Nous: Hermes 4 70B

nousresearch/hermes-4-70b

Created Aug 26, 2025131,072 context

$0.093/M input tokens$0.373/M output tokens

Hermes 4 70B is a hybrid reasoning model from Nous Research, built on Meta-Llama-3.1-70B. It introduces the same hybrid mode as the larger 405B release, allowing the model to either respond directly or generate explicit <think>...</think> reasoning traces before answering. Users can control the reasoning behaviour with the reasoning enabled boolean. Learn more in our docs

This 70B variant is trained with the expanded post-training corpus (~60B tokens) emphasizing verified reasoning data, leading to improvements in mathematics, coding, STEM, logic, and structured outputs while maintaining general assistant performance. It supports JSON mode, schema adherence, function calling, and tool use, and is designed for greater steerability with reduced refusal rates.

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Sample code and API for Hermes 4 70B

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OpenRouter provides an OpenAI-compatible completion API to 400+ models & providers that you can call directly, or using the OpenAI SDK. Additionally, some third-party SDKs are available.

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Using third-party SDKs

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See the Request docs for all possible fields, and Parameters for explanations of specific sampling parameters.

Hermes 4 70B - API, Providers, Stats | OpenRouter