EfficientSAM3 v0.4.0 — Stage 3 Fine-Tuned Models & Full PCS Release

[SimonZeng7108]

What's New

Apologies for the Delay — Fine-Tuned Models Are Here!

We know it's been a while, but good things take time! We're happy to share that the fine-tuned EfficientSAM3 models are finally ready.

This release brings lightweight image encoders — EV-M, RV-M, and TV-M — trained end-to-end on 5% SA1B data with SACap labels for full Promptable Concept Segmentation (PCS) capabilities.

Model	Vision Encoder	Text Encoder	Decoder	Other	Total Params	vs ImageSAM3
EV-M	EfficientViT-B1 (22.2M)	MobileCLIP-S0 (42.5M)	21.0M	3.5M	89.2M	90% smaller
RV-M	RepViT-M1.1 (25.6M)	MobileCLIP-S0 (42.5M)	21.0M	3.5M	92.7M	89% smaller
TV-M	TinyViT-11M (28.3M)	MobileCLIP-S0 (42.5M)	21.0M	3.5M	95.3M	89% smaller

Note: ImageSAM3 comparison: Vision (463M) + Text (354M) + Decoder (30.3M) + Other (14.2M) = 861.5M

Grab the checkpoints on HuggingFace.

We've also given the README a clean-up — easier to navigate, clearer model descriptions, and better organized for contributors.

Three-Stage Progressive Distillation

EfficientSAM3 delivers a complete distillation pipeline:

• Stage 1: Compact encoder distillation on SA-1B (image) + Recap-DataComp-1B (text)
• Stage 3: End-to-end fine-tuning on SAM3 data for full PCS quality