OLMo
OLMo is a model family from Ai2 (Allen Institute for AI)12, with 3 assessed releases in this catalog. Licenses and availability are recorded for each release, not for the family; its releases use the Apache License 2.0.
OLMo (styled Olmo in recent releases) is Ai2's series of open language models. Releases have included the first OLMo 1B and 7B models (February 2024), OLMoE (September 2024), OLMo 2 (November 2024 to May 2025), and Olmo 3 at 7B and 32B (November 2025), with Olmo 3.1 32B checkpoints added in December 2025. In March 2026 Ai2 also released Olmo Hybrid, a 7B model that mixes attention layers with linear RNN layers.156
- Website: OLMo project page (external site: allenai.org)
- Release notes: Olmo release notes (external site: docs.allenai.org)
- Paper: Olmo 3 technical report (arXiv 2512.13961) (external site: arxiv.org)
- Documentation: Olmo developer documentation (external site: docs.allenai.org)
Releases assessed
| Release | Weights | Tier (USASI rubric v0.2) | License | Released |
|---|---|---|---|---|
| Olmo 3 7B (base) | Weights: Public | Model-disclosure tier (USASI rubric v0.2): Open-stack | Apache-2.0, Apache-2.0 | Nov 20, 2025 |
| Olmo 3 7B Instruct | Weights: Public | Model-disclosure tier (USASI rubric v0.2): Open-stack | Apache-2.0, Apache-2.0, Apache-2.0 | Nov 20, 2025 |
| Olmo 3.1 32B Think | Weights: Public | Model-disclosure tier (USASI rubric v0.2): Open-stack | Apache-2.0, Apache-2.0, Apache-2.0 | Dec 12, 2025 |
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In the news
Ai2 releases OLMo-core 3, its open training library, with mixture-of-experts support
Ai2 released version 3 of OLMo-core, the PyTorch training library behind its Olmo models, on October 1, 2026. The release redesigns the library's mixture-of-experts training system, adding expert and pipeline parallelism, a distributed optimizer, grouped matrix multiplication for experts, and support for the MXFP8 number format; Ai2 says it is designed to scale mixture-of-experts training into the trillion-parameter range. The code is licensed under Apache 2.0, and the repository includes Ai2's official training scripts for Olmo 3.
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USASI. (2026, September 29). OLMo. United States of America Superintelligence. https://unitedstatesofamericasuperintelligence.com/open/olmo/
BibTeX
@misc{usasi_olmo,
author = {{USASI}},
title = {OLMo},
year = {2026},
month = sep,
howpublished = {\url{https://unitedstatesofamericasuperintelligence.com/open/olmo/}},
note = {United States of America Superintelligence. Last updated 2026-09-29}
}The date is when this page was last updated. Add the date you read it if your style needs one.
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