Explore the Versatile Nous: Hermes 4 405B

Harness hybrid reasoning with Nous: Hermes 4 405B for flexible text generation.

Input: text Output: text Context: 131,072 tokens Release: 2025-08-26

Discover Nous: Hermes 4 405B, a text-based model by Nous Research, launched in August 2025. Built on Meta-Llama-3.1-405B, it offers a unique hybrid reasoning mode, allowing users to balance between speed and depth in text generation. With a context window of 131072 tokens, it handles extensive inputs and outputs efficiently. The model is instruction-tuned with a focus on reasoning, enhancing its capabilities in math, code, STEM, and logical reasoning, while maintaining broad utility as an assistant. It supports structured outputs and is designed for steerability, ensuring user-directed interactions.

Use Cases

Here are a few ways teams apply Nous: Hermes 4 405B in practice—from fast drafting to multimodal understanding. Adapt these ideas to your workflow.

Enhance logical reasoning in text tasks

Generate structured outputs for precise needs

Balance speed and depth in text interactions

Optimize math and STEM problem-solving

Facilitate user-directed conversational AI

Key Features

A quick look at the capabilities that make this model useful in real projects.

Hybrid reasoning mode for flexible responses

131072 token context window

Instruction-tuned for enhanced reasoning

Supports structured outputs like JSON

Steerable for user-directed behavior

Specs

Overview

Vendor
nousresearch

Model ID
nousresearch/hermes-4-405b

Release
2025-08-26

Modalities & context

Input
text

Output
text

Context
131,072 tokens

Parameters & defaults

Supported parameters: frequency_penalty, include_reasoning, max_tokens, presence_penalty, reasoning, repetition_penalty, response_format, seed, stop, structured_outputs, temperature, tool_choice, tools, top_k, top_p

Defaults: temperature 0.2, top_p 0.95

Benchmark tests: Nous: Hermes 4 405B

We ran this model against a few representative prompts to show its range. Review the outputs below and be the judge.

Text

Prompt:

Write 150 words on how AI might positively upend work, leisure and creativity

Artificial intelligence has the potential to revolutionize work, leisure, and creativity in myriad positive ways. In the realm of work, AI can automate mundane tasks, freeing up human employees to focus on more complex, creative, and fulfilling aspects of their jobs. This shift could lead to increased job satisfaction and productivity. In terms of leisure, AI-powered personal assistants could help individuals better manage their time, allowing for more opportunities to pursue hobbies and interests. Furthermore, AI-driven recommendation systems could expose people to new forms of entertainment and experiences tailored to their preferences. When it comes to creativity, AI tools can serve as powerful collaborators, providing inspiration, generating ideas, and even producing original works of art, music, and literature. By augmenting human creativity, AI has the potential to push the boundaries of what is possible and usher in a new era of artistic expression and innovation.

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up.end

/ˌəpˈend/

verb

To “upend” means to completely disrupt, overturn, or drastically change the established order or structure of something. It implies a significant shift or alteration that can potentially have far-reaching consequences. When something is upended, it is turned upside down or transformed in a way that challenges conventional norms or expectations. The term often carries a sense of innovation, transformation, and sometimes even a hint of upheaval, indicating that the changes are not just minor adjustments but rather a fundamental reimagining of the status quo.

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