Simon Willison • 11/23/2025

Olmo 3 is a fully open LLM

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The Allen Institute for AI (AI2) released Olmo 3, a series of fully open large language models. Unlike typical open-weight models, Olmo 3 provides complete transparency including training data (Dolma 3 corpus), code, and checkpoints. It features a 32B 'thinking' model that allows inspection of intermediate reasoning traces, plus 7B variants. The article details its training on 5.9 trillion tokens with enhanced code/math data and includes a hands-on test generating SVG code.

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#open source #AI Research #Training Data
Olmo 3 is a fully open LLM

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