Ai2, formerly the Allen Institute for Artificial Intelligence, is an AI research organization focused on building open AI models, datasets, tools, and research resources. Its work includes the OLMo family of fully open language models, Molmo multimodal models, Tülu instruction-following models, and Asta scientific AI agents. Ai2 provides developers with access to model weights, training data, source code, evaluation tools, checkpoints, and training recipes, allowing them to study, customize, and build applications with its technology. Its developer ecosystem also includes APIs, documentation, evaluation frameworks, and open-source tools for model development. Ai2's research spans language, multimodal AI, scientific discovery, robotics, climate, and planetary applications.

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