Nous Research: Hermes 4 Large
Hermes 4 Large is a language model from Nous Research released on Aug 26, 2025. It reads text and writes text, with a 128K token context window and up to 8K tokens per reply.
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It costs $0.30 per million input tokens and $1.20 per million output tokens. Cached input bills at $0.15, 50% less than fresh input.
It supports tool calling, structured JSON output and prompt caching, and its weights are open, so you can host it yourself.
4 providers serve it, including Nebius Token Factory, NanoGPT and Cortecs.
- Modalities
- In / out price
- $0.30 / $1.20 per 1M
- Context
- 128K
- Max output
- 8K
- Released
- Aug 26, 2025
- Knowledge cutoff
- Aug 2024
- Tool calling
- Structured output
- Reasoning
- Prompt caching
- Open weights
- Free to use
Hermes 4 Large pricing
USD, as listed on Oct 15, 2026. Most bills are input heavy, so the cached input rate matters as much as the headline price.
| Input | $0.30 / 1M tokens | |
|---|---|---|
| Output | $1.20 / 1M tokens | |
| Cached input (read) | $0.15 / 1M tokens | 50% off input |
Hermes 4 Large providers
4 providers serve it, including Nebius Token Factory, NanoGPT and Cortecs. Each host sets its own price and limits, so the cheapest one is not always the one with the longest context.
| Provider | Input /M | Output /M | Cache read /M | Context | Max output |
|---|---|---|---|---|---|
| Nebius Token Factory | $1 | $3 | $0.10 | 131K | 8K |
| NanoGPT | $0.30 | $1.20 | $0.15 | 128K | 8K |
| Cortecs | $0.996 | $2.99 | – | 128K | 128K |
| Kilo Gateway | $1 | $3 | – | 131K | 118K |
What Hermes 4 Large costs per month
Pick a workload close to yours or type your own volumes.
Supported request parameters
What you can set when you call Hermes 4 Large through an OpenAI compatible API.
- Tools
tools - Structured outputs
structured_outputs - Temperature
temperature
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Hermes 4 Large questions
How much does the Hermes 4 Large API cost?
$0.30 per million input tokens and $1.20 per million output tokens, with cached input at $0.15. The estimator on this page turns that into a monthly bill for your own workload.
What is the context window of Hermes 4 Large?
128,000 tokens of input, and it can write up to 8,192 tokens in one reply. As a rough guide, a million tokens is around 750,000 English words.
Which providers serve Hermes 4 Large?
4 providers serve it, including Nebius Token Factory, NanoGPT and Cortecs. Prices differ by host, so the Providers table on this page lists each one with its input and output price.
Does Hermes 4 Large support tool calling?
Yes. It accepts tool definitions and can return JSON that matches a schema, which is what an agent needs to call your APIs.
Is Hermes 4 Large open source?
Its weights are published, so you can run it on your own hardware or a cloud of your choice. Read the license before commercial use.
When was Hermes 4 Large released?
Aug 26, 2025, with training data up to Aug 2024.
Catalog data from models.dev (MIT licensed), refreshed daily, last on Oct 15, 2026. The summary is written from these facts.