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## What it is

NVIDIA just released Cosmos 3, an open foundation model for Physical AI that natively understands and generates across text, images, video, ambient sound, and actions — all in one model. It’s built on a two-tower Mixture-of-Transformers: an autoregressive transformer handles physical reasoning while a diffusion transformer handles multimodal generation. The point is leading physics accuracy, so robots and autonomous systems can train and be evaluated in simulated worlds that actually obey gravity, momentum, and contact.

## Why it matters

NVIDIA claims open-source state-of-the-art on R-Bench, PAI-Bench, Physics-IQ, and RoboLab, and says Cosmos 3 cuts physical-AI training and evaluation cycles from months to days by generating synthetic data and testing policies in realistic environments. It ships fully open — weights, datasets, and tools — aimed at robots, autonomous vehicles, and smart infrastructure. World models have been a running theme in 2026; Cosmos 3 is the first to unify physical reasoning, world generation, and action generation in a single open release.