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Nous: Hermes 4 405B

Nousresearch · nousresearch/hermes-4-405b

Runs in the cloud, on our API — not on your own machine.

open weights reasoning optional

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...

Install on 00

Get the 00 app

Free · macOS

Your agents, your models, your machine — this model installs with one click once the app is on board.

Download free →

What it costs

Input / 1M
$2
Output / 1M
$6
1M in + 1M out
$8

Final AI-token prices, per million tokens. Bring your own provider key in the app to pay provider rates directly.

What it can do

Takes
text
Returns
text
Tools
no
Reasoning
optional
Context window
131K tokens
Max output
118K tokens
Open weights
yes

Dates

Released
2025-08-26
Knowledge cutoff
2024-08-31
Retires
—

Using it

In the 00 app — pick it per agent, and per tier, then build your own agents on it. Get 00.

As a drop-in API — the same model at an OpenAI-compatible endpoint. Two settings:

  1. Create a workspace API key in the Overblast console — usage bills that workspace's AI tokens, at the prices on this page.
  2. Point your base URL at https://brain.deployd.network/ai/v1. Chat completions with streaming, embeddings, /images, /audio/transcriptions and /videos.
curl https://brain.deployd.network/ai/v1/chat/completions \
  -H "Authorization: Bearer ob_live_YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "nousresearch/hermes-4-405b",
    "messages": [{ "role": "user", "content": "Hello" }]
  }'

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