Hermes 4 405B

About Hermes 4 405B

Hermes 4 is Nous Research's latest flagship fine-tune, combining cutting-edge base models with specialized instruction tuning. The model excels at following complex instructions, roleplay, and creative tasks while maintaining strong reasoning capability. Hermes 4 demonstrates particularly good performance on nuanced conversations and tasks requiring careful instruction following. Available in 70B and 405B parameter versions for different capability requirements. For developers seeking the most capable open-source model with enhanced instruction following, Hermes 4 offers frontier-level performance with community-driven improvements.

Model Specifications

💰 Real-World Cost Examples

Estimated monthly costs for common use cases

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🚀 Quick Start

Get started with Hermes 4 405B API

from openai import OpenAI

client = OpenAI(
    base_url="https://api.provider.com/v1",
    api_key="YOUR_API_KEY"
)

response = client.chat.completions.create(
    model="nousresearch/hermes-4-405b",
    messages=[
        {"role": "user", "content": "Hello!"}
    ]
)
print(response.choices[0].message.content)

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