405BNous Research is an American AI research company that began as an online collective and was formalised in 2023. It is known for the Hermes series of open-weight models post-trained from other labs' base models, and for the open-source Hermes Agent.
- Type
- Private company
- Founders
- Jeffrey Quesnelle, Karan Malhotra, Teknium and Shivani Mitra
- AI lab
Model family
Hermes
Nous Research is an American AI research company that began as an online collective and was formalised in 2023. It is known for the Hermes series of open-weight models post-trained from other labs' base models, and for the open-source Hermes Agent.
Latest Hermes models
Models in this family
2 catalogued models
2 models · 1–2
| Select models to compare | Model | Released | Context | Input /M | Output /M | Parameters | Type | I/O | Openness |
|---|---|---|---|---|---|---|---|---|---|
| Hermes 4 405BNous | August 26, 2025 | 131K | $1.00 | $3.00 | 405B | Text | text → text | Open weights | |
| Hermes 2 Pro Llama 3 8BNous | April 30, 2024 | 8K | — | — | 8B | Text | text → text | Open weights |