# Hermes3 405B API Pricing

As of October 10, 2026, Hermes3 405B costs $0.80 per 1M input tokens and $0.80 per 1M output tokens on Lambda. It has a 131,072-token context window and returns up to 131,072 tokens per response.

- Page: https://models.litellm.ai/models/hermes3-405b
- LiteLLM model name: `lambda_ai/hermes3-405b`
- Context window: 131,072 tokens
- Max output: 131,072 tokens
- Added to LiteLLM: July 2025
- Prices updated: October 10, 2026

## Pricing by provider

Token prices in USD per 1M tokens.

| Provider | Model name | Input | Output | Cache read | Per image | Per second | Context |
|---|---|---|---|---|---|---|---|
| Lambda | `lambda_ai/hermes3-405b` | $0.80 | $0.80 | – | – | – | 128K |

## Cost examples

1,000 requests with 2,000 input and 500 output tokens each:

- Lambda: $2.00

100 long-document requests with 100,000 input and 2,000 output tokens each:

- Lambda: $8.16

## Features

Supported: Function calling, Parallel tool calls.

## Use it with LiteLLM

```python
from litellm import completion

response = completion(
    model="lambda_ai/hermes3-405b",
    messages=[{"role": "user", "content": "Hello!"}],
)
```

## FAQ

### How much does Hermes3 405B cost?

Hermes3 405B costs $0.80 per 1M input tokens and $0.80 per 1M output tokens on Lambda.

### What is the context window of Hermes3 405B?

Hermes3 405B has a 131,072-token context window and returns up to 131,072 tokens per response.

### Which providers offer Hermes3 405B?

Hermes3 405B is available from Lambda through LiteLLM, using the model name lambda_ai/hermes3-405b.

### How do I call Hermes3 405B with an OpenAI-compatible API?

Use the LiteLLM Python SDK with model="lambda_ai/hermes3-405b", or add the model to the LiteLLM proxy's config.yaml and send requests to /v1/chat/completions from any OpenAI client. LiteLLM tracks the cost of every request at the prices on this page.

### What features does Hermes3 405B support?

Hermes3 405B supports function calling and parallel tool calls.

### When did LiteLLM add Hermes3 405B?

Hermes3 405B was added to LiteLLM's model price file in July 2025.

Source: LiteLLM model price file, https://github.com/BerriAI/litellm/blob/main/model_prices_and_context_window.json