Model Overview

Description:

Gemma 4 26B IT is an open multimodal model built by Google DeepMind that handles text and image inputs, can process video as sequences of frames, and generates text output. It is designed to deliver frontier-level performance for reasoning, agentic workflows, coding, and multimodal understanding on consumer GPUs and workstations, with a 256K-token context window and support for over 140 languages. The model uses a hybrid attention mechanism that interleaves local sliding-window and full global attention, with unified Keys and Values in global layers and Proportional RoPE (p-RoPE) to support long-context performance. The NVIDIA Gemma 4 26B IT NVFP4 model is quantized with NVIDIA 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 Gemma 4 26B IT Model Card

License and Terms of Use:

Apache License 2.0 | Gemma | Google AI for Developers

Deployment Geography:

Global

Use Case:

Use Case: Designed for text generation, chatbots and conversational AI, text summarization, image data extraction, reasoning, coding, multimodal understanding, function calling, and research or educational use.

Release Date:

Hugging Face [04/30/2026] via https://huggingface.co/nvidia/Gemma-4-26B-A4B-NVFP4

Model Architecture:

Property	26B A4B MoE
Architecture Type:	Transformers
Total Parameters	25.2B
Active Parameters	3.8B
Layers	30
Sliding Window	1024 tokens
Context Length	256K tokens
Vocabulary Size	262K
Expert Count	8 active / 128 total and 1 shared
Supported Modalities	Text, Image
Vision Encoder Parameters	~550M

The "A" in 26B A4B stands for "active parameters" in contrast to the total number of parameters the model contains.

Input:

Input Type(s): Processes Text, Image with variable aspect ratio and resolution support (all models), Video, and Audio (featured natively on the E2B and E4B models).
Input Format(s): String, Red, Green, Blue (RGB), Video (MP4/WebM)
Input Parameters: One-Dimensional (1D), Two-Dimensional (2D), Three-Dimensional (3D)
Other Properties Related to Input: Supports variable image aspect ratios and resolutions, configurable visual token budgets of 70, 140, 280, 560, and 1120, and video inputs up to 60 seconds at one frame per second.
Input Context Length (ISL): 256K

Output:

Output Type(s): Text
Output Format: String
Output Parameters: 1D (One Dimensional): Sequences
Other Properties Related to Output: Generates text responses for chat, reasoning, coding, multimodal understanding, and function-calling workflows. When thinking is enabled, model outputs reasoning tokens as well.

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
  

Model Version(s):

The model version is v1.0 which NVFP4 quantized with nvidia-modelopt v0.43.0

Training, Testing, and Evaluation Datasets:

We calibrated the model using the dataset noted below, and performed evaluation using the benchmarks noted under Evaluation Datasets. We did not perform training or testing for this Model Optimizer release. The methods noted under Training and Testing Datasets below represent the data collection and labeling methods used by the third-party to train and test the underlying Gemma 4 26B IT model.

Calibration Dataset:

Link: cnn_dailymail, Nemotron-Post-Training-Dataset-v2
Data Collection Method by dataset: Automated.
Labeling Method by dataset: Automated.
Properties: The cnn_dailymail dataset contains English-language news articles and summaries. Nemotron-Post-Training-Dataset-v2 is a post-training dataset curated by NVIDIA containing multi-turn conversations across diverse topics.

Training Dataset Data Modality: Text, Image, Audio, Other (Code)
Training Data Collection: Automated
Training Labeling: Undisclosed
Training Properties: Large-scale multimodal pre-training data spanning web documents, code, images, and audio, with a cutoff date of January 2025 and coverage in over 140 languages. Data was filtered for CSAM, sensitive data, quality, and safety.

Testing Dataset Testing Data Collection: Undisclosed
Testing Labeling: Undisclosed
Testing Properties: Undisclosed

Evaluation Dataset:

Data Collection Method by dataset: Hybrid: Human, Automated
Labeling Method by dataset: Hybrid: Human, Automated
Properties: We evaluated the model on text-based reasoning and coding benchmarks: MMLU Pro is a multi-task language understanding benchmark with challenging multiple-choice questions across diverse academic domains; LiveCodeBench V6 contains competitive programming problems; SciCode evaluates scientific coding capabilities; IFEval is a benchmark that tests whether language models can follow explicit, verifiable formatting and structural constraints layered on top of content generation prompts; GPQA Diamond contains 448 graduate-level multiple-choice questions written by domain experts in biology, physics, and chemistry; AIME 2025 contains problems from the American Invitational Mathematics Examination; IFBench is a benchmark for evaluating instruction-following capabilities across diverse and structured task constraints.

Inference:

Engine: vLLM
Test Hardware: B200

Post Training Quantization

This model was obtained by quantizing the weights and activations of Gemma-4-26B-IT-NVFP4 to NVFP4 data type (using the nvfp4_experts_only recipe), ready for inference with vLLM.

Usage

Currently for this model, vllm works with TP=1 only, it does support EP,there is an open issue in vLLM and Flashinfer. Additionally, the current MoE backend is either VLLM_CUTLASS or Marlin, to use the Flashinfer-TRTLLM there is an open PR in vLLM.

To serve this checkpoint with vLLM and run the sample command below.

vllm serve nvidia/Gemma-4-26B-A4B-NVFP4 \
  --tool-call-parser gemma4 \
  --reasoning-parser gemma4 \
  --enable-auto-tool-choice \
  --trust-remote-code

Evaluation Results:

Benchmark	Baseline (Full Precision)	NVFP4
GPQA Diamond	80.30%	79.90%
AIME 2025	88.95%	90.00%
MMLU Pro	85.00%	84.80%
LiveCodeBench (pass@1)	80.50%	79.80%
IFBench	77.77%	78.1%
IFEval	96.60%	96.40%

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 make sure you have proper rights and permissions for all input image and video content; if image or video includes people, personal health information, or intellectual property, the image or video generated will not blur or maintain proportions of image subjects included.

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