hermes-4-405b

completions

byopenrouter

hermes-4-405b

completions

Published by: nousresearchProvider:

openrouter

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 <think>...</think> traces or respond directly, offering flexibility between speed and depth. Users can control the reasoning behaviour with the `reasoning` `enabled` boolean. [Learn more in our docs](https://openrouter.ai/docs/use-cases/reasoning-tokens#enable-reasoning-with-default-config) The model is instruction-tuned with an expanded post-training corpus (~60B tokens) emphasizing reasoning traces, improving performance in math, code, STEM, and logical reasoning, while retaining broad assistant utility. It also supports structured outputs, including JSON mode, schema adherence, function calling, and tool use. Hermes 4 is trained for steerability, lower refusal rates, and alignment toward neutral, user-directed behavior.

Context

131072

Input

$0.6 / 1M tokens

Output

$1.9 / 1M tokens

Capabilities: tools

Accepts: text

Returns: text

Context: 131072 Input: $0.6 / 1M tokensOutput: $1.9 / 1M tokensCapabilities: toolsAccepts: textReturns: text

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Code Examples

Integration samples and API usage

Code Samples for hermes-4-405b

Python SDK Example:

from openai import OpenAI

client = OpenAI(
    base_url="https://api.us-east-1.langdb.ai/projects/<your_project_id>",
    api_key="<your_api_key>"
)

response = client.chat.completions.create(
    model="hermes-4-405b",
    messages=[
        {"role": "user", "content": "Hello, how are you?"}
    ]
)

print(response.choices[0].message.content)

TypeScript SDK Example:

import OpenAI from 'openai';

const client = new OpenAI({
    baseURL: "https://api.us-east-1.langdb.ai/projects/<your_project_id>",
    apiKey: "<your_api_key>"
});

const response = await client.chat.completions.create({
    model: "hermes-4-405b",
    messages: [
        { role: "user", content: "Hello, how are you?" }
    ]
});

console.log(response.choices[0].message.content);

cURL Example:

curl -X POST "https://api.us-east-1.langdb.ai/projects/<your_project_id>/v1/chat/completions" \
  -H "Authorization: Bearer <your_api_key>" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "hermes-4-405b",
    "messages": [
        {"role": "user", "content": "Hello, how are you?"}
    ]
  }'

Model: hermes-4-405b

Provider: openrouter

API Endpoint: $https://api.us-east-1.langdb.ai

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hermes-4-405b by openrouter - AI Model Details, Pricing, and Performance Metrics

hermes-4-405b

hermes-4-405b

Access hermes-4-405b through LangDB AI Gateway

Code Examples

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