TestedActually.
Comparisons with published methodology Every claim dated & sourced

News · 2026-10-25

MiniMax publishes M3.1 Flash weights: 428B-parameter multimodal MoE for coding and agents, 1M-token context

MiniMax published open weights for M3.1 Flash on 23 October 2026, four days after the model's hosted launch on 19 October. The Hugging Face model card confirms a native multimodal mixture-of-experts model: approximately 428 billion total parameters with 23 billion activated per token, a 1,000,000-token context window, text, image and video inputs, sparse attention throughout, and a DSpark speculative-decoding draft head, under the MiniMax Community licence (not a permissive Apache-style licence). MiniMax reports 73.7% on DeepSWE v1.1, 61.7 on OSWorld V2, 76.2 on BankerToolBench and 82.2 on CyberGym, all vendor-run, and says the hosted model costs 70% less than its predecessor with 200+ output tokens per second. Weights are live on Hugging Face and ModelScope, community GGUF conversions appeared the same day, and MiniMax published deployment guidance for SGLang and vLLM.

What it means for buyers

At 428B total parameters this is a multi-GPU server or high-memory workstation model, not a laptop download, so Ollama and LM Studio users should size hardware before benchmarking — the release matters most for self-hosting teams on SGLang or vLLM who now have a low-cost agentic and coding model outside the US labs, and for buyers weighing self-hosted inference against MiniMax's hosted API. The benchmarks above are vendor-reported; validate on your own tasks before switching. It lands in the same open-weight wave as Kimi K3.1 Pro, which targets the same coding-and-agents workload at a smaller footprint.

Where to check it

Sources

  1. MiniMax-M3.1-Flash model card (Hugging Face) — weights release, parameters, context window, licence, benchmarks, checked 2026-10-25
  2. MiniMax M3.1 Flash: Redefining Agent Performance and Cost (MiniMax blog) — hosted launch 19 October, cost claim, availability, checked 2026-10-25
  3. MiniMax releases open weights for M3.1 Flash (iMasters) — independent report dating the weight drop 23 October, SGLang and vLLM guidance, checked 2026-10-25