Cloudflare's documentation describes Union Alpha as a blended AI model that runs multiple language models in parallel for each request and synthesizes one answer. It lists support for text and vision inputs. On September 16, 2026, OpenCode advertised Union Alpha as a stealth model built for coding agents, with no data training and free access for the following week. One user who initially guessed it was GLM 5.4 later withdrew that identification, saying the wrong model had been served. The same user subsequently described Union Alpha as a router, linking to Cloudflare's documentation.