TWITTER_POST

Project Solaris presents a Minecraft-based multiplayer world-modeling stack built…

2026-02-26 · 16:46 UTC ·sainingxie ·1 min read

Brief

Project Solaris presents a Minecraft-based multiplayer world-modeling stack built around the claim that scalable world models must represent shared global state, not just render pixels from one viewpoint. The release combines a new data-collection engine, a multiplayer diffusion transformer trained on 12.6 million coordinated gameplay frames, and an evaluation setup that uses a vision-language model to assess multi-agent capabilities.

Source evidence

title: @sainingxie: world modeling is never about rendering pixels. rendering is local. world state ...
author: sainingxie
contenttype: twitterpost
published: 2026-02-26T16:46:08+00:00
source_url: https://x.com/sainingxie/status/2027115356318474661/photo/1

word_count: 202

Tweet by @sainingxie

world modeling is never about rendering pixels. rendering is local. world state is global. as soon as more than one agent exists, the only thing that truly matters is the shared representation beneath individual views. that shared representation is what scales into collective capability. this is why I'm super excited to share project Solaris -- our new work focused on building a multiplayer video world model in minecraft. This release includes three main pieces. 1⃣Solaris Engine, a fully featured multiplayer data collection system with built in visuals. the team put a huge amount of work into this since nothing like it really exists yet. https://github.com/solaris-wm/solaris-engine… 2⃣Solaris Model, a multiplayer DiT with a new memory efficient self forcing design, trained on 12.6M frames of coordinated Minecraft gameplay. https://github.com/solaris-wm/solaris… 3⃣Solaris Eval, which uses a VLM as a judge to evaluate different multiplayer capabilities. read the full technical breakdown by @ojmichel4 , and start building with Solaris. https://solaris-wm.github.io

Posted: 2026-02-26T16:46:08.000Z
Engagement: 481 likes, 68 retweets, 15 replies

Quoting @ojmichel4

Current world models aren't really modeling the world; they're modeling one agent's view of it. Partial observations ≠ world state.

Future world models will be independent of any one agent's perspective. You will be able to “drop in” any number of agents at any point in time,