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Author: Glenn Jocher, Jing Qiu

Maintainer: Ultralytics

Requires Python: >=3.8

Classifiers

Development Status

5 - Production/Stable

Intended Audience

Developers
Education
Science/Research

License

OSI Approved :: GNU Affero General Public License v3 or later (AGPLv3+)

Programming Language

Python :: 3
Python :: 3.8
Python :: 3.9
Python :: 3.10
Python :: 3.11
Python :: 3.12
Python :: 3.13

Topic

Software Development
Scientific/Engineering
Scientific/Engineering :: Artificial Intelligence
Scientific/Engineering :: Image Recognition

Operating System

POSIX :: Linux
MacOS
Microsoft :: Windows

Ultralytics creates cutting-edge, state-of-the-art (SOTA) YOLO models built on years of foundational research in computer vision and AI. Constantly updated for performance and flexibility, our models are fast, accurate, and easy to use. They excel at object detection, tracking, instance segmentation, semantic segmentation, image classification, and pose estimation tasks.

Find detailed documentation in the Ultralytics Docs. Get support via GitHub Issues. Join discussions on Discord, Reddit, and the Ultralytics Community Forums!

Request an Enterprise License for commercial use at Ultralytics Licensing.

📄 Documentation

See below for quickstart installation and usage examples. For comprehensive guidance on training, validation, prediction, and deployment, refer to our full Ultralytics Docs.

Install

Install the ultralytics package, including all requirements, in a Python>=3.8 environment with PyTorch>=1.8.

pip install ultralytics

For alternative installation methods, including Conda, Docker, and building from source via Git, please consult the Quickstart Guide.

Usage

CLI

You can use Ultralytics YOLO directly from the Command Line Interface (CLI) with the yolo command:

# Predict using a pretrained YOLO model (e.g., YOLO26n) on an image
yolo predict model=yolo26n.pt source='https://ultralytics.com/images/bus.jpg'

The yolo command supports various tasks and modes, accepting additional arguments like imgsz=640. Explore the YOLO CLI Docs for more examples.

Python

Ultralytics YOLO can also be integrated directly into your Python projects. It accepts the same configuration arguments as the CLI:

from ultralytics import YOLO

# Load a pretrained YOLO26n model
model = YOLO("yolo26n.pt")

# Train the model on the COCO8 dataset for 100 epochs
train_results = model.train(
    data="coco8.yaml",  # Path to dataset configuration file
    epochs=100,  # Number of training epochs
    imgsz=640,  # Image size for training
    device="cpu",  # Device to run on (e.g., 'cpu', 0, [0,1,2,3])
)

# Evaluate the model's performance on the validation set
metrics = model.val()

# Perform object detection on an image
results = model("path/to/image.jpg")  # Predict on an image
results[0].show()  # Display results

# Export the model to ONNX format for deployment
path = model.export(format="onnx")  # Returns the path to the exported model

Discover more examples in the YOLO Python Docs.

✨ Models

Ultralytics supports a wide range of YOLO models, from early versions like YOLOv3 to the latest YOLO26. The tables below showcase YOLO26 models pretrained on COCO for Detection, Segmentation, and Pose Estimation. Semantic Segmentation models are pretrained on Cityscapes, Depth Estimation models are pretrained on a broad multi-dataset mix and evaluated on NYU Depth V2, and Classification models are pretrained on ImageNet. Tracking mode is compatible with Detection, Segmentation, and Pose models. All Models download automatically from the latest Ultralytics release on first use.

Detection (COCO)

Explore the Detection Docs for usage examples. These models are trained on the COCO dataset, featuring 80 object classes.

Model	size ^(pixels)	mAP^val 50-95	mAP^{val 50-95(e2e)}	Speed ^{CPU ONNX (ms)}	Speed ^{T4 TensorRT10 (ms)}	params ^(M)	FLOPs ^(B)
YOLO26n	640	40.9	40.1	38.9 ± 0.7	1.7 ± 0.0	2.4	5.4
YOLO26s	640	48.6	47.8	87.2 ± 0.9	2.5 ± 0.0	9.5	20.7
YOLO26m	640	53.1	52.5	220.0 ± 1.4	4.7 ± 0.1	20.4	68.2
YOLO26l	640	55.0	54.4	286.2 ± 2.0	6.2 ± 0.2	24.8	86.4
YOLO26x	640	57.5	56.9	525.8 ± 4.0	11.8 ± 0.2	55.7	193.9

mAP^val values refer to single-model single-scale performance on the COCO val2017 dataset. See YOLO Performance Metrics for details.
Reproduce with yolo val detect data=coco.yaml device=0
Speed metrics are averaged over COCO val images using an Amazon EC2 P4d instance. CPU speeds measured with ONNX export. GPU speeds measured with TensorRT export.
Reproduce with yolo val detect data=coco.yaml batch=1 device=0|cpu

Segmentation (COCO)

Refer to the Segmentation Docs for usage examples. These models are trained on COCO-Seg, including 80 classes.

Model	size ^(pixels)	mAP^{box 50-95(e2e)}	mAP^{mask 50-95(e2e)}	Speed ^{CPU ONNX (ms)}	Speed ^{T4 TensorRT10 (ms)}	params ^(M)	FLOPs ^(B)
YOLO26n-seg	640	39.6	33.9	53.3 ± 0.5	2.1 ± 0.0	2.7	9.1
YOLO26s-seg	640	47.3	40.0	118.4 ± 0.9	3.3 ± 0.0	10.4	34.2
YOLO26m-seg	640	52.5	44.1	328.2 ± 2.4	6.7 ± 0.1	23.6	121.5
YOLO26l-seg	640	54.4	45.5	387.0 ± 3.7	8.0 ± 0.1	28.0	139.8
YOLO26x-seg	640	56.5	47.0	787.0 ± 6.8	16.4 ± 0.1	62.8	313.5

mAP^val values are for single-model single-scale on the COCO val2017 dataset. See YOLO Performance Metrics for details.
Reproduce with yolo val segment data=coco.yaml device=0
Speed metrics are averaged over COCO val images using an Amazon EC2 P4d instance. CPU speeds measured with ONNX export. GPU speeds measured with TensorRT export.
Reproduce with yolo val segment data=coco.yaml batch=1 device=0|cpu

Semantic Segmentation (Cityscapes)

See the Semantic Segmentation Docs for usage examples. These models are trained on Cityscapes, including 19 classes.

Model	size ^(pixels)	mIoU^val	Speed ^{RTX3090 PyTorch (ms)}	params ^(M)	FLOPs ^(B)
YOLO26n-sem	1024 × 2048	78.3	4.4 ± 0.0	1.6	22.7
YOLO26s-sem	1024 × 2048	80.8	8.4 ± 0.0	6.5	88.8
YOLO26m-sem	1024 × 2048	82.0	19.9 ± 0.1	14.3	304.5
YOLO26l-sem	1024 × 2048	82.9	26.5 ± 0.1	17.9	384.7
YOLO26x-sem	1024 × 2048	83.6	48.9 ± 0.2	40.2	861.7

mIoU^val values are for single-model single-scale on the Cityscapes validation set.
Reproduce with yolo semantic val data=cityscapes.yaml device=0 imgsz=2048
Speed metrics are averaged over Cityscapes validation images using an RTX3090 instance.
Reproduce with yolo semantic val data=cityscapes.yaml batch=1 device=0|cpu imgsz=2048

Depth Estimation (NYU Depth V2)

See the Depth Estimation Docs for usage examples. These models are pretrained on a broad multi-dataset mix and evaluated on the NYU Depth V2 Eigen test split, predicting per-pixel depth in meters.

Model	size ^(pixels)	delta1^NYU	abs_rel^NYU	rmse^NYU	Speed ^{CPU ONNX (ms)}	Speed ^{T4 TensorRT10 (ms)}	params ^(M)	FLOPs ^(B)
YOLO26n-depth	768	0.882	0.109	0.414	272.0 ± 27.2	2.7 ± 0.1	6.4	46.9
YOLO26s-depth	768	0.896	0.104	0.399	393.7 ± 13.1	3.8 ± 0.0	13.2	67.9
YOLO26m-depth	768	0.921	0.089	0.364	621.5 ± 49.7	6.0 ± 0.1	23.3	130.7
YOLO26l-depth	768	0.930	0.083	0.351	821.9 ± 50.7	7.7 ± 0.1	27.7	157.2
YOLO26x-depth	768	0.933	0.080	0.344	1240.9 ± 73.3	13.6 ± 0.2	57.0	302.0

delta1^NYU is the percentage of pixels where the predicted depth is within a factor of 1.25 of the ground truth, on the NYU Depth V2 Eigen test split (654 images) with multi-scale + horizontal-flip TTA and log-least-squares alignment.
Single-scale accuracy without TTA is reproducible with yolo depth val model=yolo26n-depth.pt data=nyu-depth.yaml imgsz=768 device=0 (substitute model= for each size), which uses median (scale-only) alignment and scores lower: delta1 0.785 (n), 0.786 (s), 0.827 (m), 0.839 (l), 0.843 (x).
abs_rel is the mean absolute relative error between predicted and ground-truth depth values.
rmse is the root mean squared error in meters.
Speed is inference-only latency (pre/post-processing excluded) at imgsz=768, batch=1, reported as mean ± std over timed runs after warmup. CPU ONNX is ONNX Runtime fp32 on a 32-core Intel Xeon (Skylake); T4 TensorRT10 is TensorRT fp16 on a Tesla T4.
params and FLOPs are measured at 768×768, the training resolution of the released weights.

Classification (ImageNet)

Consult the Classification Docs for usage examples. These models are trained on ImageNet, covering 1000 classes.

Model	size ^(pixels)	acc ^top1	acc ^top5	Speed ^{CPU ONNX (ms)}	Speed ^{T4 TensorRT10 (ms)}	params ^(M)	FLOPs ^{(B) at 224}
YOLO26n-cls	224	71.4	90.1	5.0 ± 0.3	1.1 ± 0.0	2.8	0.5
YOLO26s-cls	224	76.0	92.9	7.9 ± 0.2	1.3 ± 0.0	6.7	1.6
YOLO26m-cls	224	78.1	94.2	17.2 ± 0.4	2.0 ± 0.0	11.6	4.9
YOLO26l-cls	224	79.0	94.6	23.2 ± 0.3	2.8 ± 0.0	14.1	6.2
YOLO26x-cls	224	79.9	95.0	41.4 ± 0.9	3.8 ± 0.0	29.6	13.6

acc values represent model accuracy on the ImageNet dataset validation set.
Reproduce with yolo val classify data=path/to/ImageNet device=0
Speed metrics are averaged over ImageNet val images using an Amazon EC2 P4d instance. CPU speeds measured with ONNX export. GPU speeds measured with TensorRT export.
Reproduce with yolo val classify data=path/to/ImageNet batch=1 device=0|cpu

Pose (COCO)

See the Pose Estimation Docs for usage examples. These models are trained on COCO-Pose, focusing on the 'person' class.

Model	size ^(pixels)	mAP^{pose 50-95(e2e)}	mAP^pose 50(e2e)	Speed ^{CPU ONNX (ms)}	Speed ^{T4 TensorRT10 (ms)}	params ^(M)	FLOPs ^(B)
YOLO26n-pose	640	57.2	83.3	40.3 ± 0.5	1.8 ± 0.0	2.9	7.5
YOLO26s-pose	640	63.0	86.6	85.3 ± 0.9	2.7 ± 0.0	10.4	23.9
YOLO26m-pose	640	68.8	89.6	218.0 ± 1.5	5.0 ± 0.1	21.5	73.1
YOLO26l-pose	640	70.4	90.5	275.4 ± 2.4	6.5 ± 0.1	25.9	91.3
YOLO26x-pose	640	71.6	91.6	565.4 ± 3.0	12.2 ± 0.2	57.6	201.7

mAP^val values are for single-model single-scale on the COCO Keypoints val2017 dataset. See YOLO Performance Metrics for details.
Reproduce with yolo val pose data=coco-pose.yaml device=0
Speed metrics are averaged over COCO val images using an Amazon EC2 P4d instance. CPU speeds measured with ONNX export. GPU speeds measured with TensorRT export.
Reproduce with yolo val pose data=coco-pose.yaml batch=1 device=0|cpu

Oriented Bounding Boxes (DOTAv1)

Check the OBB Docs for usage examples. These models are trained on DOTAv1, including 15 classes.

Model	size ^(pixels)	mAP^{test 50-95(e2e)}	mAP^test 50(e2e)	Speed ^{CPU ONNX (ms)}	Speed ^{T4 TensorRT10 (ms)}	params ^(M)	FLOPs ^(B)
YOLO26n-obb	1024	52.4	78.9	97.7 ± 0.9	2.8 ± 0.0	2.5	14.0
YOLO26s-obb	1024	54.8	80.9	218.0 ± 1.4	4.9 ± 0.1	9.8	55.1
YOLO26m-obb	1024	55.3	81.0	579.2 ± 3.8	10.2 ± 0.3	21.2	183.3
YOLO26l-obb	1024	56.2	81.6	735.6 ± 3.1	13.0 ± 0.2	25.6	230.0
YOLO26x-obb	1024	56.7	81.7	1485.7 ± 11.5	30.5 ± 0.9	57.6	516.5

mAP^test values are for single-model multiscale performance on the DOTAv1 test set.
Reproduce by yolo val obb data=DOTAv1.yaml device=0 split=test and submit merged results to the DOTA evaluation server.
Speed metrics are averaged over DOTAv1 val images using an Amazon EC2 P4d instance. CPU speeds measured with ONNX export. GPU speeds measured with TensorRT export.
Reproduce by yolo val obb data=DOTAv1.yaml batch=1 device=0|cpu

🧩 Integrations

Our key integrations with leading AI platforms extend the functionality of Ultralytics' offerings, enhancing tasks like dataset labeling, training, visualization, and model management. Discover how Ultralytics, in collaboration with partners like Weights & Biases, Comet ML, Roboflow, and Intel OpenVINO, can optimize your AI workflow. Explore more at Ultralytics Integrations.

🤝 Contribute

We thrive on community collaboration! Ultralytics YOLO wouldn't be the SOTA framework it is without contributions from developers like you. Please see our Contributing Guide to get started. We also welcome your feedback—share your experience by completing our Survey. A huge Thank You 🙏 to everyone who contributes!

We look forward to your contributions to help make the Ultralytics ecosystem even better!

📜 License

Ultralytics offers two licensing options to suit different needs:

AGPL-3.0 License: This OSI-approved open-source license is perfect for students, researchers, and enthusiasts. It encourages open collaboration and knowledge sharing. See the LICENSE file for full details.
Ultralytics Enterprise License: For development and production use, this license enables seamless integration of Ultralytics software and AI models into business products and services, including internal tools, automated workflows, and production deployments, bypassing the open-source requirements of AGPL-3.0. To get started, please contact us via Ultralytics Licensing.

📞 Contact

For bug reports and feature requests related to Ultralytics software, please visit GitHub Issues. For questions, discussions, and community support, join our active communities on Discord, Reddit, and the Ultralytics Community Forums. We're here to help with all things Ultralytics!

ultralytics 8.4.113