Who is behind Union Alpha, the mysterious new frontier LLM on OpenRouter?

Question

“Union Alpha,” an anonymous “stealth” model that appeared on OpenRouter earlier today (September 16, 2026).

[tweet]OpenRouter claims it sets a new frontier on cost effectiveness on DeepSWE:

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Manifold Markets · Answer

Per Manifold Markets prediction market, Xiaomi (MiMo company), followed by Z.ai / Zhipu AI (GLM company) and Moonshot AI (Kimi company) are most likely. See the market for live updates (7 traders, as of Sep 16, 2026).

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