What is known about Ox Alpha, the AI model that beat world's most powerful models?

A new stealth AI model named Ox Alpha has been released on OpenRouter, but details on who created the model are yet unknown. The model was reportedly built by Zhipu AI as it's allegedly being served through the Chinese startup's infrastructure. The model was able to beat the world's most powerful models, Claude Fable and GPT-5.6 Sol, in coding capabilities.