MiniMax M3.1 Flash is live on Featherless

MiniMax has released open weights for MiniMax M3.1 Flash, a 428B-parameter mixture-of-experts model with 23B active parameters per token designed for coding, agentic workflows, computer use, and security tasks. Previously tested anonymously as “Space Bunny,” the model reportedly served more than 200 trillion tokens before launch and introduces full-model sparse attention, training-time 8-bit quantization, and a DSpark draft head for speculative decoding, which MiniMax says reduce serving costs to roughly one-third of M3’s and increase speed threefold. Artificial Analysis rates it 43 on its Intelligence Index at an estimated $0.22 per task, with a 48% score on Humanity’s Last Exam, while MiniMax reports strong results across automation, software engineering, desktop operation, cybersecurity, and visual reasoning benchmarks. Featherless hosts the model with FP4 quantization, vision support, and a 256K-token context window through an OpenAI-compatible API, while MiniMax’s native context capacity reaches 1 million tokens; Featherless also promotes dedicated GPU deployments for higher-volume use.

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