Mistral-Large-3-675B-Instruct-2512

<h1 align: center; style="display: flex; align-items: center; gap: 10px; margin: 0;"> Mistral Large 3 675B Instruct 2512 <img src="https://www.redhat.com/rhdc/managed-files/Catalog-Validated_model_0.png" alt="Model Icon" width="40" style="margin: 0; padding: 0;" /> </h1> <a href="https://www.redhat.com/en/products/ai/validated-models" target="_blank" style="margin: 0; padding: 0;"> <img src="https://www.redhat.com/rhdc/managed-files/Validated_badge-Dark.png" alt="Validated Badge" width="250" style="margin: 0; padding: 0;" /> </a>

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 in FP8, 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.

Learn more in our blog post here.

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.

We provide a BF16 version if needed.

• ModelCar Storage URI: oci://registry.redhat.io/rhai/modelcar-mistral-large-3-675b-instruct-2512:3.0
• Validated on RHOAI 3.2: quay.io/modh/vllm:rhoai-3.2-cuda
• Validated on RHAIIS 3.2.5: http://registry.redhat.io/rhaiis/vllm-cuda-rhel9:3.2.5-1766067105
• Validated on vLLM: 0.11.2

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

We compare Mistral Large 3 to similar sized models.

Usage

The model can be used with the following frameworks;

• vllm: See here

[!Note] We sadly didn't have enough time to add Mistral Large 3 to transformers, but we would be very happy for a community contribution by opening a PR to huggingface/transformers.

vLLM

We recommend using this model with vLLM.

Installation

Make sure to install vllm >= 1.12.0:

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

The Mistral Large 3 Instruct FP8 format can be used on one 8xH200 node. We recommend to use this format if you plan to fine-tuning as it can be more precise than NVFP4 in some situations.

Simple

A simple launch command is:

vllm serve mistralai/Mistral-Large-3-675B-Instruct-2512 \
  --max-model-len 262144 --tensor-parallel-size 8 \
  --tokenizer_mode mistral --config_format mistral --load_format mistral \
  --enable-auto-tool-choice --tool-call-parser mistral

Key parameter notes:

• enable-auto-tool-choice: Required when enabling tool usage.
• tool-call-parser mistral: Required when enabling tool usage.

Additional flags:

• You can set --max-model-len to preserve memory. By default it is set to 262144 which is quite large but not necessary for most scenarios.
• You can set --max-num-batched-tokens to balance throughput and latency, higher means higher throughput but higher latency.

Accelerated with speculative decoding

For maximum performance we recommend serving the checkpoint with its customized draft model Mistral-Large-3-675B-Instruct-2512-Eagle:

vllm serve mistralai/Mistral-Large-3-675B-Instruct-2512 \
  --tensor-parallel-size 8 \
  --load-format mistral \
  --tokenizer-mode mistral \
  --config-format mistral \
  --enable-auto-tool-choice \
  --tool-call-parser mistral \
  --limit-mm-per-prompt '{"image": 10}' \
  --speculative_config '{
    "model": "mistralai/Mistral-Large-3-675B-Instruct-2512-Eagle",
    "num_speculative_tokens": 3,
    "method": "eagle",
    "max_model_len": "16384"
  }'

For more information on the draft model, please have a look at Mistral-Large-3-675B-Instruct-2512-Eagle.

<details> <summary>Deploy on <strong>Red Hat AI Inference Server</strong></summary>

podman run --rm -it --device nvidia.com/gpu=all -p 8000:8000 \
 --ipc=host \
--env "HUGGING_FACE_HUB_TOKEN=$HF_TOKEN" \
--env "HF_HUB_OFFLINE=0" -v ~/.cache/vllm:/home/vllm/.cache \
--name=vllm \
registry.access.redhat.com/rhaiis/rh-vllm-cuda \
vllm serve \
--tensor-parallel-size 8 \
--max-model-len 32768  \
--enforce-eager --model RedHatAI/Mistral-Large-3-675B-Instruct-2512

</details> <details> <summary>Deploy on <strong>Red Hat Openshift AI</strong></summary>

# Setting up vllm server with ServingRuntime
# Save as: vllm-servingruntime.yaml
apiVersion: serving.kserve.io/v1alpha1
kind: ServingRuntime
metadata:
 name: vllm-cuda-runtime # OPTIONAL CHANGE: set a unique name
 annotations:
   openshift.io/display-name: vLLM NVIDIA GPU ServingRuntime for KServe
   opendatahub.io/recommended-accelerators: '["nvidia.com/gpu"]'
 labels:
   opendatahub.io/dashboard: 'true'
spec:
 annotations:
   prometheus.io/port: '8080'
   prometheus.io/path: '/metrics'
 multiModel: false
 supportedModelFormats:
   - autoSelect: true
     name: vLLM
 containers:
   - name: kserve-container
     image: quay.io/modh/vllm:rhoai-3.2-cuda # CHANGE if needed. If AMD: quay.io/modh/vllm:rhoai-3.2-rocm
     command:
       - python
       - -m
       - vllm.entrypoints.openai.api_server
     args:
       - "--port=8080"
       - "--model=/mnt/models"
       - "--served-model-name={{.Name}}"
     env:
       - name: HF_HOME
         value: /tmp/hf_home
     ports:
       - containerPort: 8080
         protocol: TCP

# Attach model to vllm server. This is an NVIDIA template
# Save as: inferenceservice.yaml
apiVersion: serving.kserve.io/v1beta1
kind: InferenceService
metadata:
  annotations:
    openshift.io/display-name: Mistral-Large-3-675B-Instruct-2512 # OPTIONAL CHANGE
    serving.kserve.io/deploymentMode: RawDeployment
  name: Mistral-Large-3-675B-Instruct-2512        # specify model name. This value will be used to invoke the model in the payload
  labels:
    opendatahub.io/dashboard: 'true'
spec:
  predictor:
    maxReplicas: 1
    minReplicas: 1
    model:
      modelFormat:
        name: vLLM
      name: ''
      resources:
        limits:
          cpu: '2'			# this is model specific
          memory: 8Gi		# this is model specific
          nvidia.com/gpu: '1'	# this is accelerator specific
        requests:			# same comment for this block
          cpu: '1'
          memory: 4Gi
          nvidia.com/gpu: '1'
      runtime: vllm-cuda-runtime	# must match the ServingRuntime name above
      storageUri: oci://registry.redhat.io/rhai/modelcar-mistral-large-3-675b-instruct-2512:3.0
    tolerations:
    - effect: NoSchedule
      key: nvidia.com/gpu
      operator: Exists

# make sure first to be in the project where you want to deploy the model
# oc project <project-name>

# apply both resources to run model

# Apply the ServingRuntime
oc apply -f vllm-servingruntime.yaml

# Replace <inference-service-name> and <cluster-ingress-domain> below:
# - Run `oc get inferenceservice` to find your URL if unsure.

# Call the server using curl:
curl https://<inference-service-name>-predictor-default.<domain>/v1/chat/completions
        -H "Content-Type: application/json" \
        -d '{
    "model": "Mistral-Large-3-675B-Instruct-2512",
    "stream": true,
    "stream_options": {
        "include_usage": true
    },
    "max_tokens": 1,
    "messages": [
        {
            "role": "user",
            "content": "How can a bee fly when its wings are so small?"
        }
    ]
}'

See Red Hat Openshift AI documentation for more details.

</details>

Usage of the model

Here we asumme that the model mistralai/Mistral-Large-3-675B-Instruct-2512 is served and you can ping it to the domain localhost with the port 8000 which is the default for vLLM.

<details> <summary>Vision Reasoning</summary>

Let's see if Mistral Large 3 knows when to pick a fight !

from datetime import datetime, timedelta

from openai import OpenAI
from huggingface_hub import hf_hub_download

# Modify OpenAI's API key and API base to use vLLM's API server.
openai_api_key = "EMPTY"
openai_api_base = "http://localhost:8000/v1"

TEMP = 0.15
MAX_TOK = 262144

client = OpenAI(
    api_key=openai_api_key,
    base_url=openai_api_base,
)

models = client.models.list()
model = models.data[0].id


def load_system_prompt(repo_id: str, filename: str) -> str:
    file_path = hf_hub_download(repo_id=repo_id, filename=filename)
    with open(file_path, "r") as file:
        system_prompt = file.read()
    today = datetime.today().strftime("%Y-%m-%d")
    yesterday = (datetime.today() - timedelta(days=1)).strftime("%Y-%m-%d")
    model_name = repo_id.split("/")[-1]
    return system_prompt.format(name=model_name, today=today, yesterday=yesterday)


SYSTEM_PROMPT = load_system_prompt(model, "SYSTEM_PROMPT.txt")
image_url = "https://static.wikia.nocookie.net/essentialsdocs/images/7/70/Battle.png/revision/latest?cb=20220523172438"

messages = [
    {"role": "system", "content": SYSTEM_PROMPT},
    {
        "role": "user",
        "content": [
            {
                "type": "text",
                "text": "What action do you think I should take in this situation? List all the possible actions and explain why you think they are good or bad.",
            },
            {"type": "image_url", "image_url": {"url": image_url}},
        ],
    },
]


response = client.chat.completions.create(
    model=model,
    messages=messages,
    temperature=TEMP,
    max_tokens=MAX_TOK,
)

print(response.choices[0].message.content)

</details> <details> <summary>Function Calling</summary>

Let's solve some equations thanks to our simple Python calculator tool.

import json
from openai import OpenAI
from huggingface_hub import hf_hub_download

# Modify OpenAI's API key and API base to use vLLM's API server.
openai_api_key = "EMPTY"
openai_api_base = "http://localhost:8000/v1"

TEMP = 0.15
MAX_TOK = 262144

client = OpenAI(
    api_key=openai_api_key,
    base_url=openai_api_base,
)

models = client.models.list()
model = models.data[0].id


def load_system_prompt(repo_id: str, filename: str) -> str:
    file_path = hf_hub_download(repo_id=repo_id, filename=filename)
    with open(file_path, "r") as file:
        system_prompt = file.read()
    return system_prompt


SYSTEM_PROMPT = load_system_prompt(model, "SYSTEM_PROMPT.txt")

image_url = "https://math-coaching.com/img/fiche/46/expressions-mathematiques.jpg"


def my_calculator(expression: str) -> str:
    return str(eval(expression))


tools = [
    {
        "type": "function",
        "function": {
            "name": "my_calculator",
            "description": "A calculator that can evaluate a mathematical equation and compute its results.",
            "parameters": {
                "type": "object",
                "properties": {
                    "expression": {
                        "type": "string",
                        "description": "The mathematical expression to evaluate.",
                    },
                },
                "required": ["expression"],
            },
        },
    },
    {
        "type": "function",
        "function": {
            "name": "rewrite",
            "description": "Rewrite a given text for improved clarity",
            "parameters": {
                "type": "object",
                "properties": {
                    "text": {
                        "type": "string",
                        "description": "The input text to rewrite",
                    }
                },
            },
        },
    },
]

messages = [
    {"role": "system", "content": SYSTEM_PROMPT},
    {
        "role": "user",
        "content": [
            {
                "type": "text",
                "text": "Thanks to your calculator, compute the results for the equations that involve numbers displayed in the image.",
            },
            {
                "type": "image_url",
                "image_url": {
                    "url": image_url,
                },
            },
        ],
    },
]

response = client.chat.completions.create(
    model=model,
    messages=messages,
    temperature=TEMP,
    max_tokens=MAX_TOK,
    tools=tools,
    tool_choice="auto",
)

tool_calls = response.choices[0].message.tool_calls

results = []
for tool_call in tool_calls:
    function_name = tool_call.function.name
    function_args = tool_call.function.arguments
    if function_name == "my_calculator":
        result = my_calculator(**json.loads(function_args))
        results.append(result)

messages.append({"role": "assistant", "tool_calls": tool_calls})
for tool_call, result in zip(tool_calls, results):
    messages.append(
        {
            "role": "tool",
            "tool_call_id": tool_call.id,
            "name": tool_call.function.name,
            "content": result,
        }
    )


response = client.chat.completions.create(
    model=model,
    messages=messages,
    temperature=TEMP,
    max_tokens=MAX_TOK,
)

print(response.choices[0].message.content)

</details> <details> <summary>Text-Only Request</summary>

Mistral Large 3 can follow your instructions down to the letter.

from openai import OpenAI
from huggingface_hub import hf_hub_download

# Modify OpenAI's API key and API base to use vLLM's API server.
openai_api_key = "EMPTY"
openai_api_base = "http://localhost:8000/v1"

TEMP = 0.15
MAX_TOK = 262144

client = OpenAI(
    api_key=openai_api_key,
    base_url=openai_api_base,
)

models = client.models.list()
model = models.data[0].id


def load_system_prompt(repo_id: str, filename: str) -> str:
    file_path = hf_hub_download(repo_id=repo_id, filename=filename)
    with open(file_path, "r") as file:
        system_prompt = file.read()
    return system_prompt


SYSTEM_PROMPT = load_system_prompt(model, "SYSTEM_PROMPT.txt")

messages = [
    {"role": "system", "content": SYSTEM_PROMPT},
    {
        "role": "user",
        "content": "Write me a sentence where every word starts with the next letter in the alphabet - start with 'a' and end with 'z'.",
    },
]

response = client.chat.completions.create(
    model=model,
    messages=messages,
    temperature=TEMP,
    max_tokens=MAX_TOK,
)

assistant_message = response.choices[0].message.content
print(assistant_message)

</details>

Red Hat AI Evaluations

As part of the model validation effort, Red Hat conducted independent accuracy evaluations and the results are presented below. The model was evaluated with vLLM version 0.12.0 and either lm-evaluation-harness or lighteval depending on the benchmark.

<details> <summary>Evaluation commands</summary>

All evaluations were conducted using the vLLM server interface. The server is first initialized with the following command on 8 H200 GPUs:

vllm serve RedHatAI/Mistral-Large-3-675B-Instruct-2512 \
  --max-model-len 64000 \
  --tensor-parallel-size 8 \
  --tokenizer_mode mistral \
  --config_format mistral \
  --load_format mistral \
  --limit-mm-per-prompt '{"image": 10}'

MMLU-Pro, IFEval and MMMU were evaluated using lm-evaluation-harness as follows.

lm_eval \
  --model local-chat-completions \
  --tasks mmlu_pro,ifeval,mmmu_val \
  --model_args "model=RedHatAI/Mistral-Large-3-675B-Instruct-2512,max_length=64000,base_url=http://0.0.0.0:8000/v1/chat/completions,num_concurrent=64,max_retries=3,tokenized_requests=False,tokenizer_backend=None,timeout=1200,max_images=10" \
  --apply_chat_template \
  --fewshot_as_multiturn \
  --output_path results_lmeval_mistral_large_3 \
  --gen_kwargs "do_sample=True,temperature=0.15,max_gen_toks=42000"

AIME25, GPQA Diamond and Math 500 were evaluated using lighteval as follows.

litellm_config.yaml

model_parameters:
  provider: "hosted_vllm"
  model_name: "hosted_vllm/RedHatAI/Mistral-Large-3-675B-Instruct-2512"
  base_url: "http://0.0.0.0:8000/v1"
  api_key: ""
  timeout: 1200
  concurrent_requests: 64
  generation_parameters:
    temperature: 0.15
    max_new_tokens: 42000

lighteval endpoint litellm litellm_config.yaml \
"aime25|0,math_500|0,gpqa:diamond|0" \
--output-dir results_lighteval_mistral_large_3 \
--save-details

</details> <table> <thead> <tr> <th>Benchmark</th> <th>RedHatAI/Mistral-Small-3.2-24B-Instruct-2506</th> <th>RedHatAI/Mistral-Small-3.2-24B-Instruct-2506-NVFP4</th> <th>Recovery</th> </tr> </thead> <tbody> <tr> <td>MMLU-Pro</td> <td>50.60</td> <td>54.54</td> <td>107.8%</td> </tr> <tr> <td>IFEval</td> <td>85.37</td> <td>83.77</td> <td>98.1%</td> </tr> <tr> <td>MMMU</td> <td>59.33</td> <td>56.65</td> <td>95.5%</td> </tr> <tr> <td>AIME25</td> <td>43.75</td> <td>33.33</td> <td>76.2%</td> </tr> <tr> <td>GPQA Diamond</td> <td>69.02</td> <td>70.54</td> <td>102.2%</td> </tr> <tr> <td>MATH 500</td> <td>84.87</td> <td>77.47</td> <td>91.3%</td> </tr> </tbody> </table>

License

This model is licensed under the Apache 2.0 License.

You must not use this model in a manner that infringes, misappropriates, or otherwise violates any third party’s rights, including intellectual property rights.