{"slug": "dreamer-4", "name": "Dreamer 4", "category": "ai-models", "category_name": "AI models", "description": "", "recommenders": 3, "commenters": 4, "warners": 0, "score": 2.663, "rising": -0.98, "first": "2025-11-12", "latest": "2025-12-24", "why": "The best world model research I know of today is Dreamer 4", "why_is_quote": true, "has_verdict": false, "sentiment": {"recommend": 3, "neutral": 1, "compare": 0, "warn": 0}, "spark": [2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], "listed": true, "loved": [], "caveat": "", "short_quote": "The best world model research I know of today is Dreamer 4", "kind": "", "icon": true, "domain": "danijar.com", "github_repo": null, "official_url": "https://danijar.com/project/dreamer4/", "pricing": "", "aliases": ["Dreamer 4"], "verdict": null, "praise": [{"label": "", "summary": "", "quotes": [{"id": 742123328, "item_id": 46382708, "url": "https://news.ycombinator.com/item?id=46382708", "by": "blueblisters", "date": "2025-12-24", "version": "4", "stance": "recommend", "quote": "Dreamer4 (https://danijar.com/project/dreamer4/) is a promising direction", "excerpt": "Dreamer4 (https://danijar.com/project/dreamer4/) is a promising direction (by a frontier lab)", "context": "", "use_case": "", "switched_from": "", "story": "The dawn of a world simulator"}, {"id": 735199248, "item_id": 45949953, "url": "https://news.ycombinator.com/item?id=45949953", "by": "mashyc", "date": "2025-11-16", "version": "4", "stance": "recommend", "quote": "You'd be interested in Dreamer 4", "excerpt": "You'd be interested in Dreamer 4, very recently the first AI to acquire diamonds in Minecraft purely from offline knowledge: https://danijar.com/project/dreamer4/", "context": "", "use_case": "", "switched_from": "", "story": "SIMA 2: An agent that plays, reasons, and learns with you in virtual 3D worlds"}, {"id": 734426480, "item_id": 45901655, "url": "https://news.ycombinator.com/item?id=45901655", "by": "modeless", "date": "2025-11-12", "version": "4", "stance": "recommend", "quote": "The best world model research I know of today is Dreamer 4", "excerpt": "The best world model research I know of today is Dreamer 4: https://danijar.com/project/dreamer4/. Here is an interesting interview with the author: https://www.talkrl.com/episodes/danijar-hafner-on-dreamer-v4 Training on 2,500 hours of prerecorded video of people playing Minecraft, they produce a neural net world model of Minecraft. It is basically a learned Minecraft simulator. 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By training inside of its world model, Dreamer 4 is the first agent to obtain diamonds in Minecraft purely from offline data, aligning it with applications such as robotics where online interaction is often impractical.\" In other words,", "context": "", "use_case": "", "switched_from": "", "story": "SIMA 2: An agent that plays, reasons, and learns with you in virtual 3D worlds"}, {"id": 734426480, "item_id": 45901655, "url": "https://news.ycombinator.com/item?id=45901655", "by": "modeless", "date": "2025-11-12", "version": "4", "stance": "recommend", "quote": "The best world model research I know of today is Dreamer 4", "excerpt": "The best world model research I know of today is Dreamer 4: https://danijar.com/project/dreamer4/. Here is an interesting interview with the author: https://www.talkrl.com/episodes/danijar-hafner-on-dreamer-v4 Training on 2,500 hours of prerecorded video of people playing Minecraft, they produce a neural net world model of Minecraft. It is basically a learned Minecraft simulator. You can actually play Minecraft in it", "context": "", "use_case": "world model research", "switched_from": "", "story": "Yann LeCun to depart Meta and launch AI startup focused on 'world models'"}]}