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Nous: Hermes 4 405B

nousresearch chat
nousresearch/hermes-4-405b

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...

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At a glance

Model specifications

The most important technical and pricing details in one place.

Context window
131.1K tokens
Model type
Chat
Input / 1M
$1.00
Output / 1M
$3.00

Providers and routing order

Gateway-compatible routes are tried from the lowest cost; other sources are shown for catalog reference.

1 source
1
OpenRouterGateway activenousresearch/hermes-4-405b · Updated 05.10.2026 20:17
Input$1.0000 / 1M Output$3.0000 / 1M Cache$0.0000 / 1M Media-
Live telemetry

Usage and performance

Current request, token, and latency data across TamgaStudio.

Usage Example

Call Nous: Hermes 4 405B with a single request through the OpenAI-compatible TamgaStudio API. Create your API key from the API Keys section in your dashboard.

curl https://api.tamga.studio/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer tl-sk-XXXXXX" \
  -d '{"model": "nousresearch/hermes-4-405b", "messages": [{"role": "user", "content": "Hello!"}]}'
import requests

resp = requests.post(
    "https://api.tamga.studio/v1/chat/completions",
    headers={"Authorization": "Bearer tl-sk-XXXXXX"},
    json={
        "model": "nousresearch/hermes-4-405b",
        "messages": [{"role": "user", "content": "Hello!"}],
    },
)
print(resp.json()["choices"][0]["message"]["content"])
<?php
$ch = curl_init('https://api.tamga.studio/v1/chat/completions');
curl_setopt_array($ch, [
    CURLOPT_POST => true,
    CURLOPT_HTTPHEADER => [
        'Authorization: Bearer tl-sk-XXXXXX',
        'Content-Type: application/json',
    ],
    CURLOPT_POSTFIELDS => json_encode([
        'model' => 'nousresearch/hermes-4-405b',
        'messages' => [['role' => 'user', 'content' => 'Hello!']],
    ]),
    CURLOPT_RETURNTRANSFER => true,
]);
echo curl_exec($ch);

Frequently Asked Questions

Common questions about this model.

What is Nous: Hermes 4 405B?
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... It is accessible through a single OpenAI-compatible API via TamgaStudio.
How much does Nous: Hermes 4 405B cost?
Pricing is $1.00 per 1M input tokens and $3.00 per 1M output tokens. Billing is credit-based: you only pay for what you use.
What is the context length of Nous: Hermes 4 405B?
Nous: Hermes 4 405B supports a context of up to 131,072 tokens in one request.
Can I use Nous: Hermes 4 405B with the OpenAI SDK?
Yes. TamgaStudio exposes all models through an OpenAI-compatible endpoint: https://api.tamga.studio/v1/chat/completions. Just swap the base URL and API key in your existing OpenAI code.
How do I get an API key?
After signing in, create a key from the "API Keys" section of your dashboard. The key is shown only once and is stored as a SHA-256 hash.