mistralai/Mistral-Large-3-675B-Instruct-2512-NVFP4

Mistral Large 3 675B Instruct 2512 NVFP4

From our family of large models, Mistral Large 3 is a state-of-the-art general-purpose Multimodal granular Mixture-of-Experts model with 41B active parameters and 675B total parameters trained from the ground up with 3000 H200s.

This model is the instruct post-trained version, fine-tuned for instruction tasks, making it ideal for chat, agentic and instruction based use cases. Designed for reliability and long-context comprehension - It is engineered for production-grade assistants, retrieval-augmented systems, scientific workloads, and complex enterprise workflows.

> [!Tip] > This checkpoint in particular is a post-training-activation quantized version of Mistral-Large-3-675B-Instruct-2512. > It was created using llm-compressor as part of a collaboration with teams from vLLM & Red Hat. > Special thanks goes out to Dipika Sikka, Kyle Sayers, Eldar Kurtić, and Tyler Michael Smith.

Mistral Large 3 is deployable on-premises in:

• FP8 on a single node of B200s or H200s.
• NVFP4 on a single node of H100s or A100s.

Key Features

Mistral Large 3 consists of two main architectural components:

• A Granular MoE Language Model with 673B params and 39B active
• A 2.5B Vision Encoder

The Mistral Large 3 Instruct model offers the following capabilities:

• Vision: Enables the model to analyze images and provide insights based on visual content, in addition to text.
• Multilingual: Supports dozens of languages, including English, French, Spanish, German, Italian, Portuguese, Dutch, Chinese, Japanese, Korean, Arabic.
• System Prompt: Maintains strong adherence and support for system prompts.
• Agentic: Offers best-in-class agentic capabilities with native function calling and JSON outputting.
• Frontier: Delivers best-in-class performance.
• Apache 2.0 License: Open-source license allowing usage and modification for both commercial and non-commercial purposes.
• Large Context Window: Supports a 256k context window.

Use Cases

With powerful long-context performance, stable and consistent cross-domain behavior, Mistral Large 3 is perfect for:

• Long Document Understanding
• Powerful Daily-Driver AI Assistants
• State-of-the-Art Agentic and Tool-Use Capabilities
• Enterprise Knowledge Work
• General Coding Assistant

And enterprise-grade use cases requiring frontier capabilities.

Recommended Settings

We recommend deploying Large 3 in a client-server configuration with the following best practices:

• System Prompt: Define a clear environment and use case, including guidance on how to effectively leverage tools in agentic systems.
• Sampling Parameters: Use a temperature below 0.1 for daily-driver and production environments ; Higher temperatures may be explored for creative use cases - developers are encouraged to experiment with alternative settings.
• Tools: Keep the set of tools well-defined and limit their number to the minimum required for the use case - Avoiding overloading the model with an excessive number of tools.
• Vision: When deploying with vision capabilities, we recommend maintaining an aspect ratio close to 1:1 (width-to-height) for images. Avoiding the use of overly thin or wide images - crop them as needed to ensure optimal performance.

Known Issues / Limitations

• Not a dedicated reasoning model: Dedicated reasoning models can outperform Mistral Large 3 in strict reasoning use cases.
• Behind vision-first models in multimodal tasks: Mistral Large 3 can lag behind models optimized for vision tasks and use cases.
• Complex deployment: Due to its large size and architecture, the model can be challenging to deploy efficiently with constrained resources or at scale.

Benchmark Results

> [!Warning] > For tasks requiring context lengths less than 32k tokens, you should see no performance degradation as compared to Mistral-Large-3-675B-Instruct-2512, > for tasks requiring more context you might experience a small degradation in performance.

We compare Mistral Large 3 to similar sized models.

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Usage

The model can be used with the following frameworks;

• `vllm`: See [here](#vllm)

vLLM

We recommend using this model with vLLM.

Installation

Make sure to install vllm >= 0.12.0:

pip install vllm --upgrade

Doing so should automatically install `mistral_common >= 1.8.6`.

To check:

python -c "import mistral_common; print(mistral_common.__version__)"

You can also make use of a ready-to-go docker image or on the docker hub.

Serve

We recommend to use this format if you plan to deploy Mistral Large 3 has it achieves performance similar to FP8 for less memory. However please note that for large context (> 64k) we observed a subsequent drop of performance. In such cases, please use the FP8 weights. Otherwise on B200 (Blackwell 200) we observe a significant speed-up and a minor regression on vision datasets probably due to the calibration that was performed mainly on text data.

To take full advantage of the NVFP4 format, consider using B200 GPUs that has a dedicated architecture to maximize its performance. For those who do not have access to this GPU generation, vLLM has the awesome feature to fall back to Marlin FP4 which allows you to still run the quantized model in older generations (A100, H100). You won't notice a speed-up in comparison with FP8 quantization but still benefit a memory gain.

A simple launch command is:

vllm serve mistralai/Mistral-Large-3-675B-Instruct-2512-NVFP4 \
--max-model-len 262144…