M3.1 Flash weights are now open

Native multimodal model for coding, agentic workflows, and computer use

MiniMax M3.1 Flash is a native multimodal Mixture-of-Experts model from MiniMax for coding, agentic workflows, computer use, and cybersecurity. With roughly 428B total parameters and 23B active per token, it accepts text, image, and video input across a context window of up to 1M tokens. Building on MiniMax M3, it improves both task performance and inference efficiency: MiniMax Sparse Attention now runs throughout the model, quantization-aware training covers the routed experts and attention paths to reduce memory footprint, and a DSpark speculative decoding head ships with the release. The model carries complex, multi-step professional workflows through to completion, understands real codebases, fixes bugs, and builds features, and reasons over images and charts to produce polished frontends and presentations. Released under the MiniMax Community License. Available on Together AI.

Native multimodal MoE built for agentic and engineering work

Long agent sessions, large codebases, and long documents in one request

Reasons over screens, charts, and video alongside text

curl -X POST "https://api.together.xyz/v1/chat/completions"
-H "Authorization: Bearer $TOGETHER_API_KEY"
-H "Content-Type: application/json"
-d '{ "model": "MiniMaxAI/MiniMax-M3.1-Flash", "messages": [ { "role": "user", "content": "What are some fun things to do in New York?" } ] }'

from together import Together

client = Together()

response = client.chat.completions.create( model="MiniMaxAI/MiniMax-M3.1-Flash", messages=[ { "role": "user", "content": "What are some fun things to do in New York?" } ] ) print(response.choices[0].message.content)

import Together from 'together-ai'; const together = new Together();

const completion = await together.chat.completions.create({ model: 'MiniMaxAI/MiniMax-M3.1-Flash', messages: [ { role: 'user', content: 'What are some fun things to do in New York?' } ], });

console.log(completion.choices[0].message.content);

Model card

Architecture Overview: • Native multimodal Mixture-of-Experts with approximately 428B total parameters and 23B activated per token, retaining MiniMax M3's core MoE architecture • MiniMax Sparse Attention (MSA) throughout the model, with the three full-attention layers from M3 replaced by sparse attention • DSpark speculative decoding draft head included, replacing M3's earlier multi-token prediction approach • Text, image, and video input with text output, across a context window of up to 1M tokens

Training Methodology: • Builds on MiniMax M3, improving task performance and inference efficiency • Quantization-aware training applied to the routed MoE experts and attention paths, reducing memory footprint and improving serving efficiency

Performance Characteristics: • Workflow automation (AutomationBench v1.0.6: 62.8, the highest among the open models in MiniMax's comparison; BankerToolBench financial tool use: 76.2; GDP.pdf AA: 20.8) • Agentic tasks (Agents' Last Exam: 29.6; LOCA-Bench at 256K context: 60.3; PostTrain Bench v1.1: 39.3) • Computer use (OSWorld 2.0: 61.7) • Software engineering (DeepSWE v1.1: 73.7; NL2Repo-Bench repository generation: 61.2; Terminal Bench 4.0: 38.1; SWE Refactor Bench: 23.0) • Security research (CyberGym vulnerability discovery: 82.2) • Visual reasoning (BabyVision with tools: 91.0; CharXiv RQ scientific chart reasoning: 82.5) • Knowledge and reasoning (Humanity's Last Exam without tools: 43.4; MiniMax-reported AA-Omniscience: 56% and CritPt research-level physics: 22.3%)

Together AI API Access: • Access MiniMax M3.1 Flash via Together AI APIs using the endpoint MiniMaxAI/MiniMax-M3.1-Flash • Authenticate using your Together AI API key in request headers • Set reasoning_effort to low, medium, high, xhigh, or max to control deliberation depth • Recommended sampling: temperature 1.0 and top-p 0.95 • Supports text, image, and video input across a context window of up to 1M tokens • Available on Together AI serverless and dedicated infrastructure

Cowork & Workflow Automation: • Automate complex, multi-step professional workflows end to end • Run financial analysis tasks for banking and finance teams through tool use • Sustain long agent sessions with up to 1M tokens of context

Software Engineering: • Navigate real codebases to fix bugs, refactor, and build features • Generate full repositories from natural language specifications • Produce polished frontends from requirements or visual references

Computer Use & Security: • Automate desktop and application workflows grounded in screen understanding • Run authorized vulnerability discovery across codebases • Analyze charts, documents, and video inside agent pipelines

View All

Chat

Qwen3.8-2.4T-A95B

Cached/1M

Serverless

Dedicated

Endpoint

MiniMaxAI/MiniMax-M3.1-Flash

Parameters

428B

Activated parameters

23B

Context length

1M

Input price

$0.15 / 1M tokens