The FAQ on their website says Minimax 3.1 flash is 428B total, 23B active

Which is roughly similar to deepseek 4.1 flash.

I find it interesting that we’re calling these “flash” models now, even though they aren’t “small or light” and in many cases aren’t particularly that fast.

I suppose it’s more so that the standard for “regular models” is becoming 1T+

https://agent.minimax.io/tools/m3-1-flash-preview

Flash probably means single expert fits into some cost efficient GPU memory, and non flash models require more complex and cost expensive architectures.