Ai2 (Allen Institute for AI)

Ai2 (the Allen Institute for AI) is a non-profit AI research institute in Seattle, Washington, United States. It was founded in 2014 by the late Paul Allen, co-founder of Microsoft, and its first CEO was Oren Etzioni. Under US tax law it is a '501(c)(3)' organisation, run for public-benefit purposes such as science and education. It receives major funding from the Fund for Science and Technology, an Allen entity. After CEO Ali Farhadi stepped down in March 2026, founding member Peter Clark became interim CEO, and Ai2 still introduced him as interim CEO in a post published in May 2026.

Ai2 is not a company that sells products for profit; its aim is 'AI research for the common good'. It publishes training data and code along with its models, so that researchers and developers around the world can examine them and rebuild them. In August 2025 it began a project, supported by the US National Science Foundation (NSF) and NVIDIA, to build fully open AI that helps scientific research. It also runs Semantic Scholar, a service for searching research papers, and Asta, an AI tool that helps with research.

Its best-known work is OLMo, a 'fully open' language model. Ai2 releases not only the model files but also the training data, code and checkpoints saved partway through training. Olmo 3, released in November 2025, comes in two sizes, with 7 billion and 32 billion parameters (the adjustable values inside a model), and is published under the Apache 2.0 licence (a set of rules for use). Molmo, released in 2024, is a model that understands text and images together, and it too uses Apache 2.0. Ai2 says Olmo and Molmo are intended for research and education. Tülu 3 is a model for which Ai2 published the methods and data used to tune AI for conversation; the versions built on Meta's Llama 3.1 follow the Llama 3.1 licence.