Stealth OpenRouter Model 'Space Bunny' Revealed as MiniMax M3.1 Flash
The viral stealth model 'Space Bunny' on OpenRouter has been officially identified as MiniMax M3.1 Flash, featuring a multimodal 428B total and 23B active parameter architecture with a 1M context window and an open-weights release scheduled for Thursday. This revelation provides the local LLM community with access to a top-tier performer that previously dominated the OpenRouter leaderboards anonymously, offering high-performance multimodal capabilities for local deployment and API usage. The model utilizes a Mixture-of-Experts architecture with 428B total and 23B active parameters, handling text, image, and video modalities, with expected quantized model sizes fitting into high-end hardware like 256GB Mac Studio setups.
## BACKGROUND
OpenRouter is an API routing platform that aggregates various commercial and open models, occasionally hosting unnamed or stealth models for testing. Mixture-of-Experts (MoE) models scale total parameters for stored knowledge while activating only a subset per token to maintain high inference speeds, and quantization reduces model precision to lower hardware requirements.