---
license: other
license_name: sam-license
license_link: LICENSE
pipeline_tag: mask-generation
tags:
  - sam3
  - image-segmentation
  - mirror
library_name: sam3
---

# SAM 3 — unofficial checkpoint mirror

This repository mirrors Meta's unmodified SAM 3 `sam3.pt` checkpoint for local
image-segmentation inference. It is maintained by `squarefk`, not by Meta, and
is not an official release or endorsement. The original authors retain their
rights. This mirror does not relicense the model.

## Provenance

Recorded on 2026-10-14; this is a pinned snapshot, not a claim of the latest release.

| Field | Value |
| --- | --- |
| Original model | [facebook/sam3](https://huggingface.co/facebook/sam3) |
| Original weights revision | [3c879f39826c281e95690f02c7821c4de09afae7](https://huggingface.co/facebook/sam3/blob/3c879f39826c281e95690f02c7821c4de09afae7/sam3.pt) |
| File | `sam3.pt` |
| Size | 3,450,062,241 bytes |
| SHA-256 | `9999e2341ceef5e136daa386eecb55cb414446a00ac2b55eb2dfd2f7c3cf8c9e` |
| Tested upstream source | [660a5e9e1b8b4c02c0ad97229b88a09a6e4ff5b7](https://github.com/facebookresearch/sam3/tree/660a5e9e1b8b4c02c0ad97229b88a09a6e4ff5b7) |
| Modifications to weights | None |

## License and permitted use

The weights remain governed by the complete [SAM License](LICENSE), last updated
November 19, 2025. Section 1(a) grants redistribution rights; section 1(b)(i)
requires redistribution under that agreement with a copy of it. This repository
includes the unmodified agreement. It is not an MIT or Apache-2.0 relicense.

All original terms apply, including research attribution, privacy, trade controls,
and prohibited uses. Do not use the model for the military, warfare, espionage,
weapons or other prohibited end uses specified in section 1(b)(v). Public access
does not remove these restrictions. Review the full license before use or further
redistribution. Model functionality is image segmentation, not image generation.

## Usage and updates

Use the checkpoint with the [upstream SAM 3 code](https://github.com/facebookresearch/sam3)
and its image processor. The `.pt` file is the original upstream PyTorch checkpoint,
not a Transformers `save_pretrained` directory. Do not assume the Hub's generic
Transformers examples apply to this file.

For newer releases, check the [upstream announcements](https://github.com/facebookresearch/sam3#latest-updates)
and [weight history](https://huggingface.co/facebook/sam3/commits/main). Compare
weight hashes as well as source revisions. This mirror does not update automatically.