# Nous: Hermes 4 405B — Use via Hanzo AI API

> 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,... Access via Hanzo's OpenAI-compatible API. Context: 131K. Get started free.

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# Nous: Hermes 4 405B

[Nous Research](https://hanzo.ai/models/nousresearch)

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...

text

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## Specifications

Context Window

131K

Modalities

text

Input

$1.20 / M tokens

Output

$3.60 / M tokens

Status

available

Category

third-party

Model ID

nousresearch/hermes-4-405b

## Quick Start

TypeScript

```
import OpenAI from 'openai' const client = new OpenAI({ apiKey: process.env.HANZO_API_KEY, baseURL: 'https://api.hanzo.ai/v1' }) const response = await client.chat.completions.create({ model: 'nousresearch/hermes-4-405b', messages: [{ role: 'user', content: 'Hello!' }] }) console.log(response.choices[0].message.content)
```

Python

```
from openai import OpenAI client = OpenAI( api_key=os.environ["HANZO_API_KEY"], base_url="https://api.hanzo.ai/v1" ) response = client.chat.completions.create( model="nousresearch/hermes-4-405b", messages=[{"role": "user", "content": "Hello!"}] ) print(response.choices[0].message.content)
```

cURL

```
curl https://api.hanzo.ai/v1/chat/completions \ -H "Content-Type: application/json" \ -H "Authorization: Bearer $HANZO_API_KEY" \ -d '{ "model": "nousresearch/hermes-4-405b", "messages": [{"role": "user", "content": "Hello!"}] }'
```

Go

```
package main import ( "context" "fmt" "os" "github.com/sashabaranov/go-openai" ) func main() { cfg := openai.DefaultConfig(os.Getenv("HANZO_API_KEY")) cfg.BaseURL = "https://api.hanzo.ai/v1" client := openai.NewClientWithConfig(cfg) resp, _ := client.CreateChatCompletion(context.Background(), openai.ChatCompletionRequest{ Model: "nousresearch/hermes-4-405b", Messages: []openai.ChatCompletionMessage{ {Role: openai.ChatMessageRoleUser, Content: "Hello!"}, }, }, ) fmt.Println(resp.Choices[0].Message.Content) }
```

## More from Nous Research

[Nous: Hermes 3 405B Instruct131KHermes 3 is a generalist language model with many improvements over Hermes 2, including advanced agentic capabilities, much better roleplaying, reasoning, multi-turn conversation, long context coherence, and improvements across the...](https://hanzo.ai/models/nousresearch/hermes-3-llama-3.1-405b)[Nous: Hermes 3 70B Instruct131KHermes 3 is a generalist language model with many improvements over Hermes 2, including advanced agentic capabilities, much better roleplaying, reasoning, multi-turn conversation, long context coherence, and improvements across the...](https://hanzo.ai/models/nousresearch/hermes-3-llama-3.1-70b)[Nous: Hermes 4 70B131KHermes 4 70B is a hybrid reasoning model from Nous Research, built on Meta-Llama-3.1-70B. It introduces the same hybrid mode as the larger 405B release, allowing the model to either...](https://hanzo.ai/models/nousresearch/hermes-4-70b)

[View all Nous Research models →](https://hanzo.ai/models/nousresearch)

## Use Nous: Hermes 4 405B via Hanzo AI

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