Hermes 4 405B

hermes Reasoning Tool Calling Open Weights Structured Output

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...

Providers 2

Released Aug 25, 2025

Input Modalities text

Output Modalities text

Tarsk Use coding

Available Providers (2)

Provider	Model ID	Input Cost	Output Cost	Context	Max Output	Docs
OpenRouter	`nousresearch/hermes-4-405b`	$1.00/MTok	$3.00/MTok	131.1K	131.1K
Nebius Token Factory	`NousResearch/Hermes-4-405B`	$1.00/MTok	$3.00/MTok	128K	8.2K

Capabilities

Reasoning

Tool Calling

Attachments

Open Weights

Structured Output