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MiniMax confirms Stealth AI Model “Space Bunny” is MiniMax-M3.1-Flash

Ending weeks of speculation, MiniMax confirmed that the stealth AI model Space Bunny is their frontier AI model Chinese startup MiniMax has confirmed that the anonymous stealth AI model Space Bunny is their frontier AI model MiniMax M3.1- Flash.
Logo of Chinese AI startup MiniMax latest AI model M3.1 -Flash and picture of a carrot with space bunny written over it in the background of planet earth.
October 19, 2026 05:32 PM IST | Written by Vaibhav Jha

Chinese AI startup MiniMax confirmed Monday that the anonymous stealth AI model ‘Space Bunny’, which was launched on OpenRouter and OpenCode in September, is their upcoming frontier model MiniMax M3.1- Flash.

In a post on X, MiniMax, a Shanghai based AI company, explicitly stated that Space Bunny is their upcoming MiniMax- M3.1-Flash, “Frontier multimodal coding model with 1M context window and tunable thinking depth” that comes with 1M context window.

Their official X account posted “Welcome back. Space Bunny.  MiniMax-M3.1-Flash is coming,” with a short video of a carrot-shaped rocket labeled Space Bunny that ends on a MiniMax M3.1-Flash title card. The announcement ended weeks of speculation driven by tokenizer fingerprinting that had already linked the stealth model to MiniMax’s M-series.

 

On September 23, an anonymous, free, stealth AI model Space Bunny was launched on OpenRouter and OpenCode (listed as “space-bunny-alpha”) where it offered 1-million-token context window, multimodal input (text, image, and video) with text output, mandatory reasoning with five tunable effort levels (low to max), tool calling, and high inference speed.

In less than three weeks, Space Bunny Alpha became one of the most used models on both platforms while free, popular for coding, agent workflows, and long-context tasks.

Multiple researchers had pointed towards the MiniMax family of models owing to Space Bunny’s exact token-count signatures with MiniMax-01. MiniMax also runs Hailuo AI an artificial intelligence-powered video and image generation platform

The model is available via MiniMax’s API (OpenAI- and Anthropic-compatible), MiniMax Code, and M Plan subscriptions. Early feedback praises its speed and cost-effectiveness for practical coding and agent tasks.

Also Read: Open Source AI Models: US Sees Threat, China says Fair Deal

Author

  • Vaibhav Jha, editor and co-founder at AI FrontPage

    Vaibhav Jha is an Editor and Co-founder of AI FrontPage. In his decade long career in journalism, Vaibhav has reported for publications including The Indian Express, Hindustan Times, and The New York Times, covering the intersection of technology, policy, and society. Outside work, he’s usually trying to persuade people to watch Anurag Kashyap films.

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