Hermes 4
language modelNous Research
Hermes 4 is a large-scale reasoning model built on Meta-Llama-3.1-405B and released by Nous Research. It introduces a hybrid reasoning mode, where the model can choose to deliberate internally with...
Key facts
| Made by | Nous Research |
|---|---|
| Type | language model |
| Released | August 26, 2025 |
| Reads at once | 131,072 tokens |
| Price (API, per million tokens) | $1 in · $3 out |
| Input → output | text → text |
| Sizes | 405B |
Questions about Hermes 4
Who makes Hermes 4?
Hermes 4 is made by Nous Research.
When was Hermes 4 released?
We first saw Hermes 4 listed on August 26, 2025.
How much does Hermes 4 cost?
Through OpenRouter it costs $1 per million input tokens and $3 per million output tokens. Prices change, so check the provider before you build on it.
How much text can Hermes 4 read at once?
Up to 131,072 tokens, roughly 98.3K words.
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