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Nous Research

Hermes 4 405B

nousresearch/hermes-4-405b

Hermes 4 is a large-scale reasoning model built on Meta-Llama-3.1-405B and released by Nous Research.

$1.10 in · $3.30 out per 1M tokens131k contextAug 26, 2025

about 0.2¢ a message

A typical message: about 500 tokens you send and 500 it writes.

Chat with Hermes 4 405B
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Spec sheet

Published facts from the catalog, billed prices and what we measured here. Anything not measured says so.

Price, billed here

Input, per 1M tokens
$1.10provider $1.00
Output, per 1M tokens
$3.30provider $3.00
Cached input, per 1M
$0.22provider $0.20
Margin
+10%

Context and formats

Context window
131,072 tokens
Longest answer
117,964 tokens
Reads
text
Makes
text
First listed
2025-08-26

Measured here, last 7 days

First token, median
not measured
Answered without error
not measured

Tools and JSON

Tool calling
not declared
JSON output
declaredthe provider's claim, not yet measured here

Price and latency history as JSON: GET /api/planet/history?id=nousresearch/hermes-4-405b.

About

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...

In Nous Research's words.

Try it here

The answer appears here.

Measured here

Call it

Use one OpenAI compatible endpoint, this model's id and an am_live_ key from the dashboard. You can also try it in chat first with no key.

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

Everything else is in the docs.

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