# ZAYA1-8B (8.4B)

> Zyphra's compact reasoning MoE pairs CCA/GQA attention updates with top-1 routed expert FFN updates to keep fewer than 1B parameters active per token.

| Property | Value |
| --- | --- |
| Lab | Zyphra (United States) |
| Released | 2026-05-06 |
| Decoder type | Sparse MoE |
| Family | Sparse MoE |
| Scale | 8.4B total, 760M active/token (9% active) |
| Context window | 131,072 tokens |
| Attention | CCA with 4:1 GQA, RoPE, and Q/K L2 norm |
| Layer mix | 40 CCA/GQA attention + 40 top-1 MoE FFN entries |
| KV cache / token (bf16) | 40 KiB (Low) |
| License | Apache License 2.0 |

**Key detail:** Key detail is CCA/GQA attention, which performs attention in a compressed latent space while keeping a 4:1 GQA layout. Sidenote: the config lists 80 alternating layer entries, equivalent to 40 CCA/GQA attention updates paired with 40 top-1 MoE FFN updates.

## Architecture concepts

- [Compressed Convolutional Attention (CCA)](https://llm-atlas-7or.pages.dev/concepts/compressed-convolutional-attention.md): Attention computed directly in a compressed latent space, with convolutional mixing.
- [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.

## Links

- Architecture diagram: https://sebastianraschka.com/llm-architecture-gallery/images/architectures/zaya1-8b.webp
- View in article: https://magazine.sebastianraschka.com/p/recent-developments-in-llm-architectures#%C2%A74-compressed-convolutional-attention-zaya1-8b
- config.json: https://huggingface.co/Zyphra/ZAYA1-8B/blob/main/config.json
- Tech report: https://arxiv.org/abs/2605.05365
- Source card (source of truth): https://sebastianraschka.com/llm-architecture-gallery/#card-zaya1-8b
- Web page: https://llm-atlas-7or.pages.dev/models/zaya1-8b/
- JSON: https://llm-atlas-7or.pages.dev/api/models/zaya1-8b.json

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