nousresearch/hermes-4-405bThe quickest way is through an API gateway such as OpenRouter, which uses the same format as the OpenAI API. Create a key, then send a request with the model ID nousresearch/hermes-4-405b:
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Hermes 3 is a generalist language model with many improvements over [Hermes 2](/models/nousresearch/nous-hermes-2-mistral-7b-dpo), including advanced agentic capabilities, much better roleplaying, reasoning, multi-turn conversation, long context coherence, and improvements across the...
Hermes 3 is a generalist language model with many improvements over Hermes 2, including advanced agentic capabilities, much better roleplaying, reasoning, multi-turn conversation, long context coherence, and improvements across the...
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...
Hermes 4 405B can read up to 131,072 tokens in one request, roughly 98,304 words.
Through OpenRouter, Hermes 4 405B costs about $1.00 / 1M tokens for input and $3.00 / 1M tokens for output. Prices change, so check before large jobs.
Hermes 4 405B has open weights, so you can download and run it yourself, subject to its licence.
Hermes 4 405B accepts text and produces text.
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Specs and prices come from OpenRouter and the provider, and are refreshed daily. Last checked 26 Aug 2025.