---
license: mit
tags: [document-layout, yolo26, onnx, doclaynet]
---

# sc-layout-models

ONNX exports of [Armaggheddon/yolo26-document-layout](https://huggingface.co/Armaggheddon/yolo26-document-layout)
(MIT), used as the default layout detector by `sc_toolkit`'s hybrid PDF parser.

Exported with `tools/export_layout_onnx.py` from the sc_toolkit repo:
imgsz=1280, opset=17, simplified, `names` class metadata embedded. Served
through `onnxruntime` (MIT); `ultralytics` is used at export time only and is
not required to run these files.

| file | variant | size |
|---|---|---|
| `yolo26m_doc_layout.onnx` | m — the sc_toolkit default | ~82 MB |
| `yolo26n_doc_layout.onnx` | n — the cheap option (`HYBRID_LAYOUT_MODEL=superchaintech/sc-layout-models#yolo26n_doc_layout.onnx`) | ~10 MB |

Known deviation from the source weights (measured, sc_toolkit repo,
`docs/layout-model-comparison-2026-08.md`): the ONNX decode agrees with the
ultralytics runtime on ~98% of regions at IoU≥0.5 and can differ on the rest.