; strong general coding ability
- DeepSeek V4 Flash Free — fast, great for routine edits and boilerplate
- Nemotron 3 Super Free — NVIDIA's model, solid reasoning for its class
- Ling 2.6 Flash Free — lightweight and quick
- Hy3 Preview Free — experimental preview model
- Big Pickle — community favorite for creative tasks
Important: the free lineup rotates. Models are offered "for a limited time" while the team collects feedback, so don't build your workflow around any single free model staying forever.
Why It Beats the Alternatives
| Setup | Cost | Setup Time |
|---|---|---|
| OpenCode Zen (free models) | $0 | ~2 minutes |
| Ollama + local models | $0 + GPU | 30+ minutes |
| Claude Code + API | $3–15/M tokens | 5 minutes |
| GitHub Copilot | $10/month | 5 minutes |
For developers who want AI-assisted coding without subscriptions, it's the fastest path to $0 cost. No hardware requirements, no Ollama setup, no API keys to manage.
How to Get Started
- Install OpenCode (one command, works on Linux/macOS/WSL)
- Run
opencode— Zen is the default provider, zero setup needed - Use
/modelsto switch between free models - Start coding
That's it. The OpenAI-compatible API also means you can integrate Zen into your own tools and agents — I've been testing it with automated workflows and the free models handle structured tasks well.
The Catch
Free models have limits — that's fair. They're best for:
- Routine refactors and code reviews
- Boilerplate and scaffolding
- Learning and experimentation
- CI/automation tasks where speed matters more than peak intelligence
For complex architecture work, you'll still want a premium model. But for everything else? Free is hard to beat.
Verdict
If you write code and haven't tried OpenCode Zen's free models, you're leaving free productivity on the table. It's the rare "free tier" that's genuinely useful rather than a teaser.
Try it: opencode.ai/docs/zen