OpenRouter's Mystery Union Model Reverse-Engineered: Likely a Qwen4 MoE
unsane_imagination · reddit · 2026-09-17
- A Reddit user ran tokenizer and cutoff tests on Union, a new free stealth model on OpenRouter: 99% identical tokenizer to Qwen3/3.5/4, 256k context, and a training cutoff around Dec 2025-Jan 2026.
- Subjectively it beats qwen3.6 35B A3B and the Nex n2.5 mini built on it, and competes with qwen3.8 27b; reasoning is hidden, suggesting closed weights. The author suspects it's the new small Qwen4 MoE, while cautioning they over-hyped ox stealth before (which turned out to be glm5.3flash). If it's really a 30-40B Qwen4 MoE, it could rip at 25 tok/s on a 16GB M4 with aggressive quantization.
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