Rumour: the anonymous model that just topped a coding benchmark, for free, is said to be Zhipu's unreleased flagship
A model called Ox Alpha appeared on OpenRouter on 20 August under an anonymous provider labelled only "Stealth" — free for a week, with a 1,048,576-token context window, up to 131,072 tokens of output, and text, image and video input. Third-party testers reported it scoring 80% pass@1 on the DeepSWE coding benchmark, ahead of Claude Fable 5 at 65%, GLM-5.3 at 62% and GPT-5.6-sol at 52%. On 21 August a technical researcher, Ben Davis, published a fingerprint analysis saying he is "99% certain" the model is an unreleased member of Zhipu's GLM-5 family: video-encoder token consumption identical to GLM-5V-Turbo, a tokenizer matching GLM-5.3 apart from a fixed 75-token wrapper, the same refusal behaviour on audio input, and a comparable emoji rate in its output. He says the analysis rules out Xiaomi MiMo, DeepSeek, Google, Qwen, xAI, OpenAI and Anthropic. None of this is confirmed. Zhipu has not commented, OpenRouter has not named the provider, and the benchmark figures come from individual testers rather than a published evaluation. Note also that OpenRouter's own model page says prompts and completions sent to Ox Alpha are retained by the anonymous provider, though not used for training. AI Minute reported a separate unconfirmed rumour on 5 August that Zhipu would ship GLM-5.5 in August; that model has still not appeared.
⚠ Unverified rumor — treat with caution
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