Nous: Hermes 4 405B — pricing & benchmarks

By nousresearch · Updated 2026-10-06 · Open weights · llama3step-by-step reasoningopen weights / self-hostable

What Nous: Hermes 4 405B is used for

Nous: Hermes 4 405B is best suited for step-by-step reasoning, open weights / self-hostable. Access it through one Appmo API key alongside 458 other models — Appmo's optimizer can route to it automatically when it is the best value for a request. Weights: huggingface.co/NousResearch/Hermes-4-405B.

Use it via the Appmo API (OpenAI-compatible)

curl https://appmo.com/v1/chat/completions \
  -H "Authorization: Bearer $APPMO_KEY" \
  -d '{"model":"nousresearch/hermes-4-405b","messages":[{"role":"user","content":"Hello"}]}'

FAQ

How much does Nous: Hermes 4 405B cost?
Nous: Hermes 4 405B costs $1 per 1M input tokens and $3 per 1M output tokens ($1.5 blended), as of 2026-10-06. Prices are expected to fall as competition increases.

What is Nous: Hermes 4 405B best for?
Nous: Hermes 4 405B is best suited for step-by-step reasoning, open weights / self-hostable.

How do I use Nous: Hermes 4 405B?
Send requests to Appmo's OpenAI-compatible endpoint with model id "nousresearch/hermes-4-405b" and one API key — no separate provider account needed.

Is Nous: Hermes 4 405B open source?
Yes — its weights are public on Hugging Face (NousResearch/Hermes-4-405B) under the llama3 license; check the license terms before commercial use.

Can Nous: Hermes 4 405B create images?
No, Nous: Hermes 4 405B works with text.