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MiniMax Opens M3.1-Flash-Preview Text Model for Public Beta

MiniMax Debuts M3.1-Flash-Preview Text Model in Public Beta

The race to build smarter AI models shows no signs of slowing down. On September 28, Chinese AI company MiniMax officially launched its latest text model, M3.1-Flash-Preview, opening it up for full public testing.

So what makes this model stand out? Two things, mainly. First, it comes with native multimodal capabilities—meaning it can handle different types of data, not just text. Second, it supports an ultra-long context window of up to a million characters. That's a lot of room to work with.

In practical terms, the model doesn't just fix code bugs; it can also build complex functions from scratch. It walks through the entire development loop: spotting the problem, writing the code, and running tests to make sure everything works. For developers, that's a serious productivity boost.

The 'Space Bunny' Connection

Before M3.1-Flash-Preview had a name, sharp-eyed developers noticed something fishy. A mysterious anonymous model called 'Space Bunny' (or 'Space Rabbit' in Chinese) appeared on September 23. During the Mid-Autumn Festival holiday, this mystery model shot to the top of daily usage charts on OpenRouter, a model aggregation platform, and OpenCode, a programming platform. Tech enthusiasts couldn't stop talking about it.

Now that M3.1-Flash-Preview is out, the pieces fit together. The underlying tech behind 'Space Bunny' has been fully validated—and it's the same engine powering MiniMax's new release.

What This Means for Developers

For anyone building software, this model promises to be more than just a code assistant. It's designed to be a reliable partner throughout the development process. Whether you're debugging a tricky issue or starting a new project, the model aims to provide consistent, high-quality support.

The public beta is open now, so developers can test it firsthand and see how it performs in real-world scenarios.

Key Points

  • MiniMax has launched M3.1-Flash-Preview for public beta testing as of September 28.
  • The model features native multimodal support and a million-character context window.
  • It handles code bug fixes, full function development, and test verification.
  • Developers previously linked it to the anonymous 'Space Bunny' model that topped OpenRouter and OpenCode during the Mid-Autumn Festival.
  • The official unveiling confirms the model's technical strength and real-world potential.