Allen Institute for AI

A US nonprofit AI research institute known for fully open models and embodied simulation environments.

Ai2 was founded in 2014 by Microsoft co-founder Paul Allen, is headquartered in Seattle, and operates as a nonprofit research institute; its current CEO is Ali Farhadi. Its hallmark is releasing weights, training data, and code all together as open source, with flagship projects including the language model OLMo and the vision-language model Molmo. On the embodied side, it built indoor simulation environments including AI2-THOR, ProcTHOR, and Holodeck; in 2025 it released MolmoAct, an action model that can reason in space, followed by MolmoAct 2 in May 2026, releasing its code and integrating with LeRobot. Students getting started with open-source VLA models often end up using its models and simulators.

ExampleWithin a few weeks of release, MolmoAct 2 had been downloaded more than 400,000 times and shipped with LeRobot integration.

Also called

AI2, Ai2

Related

MolmoAct · Molmo (Ai2) · AI2-THOR · ProcTHOR (Large-Scale Embodied AI Using Procedural Generation) · MolmoSpaces · Open-weight Model

Sources

MolmoAct 2: An open foundation for robots that work in the real world (Ai2)
Ai2 releases MolmoAct 2 (SiliconANGLE)

As of

2026-05