What it is
OLMo-2-0425-1B-Instruct is a language model for chat, drafting and question answering, published by the Allen Institute for AI (Ai2) on Hugging Face on 29 April 2025. It has about 1.5 billion parameters and a configured context window of 4,096 tokens.
Its card lists the licence as Apache 2.0. In short, the licence allows commercial use, modification and redistribution, with attribution and a copy of the licence, and includes a patent grant.
Hugging Face counted about 65,626 downloads of it in the 30 days before we checked (7 Oct 2026), and 57 people have liked it there.
It is built on allenai/OLMo-2-0425-1B-RLVR1, according to its card.