KymaKyma
Nous Research

Nous Research

Hermes 3 405B

Nous Research's fine-tune of Llama 3.1 405B, tuned for steerability rather than refusal: it follows a system prompt further than the Instruct model it is built on, which is why roleplay, persona and agent-scaffold work keep reaching for it. Reliable function calling and structured output are part of the tune, not bolted on.

Modalities

Text → Text

Input

$1.35 /1M

Output

$1.35 /1M

Context

131K

Speed

medium

Pricing

Pay per token. Cached input is billed at 10% of the input rate.

$1.35 /1M input$1.35 /1M output
Hobby10 req/day · 2K in / 500 out
~$1.01/mo
Production1,000 req/day · 2K in / 500 out
~$101/mo
Scale20,000 req/day · 2K in / 500 out
~$2,025/mo
+ Estimate your workload
1,000
2,000
500

Estimated monthly cost

$101

$3.38 / day on Hermes 3 405B

Same workload on:

Hermes 3 70B$70.88-30%
Muse Spark 1.1$187+85%

Estimates use list pricing. Actual bills depend on real token counts — every response includes its exact cost.

How it compares

Against the peers people actually weigh it against.

SpecHermes 3 405BHermes 3 70BMuse Spark 1.1
Input /1M$1.35$0.945$1.688
Output /1M$1.35$0.945$5.738
Context131K131K1M
ToolsYesYesYes
ReasoningNoNoYes
Speedmediumfastmedium

Quick start

Up and running in under two minutes.

  1. 1

    Create an API key

    Sign up and grab a key from the dashboard — $0.50 free credit, no card required.

    Get API key →
  2. 2

    Make your first request

    Drop in your key and send a chat completion — fully OpenAI-compatible.

    curl https://kymaapi.com/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "hermes-3-405b",
    "messages": [
      {"role": "user", "content": "Explain prompt caching in one paragraph."}
    ]
  }'
  3. 3

    Stream responses

    Add "stream": true to receive tokens as they arrive.

    curl https://kymaapi.com/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "hermes-3-405b",
    "stream": true,
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

FAQ

Common questions about this model.

What is the context window of Hermes 3 405B?

Hermes 3 405B has a 131K-token context window — roughly 193 pages of text in a single request.

How much does the Hermes 3 405B API cost?

$1.35 per 1M input tokens and $1.35 per 1M output tokens. No subscription; you pay only for what you use.

Does Hermes 3 405B support function calling?

Yes — Hermes 3 405B supports tool/function calling and structured outputs (JSON mode), so it works with agent frameworks out of the box.

How do I use Hermes 3 405B?

Kyma is OpenAI-compatible: point your SDK's base URL at https://kymaapi.com/v1, use your Kyma API key, and set the model to hermes-3-405b. Signing up is free and includes $0.50 of credit — no card required.

Start with $0.50 free credit — no card required.Create account →

More models by Nous Research

ModelContextInputOutput
Nous ResearchHermes 3 70B131K$0.945$0.945