A Practitioner Fingerprinted the Anonymous Ox Alpha Model and Found GLM-5.3's Tokenizer, While a DeepMind Researcher Hinted Gemini

r/singularity (205 upvotes; corroborated by OpenRouter's launch post and a second r/singularity thread at 142 upvotes)·high signalXBlueskyLinkedInCopy link

Three black-box tests posted to r/singularity found stealth/ox-alpha on OpenRouter returns prompt_tokens exactly +75 above public GLM-5.3 on all six test texts (EN/DE/CN/code/emoji), returns z.ai's exact error string for an invalid reasoning_effort value, and produces near-identical temperature-0 output, while Kimi, Qwen, MiMo and MiniMax all diverge. Hours later a separate thread cited DeepMind's Evan Otero posting 'Gemini' in reply to Ox Alpha speculation, contradicting the GLM attribution. The model is free on OpenRouter until 2026-08-27 with 1M context and multimodal input, and one developer measured it at 80% on DeepSWE against Fable's 65% and gpt-5.6-sol's 52%.