What Is MiMo-V2-Pro? Xiaomi's Trillion-Parameter AI Model Explained

MiMo-V2-Pro is a large language model built by Xiaomi — yes, the phone company. It has over 1 trillion total parameters, a 1 million token context window, and it's specifically designed for autonomous AI agent tasks. It launched on March 18, 2026, after a week of anonymous stealth testing on OpenRouter under the codename "Hunter Alpha." If you've been following AI news, you probably heard about the mystery model that everyone thought was DeepSeek V4. It wasn't. It was Xiaomi. The basics MiMo-V2-Pro is a mixture-of-experts (MoE) model. That means it has 1 trillion total parameters split across many "expert" sub-networks, but only activates 42 billion parameters for any given request. This is the same architectural approach used by DeepSeek V3 and Mixtral — it delivers near-frontier performance at a fraction of the compute cost. Spec Value Total parameters ~1 trillion Active parameters 42 billion (MoE) Context window 1 million tokens Max output 32,000 tokens Architecture Hybrid attention