Open-Source World Models

AlayaWorld

Alaya Lab

Interactive autoregressive world model with real-time camera control, prompt switching, and long-horizon memory consistency. Open-source, sustains interactive play past the one-minute mark.

Cosmos 3

NVIDIA

Omnimodal world-model family for physical AI spanning language, image, video, audio and action.

HY-World 1.5 (WorldPlay)

Tencent Hunyuan

Tencent Hunyuan's streaming video diffusion model for real-time, interactive world modeling with long-term geometric consistency, released as WorldPlay. Given a single image or text prompt, it generates a next-chunk (16-frame) video prediction conditioned on live user keyboard/mouse actions, dynamically reconstituting context memory from past frames to keep the world geometrically consistent over long sessions. Runs at up to 24fps in first- or third-person, across real-world and stylized scenes. Open-sourced (code, weights, and full training pipeline). Predecessor to, and released separately from, the later HY-World 2.0.

1 world on QuantWorlds

HY-World 2.0

Tencent Hunyuan

Multi-modal world model framework for world generation and world reconstruction — accepts text, single-view images, multi-view images, and video to produce editable, persistent 3D world representations (meshes / 3D Gaussian Splatting) compatible with game engines (Blender, Unity, Unreal).

LTX-2.5

Lightricks

Lightricks' 22-billion-parameter open-weights audio-video generation model, released August 11, 2026. Turns text, image, and video inputs into synchronized, high-fidelity video and audio in a single pass, including native multishot generation (connected scenes with consistent character/style across cuts). Positioned by Lightricks and press coverage as a "world model" for video, robotics and simulation, distinct from this catalogue's live-interactive world models (Marble, MIRA, PAN, WorldPlay) — see research notes for the classification nuance.

Matrix-Game 3.0

Skywork AI

Real-time and streaming interactive world model with long-horizon memory, for controllable game world generation.

Waypoint-1.5

Overworld

Overworld's real-time video world model for consumer GPUs: a 1.2B-parameter autoregressive diffusion transformer generating interactive 720p/60fps video from keyboard and mouse input, with a 512-frame context window. Released open-weight under Apache 2.0 on Hugging Face in 1B and 1B-360P tiers. The hosted overworld.stream platform requires an account to play; the model weights themselves do not.