TL;DR
A powerful anonymous AI model called “Hunter Alpha” that appeared on OpenRouter on 11 March and sparked widespread speculation about DeepSeek V4 has been revealed as Xiaomi’s MiMo-V2-Pro. The model, built by a team led by former DeepSeek researcher Luo Fuli, is designed as the “brain” of AI agents and surpassed one trillion tokens in usage during its anonymous testing period.
From Mystery to Reveal
Hunter Alpha surfaced on the AI gateway platform OpenRouter without developer attribution, described only as a “stealth model.” Its specifications — one trillion parameters and a one-million-token context window — closely matched expectations for DeepSeek’s anticipated V4 model, which Chinese media outlets had reported could launch as early as April.
During Reuters testing, the chatbot identified itself as “a Chinese AI model primarily trained in Chinese” with a knowledge cutoff of May 2025 — the same as DeepSeek’s own system. When asked about its creator, it declined to answer, further fuelling the speculation.
The reveal came from Xiaomi’s AI model team MiMo, led by Luo Fuli. “I call this a quiet ambush — not because we planned it, but because the shift from chat to agent paradigm happened so fast, even we barely believed it,” Luo wrote on X.
Why Stealth Launches Matter
Anonymous model releases are becoming a pattern in China’s AI sector. In February, an anonymous model called “Pony Alpha” appeared on OpenRouter before Chinese firm Zhipu AI confirmed it as part of its GLM-5 system five days later. The approach lets developers collect unbiased feedback without brand expectations influencing assessments.
Hunter Alpha’s rapid adoption — topping OpenRouter’s leaderboard and surpassing one trillion tokens in total usage — demonstrated genuine demand for large-context agent-focused models. Xiaomi’s Hong Kong-listed shares rose as much as 5.8% following the announcement.
Agent-First Design
MiMo-V2-Pro is specifically designed to power AI agents — tools that execute complex tasks with less human supervision than traditional chatbots. The model will partner with five major agent frameworks, including the rapidly adopted open-source OpenClaw framework, offering developers a week of free access.
Looking Forward
The reveal positions Xiaomi as a serious competitor in China’s crowded AI field, alongside DeepSeek, Zhipu, and Alibaba’s Qwen. For international developers, it adds another high-capability open model to the growing roster of Chinese AI systems. The real DeepSeek V4 remains unreleased, meaning the speculation — and the competitive pressure — will only intensify.