Mystery model Ox Alpha tops GPT-5.6 — sleuths say it's Zhipu's GLM
A nameless model dropped onto OpenRouter and immediately out-scored the biggest names in coding — and the detective work on its identity is as interesting as the model itself.
Ox Alpha, an anonymous "stealth model" that appeared on OpenRouter on August 20, is posting coding-test scores above GPT-5.6 Sol, and community forensics point hard at a Chinese flagship nobody has officially announced yet. OpenRouter lists it as a reasoning model built for coding, sustained agentic work and production workloads, with a 1-million-token context window (1,048,576 to be exact), 131K-token output, text plus native image and video input, and a price tag of zero during the preview — meaning the open-source coding agent OpenCode plugged it in the same day and provisioned roughly 100 trillion tokens a day of free capacity behind it.
Within hours the field was running it ragged. Independent researcher Ben Davis put it through 10 subtasks of the DeepSWE software-engineering benchmark and got an ~80% pass rate — well clear of Claude Fable 5's 65%, GLM-5.3 and Grok 4.6 at 62%, and GPT-5.6 Sol at 52%. None of that is official yet; Davis's run isn't on the DeepSWE leaderboard, and OpenRouter won't say who built the thing. So the community turned to fingerprinting: matching its tokenizer against known models (identical raw token counts to GLM-5.3, plus a fixed offset), comparing vision-encoder token budgets on scripted test videos (a perfect match with Zhipu's GLM-5V-Turbo on three independent design choices), and checking "dirty token" reactions, emoji density, and its ~117 agent steps per task versus GLM-5.3's 124. Davis's verdict sits at roughly 99% that Ox Alpha is Zhipu's GLM-5.x family — a multimodal GLM-5.3V or the next-gen GLM-5.5 — though Zhipu, Xiaomi, Tencent and even Google were all floated as suspects first.
The bigger pattern here is that stealth launches are quietly becoming the Chinese labs' go-to way into the overseas developer market. Ox Alpha is the fifth anonymous model OpenRouter has carried, and every prior one turned out Chinese: Pony Alpha became Zhipu's GLM-5, Hunter Alpha was Xiaomi's MiMo-V2-Pro, and Owl Alpha was Meituan's LongCat. An anonymous debut gets real-world feedback at scale without the brand baggage, then converts a mystery into a two-wave launch — first the model, then the reveal. With OpenRouter itself reportedly nearing a Stripe acquisition worth over $7 billion, the gateway to this traffic is also changing hands. The free preview window likely closes around August 27; keep an eye out for whichever lab steps out from behind the curtain before then.
Who do you think is behind Ox Alpha — Zhipu, or someone else entirely? Tell us in the comments.
Sources: OpenRouter stealth model page · OpenCode · MIT Technology Review China · NetEase News · Ox Alpha community forensics
