OpenRouter has once again launched the mysterious model Union Alpha, specializing in Agent programming.

Beating AI News Flash: OpenRouter and OpenCode have launched a mysterious model, Union Alpha, with the developer's identity not yet disclosed. It is a multimodal model designed for research, coding, and Agent workflows, supporting images, tool calls, and approximately 256K context. OpenRouter describes it as having "frontier-level general performance."

OpenCode states that Union Alpha is specifically optimized for Agent coding, will be free to use for the next week, and will not train models on user data.

Who exactly is behind Union Alpha remains unanswered. The community has already begun guessing the model's identity based on clues such as output style and context length, but there is no reliable evidence yet.