Hermes 4 405B
by NousReleased Aug 26, 2025
nousresearch/hermes-4-405b- Answers in a JSON schema
- Reasons before it answers
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...
- Input / 1M tokens
- $1.20
- Output / 1M tokens
- $3.60
- Context
- 131K
- Longest answer
- 118K
What it costs
What each call is charged to the token's AI credit.
| Billed for | You pay |
|---|---|
| Input tokens | $1.20 / 1M |
| Output tokens | $3.60 / 1M |
A typical call
A short chat turn: 2,000 tokens in, 500 out.
- per call
- $0.0042
- calls per $20
- 4,761
What it can do
From its listing. The router passes every field through.
- Reads imagesNo
- Reads files and PDFsNo
- Hears audioNo
- Calls toolsNo
- Answers in a JSON schemaYes
- Reasons before it answersYes
- Searches the webNo
- Caches long promptsNo
- Draws imagesNo
Call it
Any router key works, in the format your SDK already speaks.
import OpenAI from "openai";const ai = new OpenAI({ baseURL: "https://relayfor.si/api/v1", apiKey: process.env.RELAYFOR_ROUTER_KEY,});const reply = await ai.chat.completions.create({ model: "nousresearch/hermes-4-405b", messages: [{ role: "user", content: "Welcome the 1,000th holder in one line." }],});Specifications
What its maker and providers list for it.
- Reads
- Text
- Writes
- Text
- Context
- 131,072 tokens
- Longest answer
- 117,964 tokens
- Intelligence index
- 7.5 (#189 of 220 rated)
- Knowledge cutoff
- Aug 31, 2024
- Released
- Aug 26, 2025
- Moderation
- None
Request fields
The fields its providers accept, passed through as you send them.
- frequency_penalty
- include_reasoning
- max_tokens
- presence_penalty
- reasoning
- repetition_penalty
- response_format
- temperature
- top_k
- top_p
Questions
How much does Hermes 4 405B cost?
$1.20 per million input tokens and $3.60 per million output tokens, paid from the token's AI credit. A call of 2,000 tokens in and 500 out costs about $0.0042.
How do I call Hermes 4 405B?
Make a router key for one of your tokens on the dashboard, point any OpenAI or Anthropic SDK at https://relayfor.si/api/v1 and send the model id nousresearch/hermes-4-405b. The token's AI credit pays for each call.
How long a prompt can Hermes 4 405B take?
Up to 131,072 tokens of context, and up to 117,964 tokens in one answer.
Are my prompts stored?
No. The RFS Router passes each call through and keeps only its token counts and cost, for the token's usage page.
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