Nous: Hermes 4 70B

nousresearch/hermes-4-70b

Released Aug 26, 2025131,072 context

$0.13/M input tokens$0.40/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.

Providers for Hermes 4 70B

OpenRouter routes requests to the best providers that are able to handle your prompt size and parameters, with fallbacks to maximize uptime.

Performance for Hermes 4 70B

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Effective Pricing for Hermes 4 70B

Actual cost per million tokens across providers over the past hour

Apps using Hermes 4 70B

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Recent activity on Hermes 4 70B

Total usage per day on OpenRouter

Prompt

112M

Completion

4.41M

Reasoning

82K

Prompt tokens measure input size. Reasoning tokens show internal thinking before a response. Completion tokens reflect total output length.

Uptime stats for Hermes 4 70B

Uptime stats for Hermes 4 70B across all providers

Sample code and API for Hermes 4 70B

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OpenRouter provides an OpenAI-compatible completion API to 300+ 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 Pricing & Providers | OpenRouter