# Nemotron 3 Nano (4B)

> Compact on-device hybrid that compresses Nemotron Nano 9B v2 into a mostly Mamba-2 stack with only four attention layers.

| Property | Value |
| --- | --- |
| Lab | NVIDIA (United States) |
| Released | 2026-03-16 |
| Decoder type | Dense hybrid |
| Family | Dense hybrid |
| Scale | 4B parameters |
| Context window | 262,144 tokens |
| Attention | GQA with only 4 attention layers |
| Layer mix | 4 GQA + 21 Mamba-2 + 17 FFN |
| KV cache / token (bf16) | 16 KiB (Very low) |
| License | NVIDIA Nemotron Open Model License |

**Key detail:** Uses a 42-layer stack with 21 Mamba-2 blocks, 17 ReLU² FFNs, and just 4 GQA layers.

## Architecture concepts

- [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.
- [Hybrid Attention (Hybrid attention)](https://llm-atlas-7or.pages.dev/concepts/hybrid-attention.md): Mixes cheap linear-attention or state-space layers with a few full-attention layers.

## Benchmark (Artificial Analysis Intelligence Index)

- AA Intelligence Index v5.0: total 1.8 (Knowledge Work 0.2, Coding 0, Science 0, General 7.1)
- AA Intelligence Index v4.3.2: total 4.8 (General 8.8, Scientific 2.4, Coding 8, Agents 0.1)

## Links

- Architecture diagram: https://sebastianraschka.com/llm-architecture-gallery/images/architectures/nemotron-3-nano-4b.webp
- config.json: https://huggingface.co/nvidia/NVIDIA-Nemotron-3-Nano-4B-BF16/blob/main/config.json
- License: https://www.nvidia.com/en-us/agreements/enterprise-software/nvidia-nemotron-open-model-license/
- Tech report: https://huggingface.co/blog/nvidia/nemotron-3-nano-4b
- Source card (source of truth): https://sebastianraschka.com/llm-architecture-gallery/#card-nemotron-3-nano-4b
- Web page: https://llm-atlas-7or.pages.dev/models/nemotron-3-nano-4b/
- JSON: https://llm-atlas-7or.pages.dev/api/models/nemotron-3-nano-4b.json

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