Nous: DeepHermes 3 Mistral 24B Preview

by Nous

DeepHermes 3 (Mistral 24B Preview) is an instruction-tuned language model by Nous Research based on Mistral-Small-24B, designed for chat, function calling, and advanced multi-turn reasoning. It introduces a dual-mode system that toggles between intuitive chat responses and structured “deep reasoning” mode using special system prompts. Fine-tuned via distillation from R1, it supports structured output (JSON mode) and function call syntax for agent-based applications. DeepHermes 3 supports a **reasoning toggle via system prompt**, allowing users to switch between fast, intuitive responses and deliberate, multi-step reasoning. When activated with the following specific system instruction, the model enters a *"deep thinking"* mode—generating extended chains of thought wrapped in `<think></think>` tags before delivering a final answer. System Prompt: You are a deep thinking AI, you may use extremely long chains of thought to deeply consider the problem and deliberate with yourself via systematic reasoning processes to help come to a correct solution prior to answering. You should enclose your thoughts and internal monologue inside <think> </think> tags, and then provide your solution or response to the problem.

Avg Score

0.0%

0 answers

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0ms

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Pricing

$0.02

input

$0.10

output

per 1M tokens

Context

33K

tokens

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Other Models from Nous

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Model	Score	Latency	Cost/1M
Nous: Hermes 4 70B	—	—	$0.24
Nous: Hermes 4 405B	—	—	$2.00
Nous: Hermes 3 70B Instruct	—	—	$0.30
Nous: Hermes 3 405B Instruct	—	—	$0.0000
Nous: Hermes 3 405B Instruct	—	—	$1.00
NousResearch: Hermes 2 Pro - Llama-3 8B	—	—	$0.05

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Quickstart

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View on OpenRouter

import { OpenRouter } from "@openrouter/sdk";

const openrouter = new OpenRouter({
  apiKey: "<OPENROUTER_API_KEY>"
});

const completion = await openrouter.chat.completions.create({
  model: "nousresearch/deephermes-3-mistral-24b-preview",
  messages: [
    {
      role: "user",
      content: "Hello!"
    }
  ]
});

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

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