Ox Alpha, an unidentified AI model that recently appeared on OpenRouter as a “stealth model”, is drawing attention from developers because of its large context window and multimodal capabilities. The system can process text, images and video and has been offered free with near-unlimited usage for a week. Its anonymous launch has triggered speculation over who built it and why.

Anonymous AI model Ox Alpha launched on OpenRouter with a 1M token context window and multimodal support. Community sleuths trace it to Zhipu

New AI model Ox Alpha reportedly outperforms Claude Fable 5 and GPT-5.6 Sol. Anthropic best model by September 2026 at 89.5% YES.