# OLMo 3 (32B)

> Scaled-up OLMo 3 keeps the same block design but moves to grouped-query attention.

| Property | Value |
| --- | --- |
| Lab | Ai2 (United States) |
| Released | 2025-11-20 |
| Decoder type | Dense |
| Family | Dense |
| Scale | 32B parameters |
| Context window | 65,536 tokens |
| Attention | GQA with QK-Norm and 3:1 sliding-window/global attention |
| Layer mix | 48 sliding-window + 16 global |
| KV cache / token (bf16) | 256 KiB (High) |
| License | Apache License 2.0 |

**Key detail:** Keeps post-norm while scaling width and applying YaRN only on global layers.

## Architecture concepts

- [QK-Norm (QK-Norm)](https://llm-atlas-7or.pages.dev/concepts/qk-norm.md): RMSNorm applied to queries and keys before attention to keep logits well-behaved.
- [Grouped-Query Attention (GQA)](https://llm-atlas-7or.pages.dev/concepts/gqa.md): Several query heads share one key/value head, shrinking the KV cache with little quality loss.
- [Sliding Window Attention (SWA)](https://llm-atlas-7or.pages.dev/concepts/swa.md): Some layers only attend to a local window of recent tokens instead of the whole context.

## Benchmark (Artificial Analysis Intelligence Index)

- AA Intelligence Index v4.3.2: total 6.5 (Scientific 3.2)

## Links

- Architecture diagram: https://sebastianraschka.com/llm-architecture-gallery/images/architectures/olmo-3-32b.webp
- View in article: https://magazine.sebastianraschka.com/p/the-big-llm-architecture-comparison#%C2%A715-olmo-3-thinking
- From scratch: https://github.com/rasbt/LLMs-from-scratch/tree/main/ch05/13_olmo3
- config.json: https://huggingface.co/allenai/Olmo-3-32B-Think/blob/main/config.json
- Tech report: https://arxiv.org/pdf/2512.13961
- Source card (source of truth): https://sebastianraschka.com/llm-architecture-gallery/#card-olmo-3-32b
- Web page: https://llm-atlas-7or.pages.dev/models/olmo-3-32b/
- JSON: https://llm-atlas-7or.pages.dev/api/models/olmo-3-32b.json

_Data from Sebastian Raschka's LLM Architecture Gallery (https://sebastianraschka.com/llm-architecture-gallery/). Synced 2026-11-04._