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Nous: Hermes 3 405B Instruct

Open Weights

DEVELOPED BY: Nous • LAST UPDATED: 9/1/2026

Compare Model
CCI (Capability)51.4Consensus: N/A
Context Window131,072Max token length
In/Out Pricing$1/$1Blended cost/1M: $1.00
Pulse (Popularity)16/100Adoption + discussion proxy

Model Description

OpenRouter model gateway for Nous: Hermes 3 405B Instruct.

Domain Averages

Reasoning55.8%
Coding50.2%
Math29.1%
Preference70.6%

Jury & Benchmark Signals

Source / HarnessScore
GPQA-Diamond51%
Humanity's Last Exam48%
MMLU-Pro83%
SWE-bench Verified35%
LiveCodeBench42%
AIME35%
LMArena style-controlled Elo1240

Supported Modalities

INPUT:
text
OUTPUT:
text

Search Tags

#text#open-weight#reasoning

How to Use This Model

Python SDK Integration:
import openai

client = openai.OpenAI(
  base_url="https://openrouter.ai/api/v1",
  api_key="YOUR_OPENROUTER_KEY"
)

response = client.chat.completions.create(
  model="nousresearch/hermes-3-llama-3.1-405b",
  messages=[
    {"role": "user", "content": "Explain quantum entanglement in 1 sentence."}
  ]
)
cURL Terminal Request:
curl https://openrouter.ai/api/v1/chat/completions \
  -H "Authorization: Bearer $OPENROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "nousresearch/hermes-3-llama-3.1-405b",
    "messages": [
      {"role": "user", "content": "Hello!"}
    ]
  }'

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