Model
Inference & Serving
OLMo 2
1Ai2's 2fully 3open 4reproducible 5language 6model
the six Ws · specification
W1
Who
The Allen Institute for AI (Ai2) developed the OLMo 2 model family.
W2
What
OLMo 2 is a fully open LLM family (1B, 7B, 13B, 32B) released with weights, training code, data, and logs.
W3
Where
Available on GitHub at allenai/OLMo and on Hugging Face under the allenai organization.
W4
When
OLMo 2 released in November 2024, with the 32B variant following in March 2025.
W5
Why
Built to give researchers complete transparency into pretraining data and methodology, not just final weights.
W6
With
Trainable and runnable via the OLMo-core codebase or Hugging Face Transformers.
W7
Watch
Apache 2.0 license, fully open weights, training data, and code with no gating, no credentials required, self-hosted; maintained by the Allen Institute for AI.