Union Alpha confirmed as Pareto 26.9 model router, not a new model
The author, initially skeptical of Hermes' multi-model theory, says Cloudflare documentation confirms Union Alpha was a routing system called Pareto 26.9, and laments that the stealth phase ended so quickly.

Turns out Detective Hermes was right! I was very skeptical of Hermes' multi-model theory, but it was announced today that Union Alpha was a model routing system called Pareto 26.9 by @TheUnbiasedCo Hermes noticed that it worked like a combination of multiple models I've tested, so with that (and some pretty strong Cloudflare doc evidence), it came to the conclusion that is was routing multiple models Disappointing that the stealth phase ended so quickly (and with so many connectivity issues) and that it ended up being just a model router, not some cool new open weights model, but the mystery is solved!
This post quotes another post: “Tonbi's Hermes comparison suggests Union Alpha is not a single model”