# Hermes (slim)

> Hermes, a family of models by Nous, listed from OpenRouter. Indexed, not reviewed: facts and our own checks, no score or ranking. 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…

- Full: https://www.anchorterminal.com/tools/hermes.md (~500 tokens) · this version ~430 tokens · JSON https://www.anchorterminal.com/tools/hermes.json · canonical https://www.anchorterminal.com/tools/hermes
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-04

# Hermes

> Indexed, not reviewed: facts from OpenRouter and our own checks. No score, grade or rank, and not in the rankings until the panel reviews it. How the index works: https://www.anchorterminal.com/indexed/

- Kind: model family, by Nous
- Category: Model APIs & inference (https://www.anchorterminal.com/categories/inference.md)
- Listed because: OpenRouter lists it, with prices from the providers that serve it.
- What OpenRouter says: 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...

## Models (3)

| Model | OpenRouter id | Released | Context | Input $/1M | Output $/1M | Supports |
| --- | --- | --- | --- | --- | --- | --- |
| Hermes 4 405B | `nousresearch/hermes-4-405b` | 2025-08 | 131k | $1 | $3 | reasoning |
| Hermes 3 70B Instruct | `nousresearch/hermes-3-llama-3.1-70b` | 2024-08 | 131k | $0.70 | $0.70 | structured output |
| Hermes 3 405B Instruct | `nousresearch/hermes-3-llama-3.1-405b` | 2024-08 | 131k | $1 | $1 | structured output |

Prices and limits as OpenRouter lists them; a provider's own price can differ.

- JSON: https://www.anchorterminal.com/api/v1/tools/hermes.json
- Being indexed says nothing about quality, and nobody can pay for it. Ask for a review: https://www.anchorterminal.com/builders/#claiming