Minimax Launches M3.1 Flash, a Multimodal Coding Model with 1M Token Context

Minimax officially revealed M3.1 Flash on October 19, ending weeks of speculation about a mysterious model called Space Bunny that had been operating anonymously on OpenRouter since late September. The Chinese AI company introduced the closed-source model as a frontier multimodal coding system designed for agentic reasoning, tool use, and long-context development work, with a one-million-token context window and tunable reasoning depth across five effort levels.