# Soofi S (30B-A3B)

> German-English base model that retrains the Nemotron 3 Nano architecture on 26.68T tokens with a fully documented data mixture.

| Property | Value |
| --- | --- |
| Lab | SOOFI Consortium (Germany) |
| Released | 2026-07-10 |
| Decoder type | Hybrid MoE |
| Family | Hybrid MoE |
| Scale | 31.6B total, 3.2B active (10.1% active) |
| Context window | 1,048,576 tokens |
| Attention | Mostly Mamba-2 with 6 GQA layers and no positional embeddings (NoPE) |
| Layer mix | 6 GQA + 23 Mamba-2 + 23 MoE |
| KV cache / token (bf16) | 6 KiB (Very low) |
| License | Custom license (preview) |

**Key detail:** Reuses the Nemotron 3 Nano architecture without modification, isolating the effect of a German-English data and training recipe.

## Architecture concepts

- [No Positional Embeddings (NoPE)](https://llm-atlas-7or.pages.dev/concepts/nope.md): Some or all layers drop explicit positional encodings and rely on the causal mask.
- [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.
- [Mixture of Experts (MoE)](https://llm-atlas-7or.pages.dev/concepts/moe.md): Many feed-forward experts, but a router sends each token to only a few of them.
- [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.

## Links

- Architecture diagram: https://sebastianraschka.com/llm-architecture-gallery/images/architectures/soofi.webp
- config.json: https://huggingface.co/Soofi-Project/Soofi-S-Base/blob/main/config.json
- License: https://huggingface.co/Soofi-Project/Soofi-S-Base#license-terms-of-use
- Tech report: https://arxiv.org/abs/2607.09424
- Source card (source of truth): https://sebastianraschka.com/llm-architecture-gallery/#card-soofi-s-30b-a3b
- Web page: https://llm-atlas-7or.pages.dev/models/soofi-s-30b-a3b/
- JSON: https://llm-atlas-7or.pages.dev/api/models/soofi-s-30b-a3b.json

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