Ox Alpha is the seventh stealth model to appear on OpenRouter since spring 2025. The previous six followed a pattern consistent enough to be called a playbook — and that playbook is the best guide available to what happens next, because the developer itself is saying nothing.
The pattern
Each stealth model so far has been listed under OpenRouter’s anonymous “Stealth” provider with a codename ending in Alpha — sometimes two codenames at once, as with the Quasar/Optimus and Sonoma Sky/Dusk pairs, and the Hunter/Healer pair. Each has been free during its preview. And each has eventually been revealed as a named model from a real lab. The complete list, with every revealed identity, is in the reveal history table; in short, the six earlier reveals were spread between April 2025 and June 2026 and came from several different developers.
Why labs do this
A stealth preview gives a lab something benchmarks cannot: real traffic from real users, on real tasks, with no brand expectations attached. Developers who would never sign up for a closed beta will happily hit a free model with a million-token context. In return for the traffic, the lab offers the preview at $0 and accepts that the internet will spend the week trying to guess who they are.
The guessing game is part of the pattern too. Every previous stealth model attracted fingerprinting attempts — comparisons of tokenizer quirks, refusal style and formatting habits against known models — and Ox Alpha is no exception. Analyses shared by testers currently point toward the GLM family, with a minority view suggesting Xiaomi’s MiMo line. As always, those are the testers’ claims, not confirmed facts; we keep the evidence on the identity page.
What the precedents tell us about Ox Alpha
1. A reveal is the norm
Six out of six previous stealth models were eventually announced under an official name. There is no precedent for a stealth model simply vanishing without identification. Expect an announcement.
2. The free window closes
Stealth pricing is $0 because the model is pre-release. Once revealed, the model is typically listed under its own name with ordinary pricing. For Ox Alpha the preview is expected to end around August 27, 2026 — an expectation, not a commitment from anyone. If you want to evaluate it for free, the time is now.
3. The codename disappears
After a reveal, the stealth/… listing is replaced by the official model ID. Anything you build against stealth/ox-alpha should have a fallback. (Our own browser chat switches models automatically if the listing goes away.)
4. Speculation is still speculation
The history table lets you compare codenames with revealed identities yourself. The lesson is not that fingerprinting is useless — it is that a 95% confidence figure from a tester is still a guess until the lab speaks.
What we are watching
- The listing itself. Our tracker re-reads OpenRouter’s public model list twice a day and flags any change in pricing, name or availability.
- An announcement. From the developer, or from OpenRouter.
- New third-party results. Anything beyond the single 10-task coding sample reported so far.
When the reveal comes, this site will update the tracker, the identity page and the chat the same day, and keep covering the model under its real name.