| --- |
| license: odc-by |
| viewer: false |
| task_categories: |
| - text-generation |
| pretty_name: Bolmo Training Mix (December 2025) |
| language: |
| - en |
| configs: |
| - config_name: default |
| data_files: |
| - split: train |
| path: data/**/* |
|
|
| - config_name: cute_style_character |
| data_files: |
| - split: train |
| path: data/cute_style_character/**/* |
|
|
| - config_name: stack_edu |
| data_files: |
| - split: train |
| path: data/stack_edu-*/**/* |
|
|
| - config_name: common_crawl |
| data_files: |
| - split: train |
| path: data/common_crawl-*/**/* |
|
|
| - config_name: wikipedia |
| data_files: |
| - split: train |
| path: data/dolma_1_7-wiki-en/**/* |
|
|
| - config_name: extra_stack_edu |
| data_files: |
| - split: train |
| path: data/extra_stack_edu/**/* |
|
|
| - config_name: finemath-3plus |
| data_files: |
| - split: train |
| path: data/finemath-3plus/**/* |
|
|
| - config_name: olmocr_science_pdfs |
| data_files: |
| - split: train |
| path: data/olmocr_science_pdfs-*/**/* |
|
|
| - config_name: arxiv |
| data_files: |
| - split: train |
| path: data/rpj-proofpile-arxiv/**/* |
| --- |
| |
| # Bolmo Mix |
|
|
| Data used to train **Bolmo**, the first family of competitive fully open byte-level language models (LMs). |
|
|
| See our technical report for details: https://allenai.org/papers/bolmo. |
|
|
| | Name | Tokens | License | |
| |-------------------------|--------| ----------| |
| | Common Crawl | 121.0B | ODC-BY | |
| | olmOCR Science PDFs | 19.9B | ODC-BY | |
| | StackEdu | 26.3B | ODC-BY | |
| | FineMath 3+ | 4.1B | ODC-BY | |
| | arXiv | 1.3B | ODC-BY | |
| | Wikipedia & Wikibooks | 64.6M | ODC-BY | |
| | Character Understanding | 75.5M | ODC-BY | |
| | Total | **172.7B** | | |
|
|
| Bolmo models are trained for less than one epoch (~39.3B tokens) on this mix. |
|
|
| ## Licensing Information |
|
|
| Bolmo Mix is licensed under the Open Data Commons Attribution License v1.0 (ODC-By). It is intended for research and educational use. For more information, please see our [Responsible Use Guidelines](https://allenai.org/responsible-use). |
|
|
| ## Citation |
|
|
| ```bibtex |
| @misc{bolmo, |
| title={Bolmo: Byteifying the Next Generation of Language Models}, |
| author={Benjamin Minixhofer and Tyler Murray and Tomasz Limisiewicz and Anna Korhonen and Luke Zettlemoyer and Noah A. Smith and Edoardo M. Ponti and Luca Soldaini and Valentin Hofmann}, |
| year={2025}, |
| eprint={2512.15586}, |
| archivePrefix={arXiv}, |
| primaryClass={cs.CL}, |
| url={https://arxiv.org/abs/2512.15586}, |
| } |
| ``` |
