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Nous: nousresearch/hermes-4-405b
nousresearch/hermes-4-405b
131.1K context118.0K outReasoning
Released Aug 26, 2025Updated Nov 5, 2026
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...
Inputs used for the providers' own purposes
At least one provider of this model uses your inputs for its own purposes, for example to train AI models. Do not enter personal data of third parties or sensitive data. You can object to this use at any time in your account settings or via "Manage consents" in the chat.
Read the privacy policyPricing
Input price
$1.00/ 1M tokens
Output price
$3.00/ 1M tokens
Compatible endpoints openaiVendor NousProvider Routerah
Uptime
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Supported parameters
All providers = every upstream serving this model supports it. Some providers = depends on which upstream handles the request. Default = the value sent when you leave the parameter unset.
| Parameter | Providers | Default |
|---|---|---|
| frequency_penalty | Some providers | - |
| include_reasoning | Some providers | - |
| logit_bias | Some providers | - |
| logprobs | Some providers | - |
| max_tokens | Some providers | - |
| presence_penalty | Some providers | - |
| reasoning | Some providers | - |
| repetition_penalty | Some providers | - |
| response_format | Some providers | - |
| seed | Some providers | - |
| stop | Some providers | - |
| structured_outputs | Some providers | - |
| temperature | Some providers | - |
| top_k | Some providers | - |
| top_logprobs | Some providers | - |
| top_p | Some providers | - |