Kimi K2.5 NVFP4

Model Overview

Description:

The NVIDIA Kimi-K2.5-NVFP4 model is the quantized version of the Moonshot AI's Kimi-K2.5 model, which is an auto-regressive language model that uses an optimized transformer architecture. For more information, please check here. The NVIDIA Kimi-K2.5 NVFP4 model is quantized with Model Optimizer.

This model is ready for commercial/non-commercial use.

Third-Party Community Consideration

This model is not owned or developed by NVIDIA. This model has been developed and built to a third-party’s requirements for this application and use case; see link to Non-NVIDIA (Kimi-K2.5) Model Card.

License/Terms of Use:

Governing Terms: Use of this model is governed by the NVIDIA Open Model License.

ADDITIONAL INFORMATION: Modified MIT License.

Deployment Geography

Global

Use Case

This model is intended for developers and researchers building LLMs

Release Date

Hugging Face 02/02/2026 via https://huggingface.co/nvidia/Kimi-K2.5-NVFP4

Model Architecture:

Architecture Type: Transformers
Network Architecture: DeepSeek V3
Number of Model Parameters: 1T

Input:

Input Type(s): Text, Image, Video
Input Format(s): String, Undisclosed, Undisclosed
Input Parameters: One-Dimensional (1D), Two-Dimensional (2D), Three-Dimensional (3D)
Other Properties Related to Input: Context length: 256k

Output:

Output Type(s): Text
Output Format: String
Output Parameters: 1D (One Dimensional): Sequences

Our AI models are designed and/or optimized to run on NVIDIA GPU-accelerated systems. By leveraging NVIDIA’s hardware (e.g. GPU cores) and software frameworks (e.g., CUDA libraries), the model achieves faster training and inference times compared to CPU-only solutions.

Software Integration:

Supported Runtime Engine(s):

• vLLM
  

Supported Hardware Microarchitecture Compatibility:

• NVIDIA Blackwell
  

Preferred Operating System(s):

• Linux
  The integration of foundation and fine-tuned models into AI systems requires additional testing using use-case-specific data to ensure safe and effective deployment. Following the V-model methodology, iterative testing and validation at both unit and system levels are essential to mitigate risks, meet technical and functional requirements, and ensure compliance with safety and ethical standards before deployment.

Model Version(s):

** The model is quantized with nvidia-modelopt v0.41.0

Calibration Datasets:

• Calibration Dataset: cnn_dailymail
  ** Data collection method: Automated.
  ** Labeling method: Automated.
  ** Properties: CNN / DailyMail Dataset is an English-language dataset containing over 300k unique news articles as written by journalists at CNN and the Daily Mail.
  

Training Dataset:

** Data Collection Method by dataset: Hybrid: Human, Automated
** Labeling Method by dataset: Hybrid: Human, Automated
** Data Modality: Text, Image, Video
** Training Data Size: undisclosed.

Testing Dataset:

** Data Collection Method by dataset: Hybrid: Human, Automated
** Labeling Method by dataset: Hybrid: Human, Automated
** Properties: Undisclosed

Evaluation Dataset:

** Data Collection Method by dataset: Hybrid: Human, Automated
** Labeling Method by dataset: Hybrid: Human, Automated
** Properties: Undisclosed

Inference:

Engine: vLLM
Test Hardware: B200

Post Training Quantization

This model was obtained by converting and quantizing the weights and activations of Kimi-K2.5 from INT4 to BF16 to NVFP4 data type, ready for inference with vLLM. Only the weights and activations of the linear operators within transformer blocks in MoE are quantized.

Usage

To serve this checkpoint with vLLM, you can start the docker vllm/vllm-openai:latest and run the sample command below:

python3 -m vllm.entrypoints.openai.api_server --model nvidia/Kimi-K2.5-NVFP4 --tensor-parallel-size 4 --tool-call-parser kimi_k2 --reasoning-parser kimi_k2 --trust-remote-code

Evaluation

The accuracy benchmark results are presented in the table below:

Baseline (official) numbers are from the Kimi-K2.5 model card. Evaluation settings follow the same configuration as described in the Kimi-K2.5 model card

Model Limitations:

The base model was trained on data that contains toxic language and societal biases originally crawled from the internet. Therefore, the model may amplify those biases and return toxic responses especially when prompted with toxic prompts. The model may generate answers that may be inaccurate, omit key information, or include irrelevant or redundant text producing socially unacceptable or undesirable text, even if the prompt itself does not include anything explicitly offensive.

Ethical Considerations

NVIDIA believes Trustworthy AI is a shared responsibility and we have established policies and practices to enable development for a wide array of AI applications. When downloaded or used in accordance with our terms of service, developers should work with their internal model team to ensure this model meets requirements for the relevant industry and use case and addresses unforeseen product misuse.

Please report model quality, risk, security vulnerabilities or NVIDIA AI Concerns here.