Model comparison · YOLO11 vs YOLOv9
YOLO11 vs YOLOv9
A head-to-head of YOLO11 and YOLOv9: published COCO accuracy, model sizes, architecture (anchor-free, NMS-free), supported tasks and license — so you can pick the right detector for your project.
The verdict: On accuracy they're effectively tied (51.5 vs 51.4 COCO val2017 mAP50-95 @ 640px). YOLO11 covers 5 vision tasks to YOLOv9's 2. For a new build, YOLO11 is the stronger pick — newer, and at least as versatile; reach for YOLOv9 mainly for its specific ecosystem or license fit.
YOLO11 51.5 vs YOLOv9 51.4 COCO val2017 mAP50-95 @ 640px — a statistical tie.
Released 2024. C3k2 blocks + C2PSA spatial attention.
Same inference path, so export complexity is similar.
YOLO11 vs YOLOv9: accuracy
COCO val2017 mAP50-95 @ 640px, higher is better. The number on the right is parameter count (smaller is lighter). These are the authors' published figures — indicative of tier, not a re-run benchmark.
Smallest variant (nano tier)
Medium variant
Side-by-side specs
Architecture, tasks, sizes and license for both models. Tracking (BoT-SORT / ByteTrack) is an Ultralytics ecosystem feature available to every integrated model.
| Model | Year | Anchor-free | NMS-free | Tasks | Nano mAP | Medium mAP | License |
|---|---|---|---|---|---|---|---|
| YOLO11 | 2024 | Yes | No | 5 (Detect, Segment, Classify, Pose, OBB) | 39.5 | 51.5 | AGPL-3.0 |
| YOLOv9 | 2024 | Yes | No | 2 (Detect, Segment) | 38.3 | 51.4 | GPL-3.0 (Ultralytics build: AGPL-3.0) |
The two models in depth
YOLO11
2024 · UltralyticsThe all-round Ultralytics default across five vision tasks.
YOLO11 is the mainstream Ultralytics model: anchor-free, well-documented, and supporting all five vision tasks. Its C3k2 blocks and C2PSA attention let YOLO11m match YOLOv8m accuracy with about 22% fewer parameters, which makes it the safe, best-supported default for most production work today.
- Key idea
- C3k2 blocks + C2PSA spatial attention
- Best for
- The best-documented general-purpose default for production.
- Sizes
- n, s, m, l, x
- + Excellent accuracy-per-parameter
- + All five tasks, huge docs & community
- + Battle-tested across production deployments
- − Still needs NMS (not end-to-end)
- − YOLO26 now edges it on published accuracy
YOLOv9
2024 · Academia Sinica (Wang et al.)Fixes deep-network information loss with PGI + GELAN.
YOLOv9 (Academia Sinica, ECCV 2024) tackles the information bottleneck in deep networks with Programmable Gradient Information (PGI) and the Generalized ELAN (GELAN) architecture. It delivers high accuracy at low parameter counts and is integrated into Ultralytics for detection and segmentation.
- Key idea
- Programmable Gradient Information (PGI) + GELAN
- Best for
- Squeezing high accuracy out of a small parameter budget.
- Sizes
- t, s, m, c, e
- + Excellent accuracy for very few parameters
- + PGI improves training of deep models
- + Detection + segmentation via Ultralytics
- − No pose / classify / OBB
- − GPL-3.0 original repo is more restrictive
Other head-to-head comparisons
More matchups involving YOLO11 and YOLOv9, each with the same spec, accuracy and architecture breakdown.
How this comparison is built
- Published numbers only. Every mAP and parameter figure is the model authors' own published value (COCO val2017 mAP50-95 @ 640px), linked from each model's card — nothing here is measured on this site.
- Indicative, not a controlled benchmark. The families use different size ladders (YOLOv9's smallest is
t, YOLOv7 has no standard medium, YOLOv5's figures are the original anchor-based release), so cross-family mAP shows the tier, not a like-for-like race. Benchmark your shortlist on your own data. - Architecture facts. Anchor-free, NMS-free, tasks and license reflect each model as officially released.
- Want a real speed test? See the YOLO tracker benchmarks for measured FPS across 10 GPUs, or book a consultation to benchmark models on your footage.
From the blog
Tutorials, code, and notes on computer vision, deep learning, and applied AI.
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How to count people in zones with YOLO26 and OpenCV
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YOLO26 vs YOLO11: Real-time ONNX FPS benchmark in Python
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Ultralytics object trackers comparison: ByteTrack, BoT-SORT & More
How do the six Ultralytics trackers actually behave on the same footage? A look at BoT-SORT, ByteTrack, OC-SORT, Deep OC-SORT, FastTrack, and TrackTrack, their internals, trade-offs, and side-by-side results on ID switches, ID stability, and FPS.
Object tracking and trajectory forecasting with YOLO26 and ByteTrack
Detect, track, and predict the future path of people and vehicles using Ultralytics YOLO26, ByteTrack, and a lightweight velocity-based forecasting model.
Real time bird detection and tracking using YOLO11
Learn how to detect and track birds using Ultralytics YOLO11 for real-time monitoring and ecological research through computer vision.
How to count people in zones with YOLO26 and OpenCV
A practical walkthrough of a compact Python script that detects, tracks, and counts people inside polygon zones using Ultralytics YOLO26 and OpenCV.
Supermarket items segmentation and counting with YOLO11
Discover how to achieve advanced items segmentation in supermarkets with Ultralytics YOLO11 for efficient object detection and analysis.
How to generate accurate segmentation masks using object detection and Meta SAM2
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Frequently asked questions
- Which YOLO model is the most accurate?
- By published COCO mAP at a comparable size, YOLO26 leads (53.1 mAP for the medium model), just ahead of YOLO11 (51.5) and YOLOv9 (51.4). All numbers here are the authors' own published figures at 640px, not a re-run benchmark, so treat small gaps as ties and test on your own data.
- What is the difference between anchor-free and NMS-free?
- Anchor-free means the model predicts boxes directly instead of refining pre-set anchor boxes (YOLOv8 onward). NMS-free (end-to-end) goes further: the model outputs final detections with no Non-Maximum-Suppression post-processing step, which simplifies export and cuts latency. YOLOv10 and YOLO26 are NMS-free; YOLOv8, YOLOv9 and YOLO11 still use NMS.
- Should I use YOLO11 or YOLO26?
- YOLO11 is the safest default today: it has the largest community, the most tutorials, and covers all five tasks. YOLO26 is newer, posts higher published accuracy, and is NMS-free and DFL-free for cleaner edge and CPU deployment. Choose YOLO11 for maximum support, YOLO26 for a fresh build that wants the newest architecture.
- Are these mAP numbers directly comparable across models?
- They are indicative, not a controlled benchmark. Every figure is the authors' own published COCO val2017 mAP at 640px, but the families don't share the same size ladder (YOLOv9's smallest is 't', YOLOv7 has no 'medium', YOLOv5's numbers are the original anchor-based release). Use them to see the general tier, then benchmark the shortlist on your own hardware and data.
- Which YOLO license can I use commercially?
- Most models here are AGPL-3.0 (Ultralytics YOLOv5, YOLOv8, YOLOv10, YOLO11, YOLO26), which requires open-sourcing derivative network-served applications unless you buy an Ultralytics Enterprise license. YOLOv7 and the original YOLOv9 repo are GPL-3.0. Always check the license against your deployment before shipping.