❯ MiniMax opens public beta for M3.1-Flash-Preview with multimodal input and a one-million-token context window

The anonymous model steps forwardMiniMax announced that its text model M3.1-Flash-Preview is live and entered public beta on September 28. A third-party guide says it went live in MiniMax Code on September 27, accepts text, image and video input, has a one-million-token context window, keeps thinking always on with five effort levels, and targets everyday development such as bug fixes and feature building.

Testing under a codenameFrom September 23 the model had been on OpenRouter as the anonymous “Space Bunny,” free to use, and developers judged from tokenizer and other tests that it closely resembled MiniMax’s models. It reportedly topped daily usage on OpenRouter and OpenCode during the Mid-Autumn holiday, and MiniMax has now claimed it.

Not everything is published yetMiniMax has not released a model card, benchmark results, per-token pricing or weights. It is available through MiniMax Code and the Token Plan subscription, free on OpenRouter, with a one-week trial on OpenCode. Trial cost is low for developers, but production use should wait for official documentation and independent evaluation; the stable option remains MiniMax-M3.

▪ SIGNALEarning a reputation on developer platforms under a codename, then taking off the mask, has become a way for model companies to win first users.