Short answer: nobody knows officially. Ox Alpha is published on OpenRouter by the anonymous “Stealth” provider, and OpenRouter has said nothing about who built it — it only routes the model. Everything below the next heading is reporting on what independent testers claim, not confirmed fact. We will replace this page with the official answer the moment there is one.
What is actually confirmed
- The model appeared on OpenRouter on August 20, 2026 as
stealth/ox-alpha. - The provider is listed as “Stealth”. No developer, company, or country is named.
- There are no open weights, no model card from a lab, and no official benchmarks.
- The listing describes it as a reasoning model built for coding, sustained agentic work, and production workloads, with 1,048,576 tokens of context and text, image and video input.
The leading theory: a GLM-family model
Since the listing appeared, testers have been running fingerprinting checks — comparing Ox Alpha’s tokenizer behaviour, refusal style, formatting habits, and responses to probing prompts against known models. Several of these analyses, shared publicly by the people who ran them, report a strong match to Zhipu’s GLM family, with confidence figures quoted anywhere from roughly 90% to 99%.
Two caveats matter. First, those confidence numbers are the testers’ own; there is no independent validation. Second, fingerprinting can be fooled by shared training data, distillation, or deliberate style tuning. It is suggestive, not conclusive.
The minority theory: Xiaomi MiMo
A smaller group of testers has pointed to Xiaomi’s MiMo line instead, largely on the basis of the multimodal input support and the coding focus. This view has less published evidence behind it than the GLM theory, but it has not been ruled out.
What the precedents suggest
Stealth previews on OpenRouter have come from several different labs, and every one of them was eventually revealed. The reveal history table lists each codename and its official identity. The pattern tells you a reveal is very likely; it does not tell you who.
How we will handle the reveal
When the developer announces Ox Alpha’s official name, we will update this page, the tracker, and the chat banner on the home page the same day, and note which theory turned out to be right. Until then: the developer is unconfirmed, and any article stating otherwise as fact is ahead of the evidence.
FAQ
Is Ox Alpha made by OpenRouter?
No. OpenRouter is a routing platform. It hosts stealth previews on behalf of labs that want anonymous real-world testing.
Has Zhipu or Xiaomi commented?
Not as of our last update. Neither company has confirmed or denied involvement.
Is it a version of ChatGPT, Claude, or Gemini?
The published fingerprinting analyses do not point to those families. But again, nothing is confirmed.