{"slug": "sam-3", "name": "SAM 3", "category": "ai", "category_name": "AI models and assistants", "description": "", "recommenders": 1, "commenters": 3, "warners": 1, "score": 0.107, "rising": -0.33, "first": "2025-11-19", "latest": "2026-07-21", "why": "The native support for streaming in SAM3 is awesome.", "why_is_quote": true, "has_verdict": false, "sentiment": {"recommend": 1, "neutral": 1, "compare": 0, "warn": 1}, "spark": [1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], "listed": false, "loved": [], "caveat": "", "short_quote": "The native support for streaming in SAM3 is awesome.", "icon": false, "domain": null, "github_repo": "github.com/facebookresearch/sam3", "official_url": "https://github.com/facebookresearch/sam3", "pricing": "", "aliases": ["SAM 3", "SAM3"], "verdict": null, "praise": [{"label": "", "summary": "", "quotes": [{"id": 735786656, "item_id": 45986666, "url": "https://news.ycombinator.com/item?id=45986666", "by": "tom-in-july", "date": "2025-11-19", "stance": "recommend", "quote": "The native support for streaming in SAM3 is awesome.", "excerpt": "The native support for streaming in SAM3 is awesome. Especially since it should also remove some of the memory accumulation for long sequences. I used SAM2 for tracking tumors in real-time MRI images. With the default SAM2 and loading images from the da, we could only process videos with 10^2 - 10^3 frames before running out of memory. By developing/adapting a custom version (1) based on a modified implementation wit", "context": "medical imaging researcher", "use_case": "video segmentation with streaming", "switched_from": "SAM2", "story": "Meta Segment Anything Model 3"}]}], "caveats": [{"label": "", "summary": "", "quotes": [{"id": 783951888, "item_id": 48996993, "url": "https://news.ycombinator.com/item?id=48996993", "by": "commoner", "date": "2026-07-21", "stance": "warn", "quote": "Meta's models are not open source because their weights always come with weird restrictions.", "excerpt": "Whenever Meta claims their models are open source, you have to double-check. SAM License (https://github.com/facebookresearch/sam3/blob/main/LICENSE): > iv. Your use of the SAM Materials will not involve or encourage others to reverse engineer, decompile or discover the underlying components of the SAM Materials. > v. You are not the target of Trade Controls and your use of SAM Materials must comply with Trade Contro", "context": "", "use_case": "", "switched_from": "", "story": "Meta's AI Models Are Powering the First Wave of Genesis Mission Projects"}]}], "who": [{"by": "tom-in-july", "context": "medical imaging researcher", "url": "https://news.ycombinator.com/item?id=45986666", "date": "2025-11-19"}], "tags": [], "use_cases": ["text-prompted segmentation", "video segmentation with streaming"], "compared": [{"slug": "sam", "name": "SAM", "co": 2, "switched_from": 1, "switched_to": 0}], "makers": [], "threads": [{"url": "https://news.ycombinator.com/item?id=45982073", "title": "Meta Segment Anything Model 3", "mentions": 2}, {"url": "https://news.ycombinator.com/item?id=48995074", "title": "Meta's AI Models Are Powering the First Wave of Genesis Mission Projects", "mentions": 1}], "sentiment_by_month": {"2025-11": {"recommend": 1, "neutral": 1}, "2025-12": {}, "2026-01": {}, "2026-02": {}, "2026-03": {}, "2026-04": {}, "2026-05": {}, "2026-06": {}, "2026-07": {"warn": 1}, "2026-08": {}, "2026-09": {}, "2026-10": {}}, "quotes": [{"id": 783951888, "item_id": 48996993, "url": "https://news.ycombinator.com/item?id=48996993", "by": "commoner", "date": "2026-07-21", "stance": "warn", "quote": "Meta's models are not open source because their weights always come with weird restrictions.", "excerpt": "Whenever Meta claims their models are open source, you have to double-check. SAM License (https://github.com/facebookresearch/sam3/blob/main/LICENSE): > iv. Your use of the SAM Materials will not involve or encourage others to reverse engineer, decompile or discover the underlying components of the SAM Materials. > v. You are not the target of Trade Controls and your use of SAM Materials must comply with Trade Contro", "context": "", "use_case": "", "switched_from": "", "story": "Meta's AI Models Are Powering the First Wave of Genesis Mission Projects"}, {"id": 735808289, "item_id": 45988018, "url": "https://news.ycombinator.com/item?id=45988018", "by": "featureofone", "date": "2025-11-19", "stance": "neutral", "quote": "the new text prompt input seams nice", "excerpt": "The SAM models are great. I used the latest version when building VideoVanish ( https://github.com/calledit/VideoVanish ) a video-editing GUI for removing or making objects vanish from videos. That used SAM 2, and in my experience SAM 2 was more or less perfect\u2014I didn\u2019t really see the need for a SAM 3. Maybe it could have been better at segmenting without input. But the new text prompt input seams nice; much easier t", "context": "", "use_case": "text-prompted segmentation", "switched_from": "", "story": "Meta Segment Anything Model 3"}, {"id": 735786656, "item_id": 45986666, "url": "https://news.ycombinator.com/item?id=45986666", "by": "tom-in-july", "date": "2025-11-19", "stance": "recommend", "quote": "The native support for streaming in SAM3 is awesome.", "excerpt": "The native support for streaming in SAM3 is awesome. Especially since it should also remove some of the memory accumulation for long sequences. I used SAM2 for tracking tumors in real-time MRI images. With the default SAM2 and loading images from the da, we could only process videos with 10^2 - 10^3 frames before running out of memory. By developing/adapting a custom version (1) based on a modified implementation wit", "context": "medical imaging researcher", "use_case": "video segmentation with streaming", "switched_from": "SAM2", "story": "Meta Segment Anything Model 3"}]}