Farewell Ai2
| Source: Interconnects (Nathan Lambert)
Tags: Ai2, Allen Institute for AI, OLMo, Nathan Lambert, open source, post-training
Nathan Lambert, who led post-training research on Ai2's OLMo open-source language models, is leaving the Allen Institute for AI to work on coordinating the open AI ecosystem — a notable departure from one of the field's most prominent open-model research institutions.
Details
Nathan Lambert has left the Allen Institute for AI (Ai2), where he led post-training work on the OLMo (Open Language Model) series — one of the most significant fully open large language model efforts, notable for releasing the complete training pipeline, not just weights. Lambert joined after meeting a colleague at ICML 2023 in Hawaii and describes Ai2 as transformative for his research career. In a farewell note to the company, Lambert highlighted Ai2's unique position between academia and industry as critical infrastructure for the open AI ecosystem, urging the organization to remain ambitious and independent as AI becomes 'more geopolitical, socially disruptive, and central to the economy.' Lambert says he will remain in Seattle and continue working to make the open AI ecosystem 'better coordinated and more useful' — his next steps appear focused on ecosystem-level coordination rather than a move to a major closed AI lab. His departure is worth noting for the open-source community: OLMo's influence extended beyond raw performance to serving as a reference implementation for transparent, reproducible large model development.