Hermes 4 405B
Instantly via the EU router or as a dedicated GPU deployment. Data stays in Europe.
$ curl https://hostyourai.com/api/v1/chat/completions \
-H "Authorization: Bearer hyai-..." \
-H "Content-Type: application/json" \
-d '{
"model": "NousResearch/Hermes-4-405B",
"messages": [{"role": "user", "content": "Hello!"}]
}'
Call it now
Drop-in replacement for OpenAI: change only the base URL and API key. The Anthropic format (/v1/messages) is supported too.
text->text · NousResearch · sovereign EU
Runs on EU infrastructure operated by European companies, from your request to the GPU. See the full chain
Hermes 4 405B is an open-source language model from NousResearch with a 131K-token context window, hosted on EU GPUs via an OpenAI-compatible API.
- Router
- Router · warm
- Dedicated
- Dedicated · on request
- Input (per 1M tokens)
- €1.15
- Output (per 1M tokens)
- €3.45
Specifications
| Context window | 131,072 tokens |
|---|---|
| Modality | text->text |
| Publisher | NousResearch ↗ |
Pricing
Shared router · per token
Dedicated GPU · per hour
Shared EU router, you pay only per token. Dedicated GPU deployments are billed per minute, see pricing.
Bench index
Bench is our quality index for every model, 0 to 100. It rests on public measurements (Epoch AI with about 40 benchmarks, LiveBench, LMArena and more) and is refreshed every morning. Where nobody measures, it shows an estimate with a range.
No public benchmark yet: estimated from size and release date.
Range 67.3 to 90.2
Sources: Epoch AI ↗ · LiveBench ↗ · LMArena ↗ · Refreshed daily, last on 09-11-2026
Frequently asked questions
Can I run Hermes 4 405B in the EU?
Yes. HostYourAI runs Hermes 4 405B on GPUs in European datacenters via vLLM. Prompts and outputs never leave the EU and there is no US cloud provider in the chain.
Is hosting Hermes 4 405B GDPR-compliant?
Yes. All processing happens inside the EU, a Data Processing Agreement (DPA) is available and the subprocessor list is public. Open-source weights also mean: no training on your data.
How much does Hermes 4 405B cost?
Via the shared EU router you pay €1.15 per million input tokens and €3.45 per million output tokens, with no fixed costs. For high volume or isolation you can also run Hermes 4 405B on a dedicated GPU instance, billed per minute.
Is the API OpenAI-compatible?
Yes. You use the standard OpenAI SDKs with a custom base URL (https://hostyourai.com/api/v1). The Anthropic Messages API is supported as a drop-in as well.
One platform, four layers
Start with one layer and add the others when the work asks for it. They share one key, one balance and one Activity view.
Try Hermes 4 405B for free
Creating an account takes a minute. Test Hermes 4 405B straight away in the playground.
