Mysterious AI Model Union Alpha Revealed As Unbiased.ai's Pareto 26.9
A stealth model called Union Alpha appeared on OpenRouter on September 16, 2026, posting benchmark scores on par with GPT-6 Astra and Claude Fable 5.1. Its free trial was cut to one day. It was then identified as Pareto 26.9 from unbiased.ai, which said anonymous release was meant to test real user reaction before an official launch planned for October 10, 2026.