Hermes 3 405B Instruct (free)
Nous Hermes 3 405B Instruct (free) — pricing, 131k context window, API cost calculator and alternatives.
By Nous
Specs
- Provider
- Nous
- Slug
- nousresearch/hermes-3-llama-3-1-405b-free
- Capabilities
- text-only
Pricing freshness
- Tier
- standard
- Currency
- USD
- As of
- 2026-05-08 17:08 UTC
Pricing history
Tracking Hermes 3 405B Instruct (free) pricing since 2026-05-08. We'll plot the chart here once it changes.
Quickstart — call Hermes 3 405B Instruct (free) from your app
curl https://openrouter.ai/api/v1/chat/completions \
-H "Content-Type: application/json" \
-H "Authorization: Bearer $OPENROUTER_API_KEY" \
-d '{
"model": "nousresearch/hermes-3-llama-3-1-405b-free",
"messages": [{"role": "user", "content": "Hello!"}]
}'Official docs: https://openrouter.ai/docs
# pip install openai
from openai import OpenAI
client = OpenAI(
base_url="https://openrouter.ai/api/v1",
api_key=os.environ["OPENROUTER_API_KEY"],
)
resp = client.chat.completions.create(
model="nousresearch/hermes-3-llama-3-1-405b-free",
messages=[{"role": "user", "content": "Hello!"}],
)
print(resp.choices[0].message.content)Official docs: https://openrouter.ai/docs
// npm install openai
import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://openrouter.ai/api/v1",
apiKey: process.env.OPENROUTER_API_KEY,
});
const resp = await client.chat.completions.create({
model: "nousresearch/hermes-3-llama-3-1-405b-free",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(resp.choices[0].message.content);Official docs: https://openrouter.ai/docs
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Frequently asked questions
What is Hermes 3 405B Instruct (free)?
Hermes 3 405B Instruct (free) is a large language model API from Nous with a 131k-token context window. It costs $0 per 1M input tokens and $0 per 1M output tokens.
How much does Hermes 3 405B Instruct (free) cost?
Hermes 3 405B Instruct (free) is priced at $0 per 1M input tokens and $0 per 1M output tokens via the Nous API. A 50/50 input/output workload of 1M total tokens costs about $0.
What is the context window of Hermes 3 405B Instruct (free)?
Hermes 3 405B Instruct (free) supports up to 131k tokens of context per request — roughly 262 pages of English text or 16384 lines of code at a typical density.
Does Hermes 3 405B Instruct (free) support vision, tool use, or JSON mode?
Hermes 3 405B Instruct (free) is a text-only model — it does not support vision, tool use, or structured JSON mode.
Who makes Hermes 3 405B Instruct (free)?
Hermes 3 405B Instruct (free) is built and operated by Nous. Pricing, context window, and capabilities on this page are refreshed nightly from Nous's public catalog.
Can I self-host Hermes 3 405B Instruct (free)?
Hermes 3 405B Instruct (free) is API-only — its weights are not publicly distributed by Nous, so it cannot be self-hosted today.