Union Alpha on OpenCode
Union Alpha has two front doors: the OpenRouter listing we can verify directly, and an OpenCode free-tier route that third parties report. This page keeps those two apart, tells you how to try the second one, and states what we cannot check from outside.
The short version
stealth/union-alpha, free, 262K context, read from the catalogue on 2026-09-17.Two front doors, one anonymous release
OpenRouter is the route we track. Its public catalogue lists stealth/union-alpha under the stealth namespace with a provider tag of “Stealth”, and it is the source every verified number on our tracker comes from.
OpenCode is the route we cannot see. The claim is that the free tier of the OpenCode coding tool serves the same anonymous model, which would let you use it inside an agentic workflow without an API key of your own. It is plausible — stealth releases are often seeded through several tools at once to gather usage — but “plausible” is not “verified”, and we are not going to report it as fact.
How to try the OpenCode route
- 1. Install and sign in to OpenCode. The free tier is the part to look for — it is the route that does not ask for your own provider key.
- 2. Look for the anonymous model in the picker. Free stealth releases often appear without a vendor name attached. If you see an unexplained model alongside the named providers, that is the thing to test.
- 3. Run one prompt you already know the answer to. The identity of the model behind an anonymous endpoint is not something it can tell you reliably, so judge it on output, not on what it says about itself.
- 4. Assume it can vanish. Keep the workflow disposable: no credentials in prompts, no customer data, no dependency your product needs tomorrow.
We deliberately do not print a screenshot-accurate click path: the free tier's menu wording changes between OpenCode releases, and a stale step-by-step would be worse than none.
How to check for yourself
| What you want to know | Where it can be checked |
|---|---|
| Is it still on OpenRouter, and still free? | Our status endpoint or the listing itself |
| Is the OpenCode free tier still serving it? | Only from inside your OpenCode client — there is no public endpoint we can poll |
| What it will cost after the preview | Unknown. See the free-window page |
FAQ
Is Union Alpha really available on OpenCode?
That is the claim, not a verified fact. OpenCode's free tier is described by third parties — including material published for the model itself — as serving the same anonymous model. Our own verification is limited to OpenRouter, where we read the catalogue directly. Treat the OpenCode route as reported-but-unconfirmed and check it yourself before relying on it.
Do I need an OpenRouter API key to use Union Alpha through OpenCode?
No. The point of the OpenCode route is that the model is reachable from its free tier without wiring up your own key. If you call it on OpenRouter instead, you do need an OpenRouter key — but not a key from the anonymous maker, who has not published one.
Is it the same model on both routes?
Reportedly yes: same anonymous release, two front doors. We cannot prove it from outside, and the model's own answers about its identity are unreliable — testers have reported inconsistent behaviour between sessions.
What should I not use Union Alpha for?
Anything with secrets or other people's data. The provider is anonymous, no privacy or retention policy has been published, and free stealth previews have historically ended without warning. Evaluation and side projects, yes; production credentials or customer data, no.
Get notified when Union Alpha is revealed
Identity, and the price once the free preview ends. One email per reveal.