Nous: Hermes 4 405B
Nous Hermes 4 405B, developed by nousresearch, is designed to process extensive text inputs up to 131,072 tokens long, making it suitable for detailed and lengthy analyses or document reviews. This model supports reasoning capabilities, allowing it to engage in more complex tasks that require deep understanding and logical inference. For users seeking a reliable tool with a blended benchmark score of 75.0 from one independent evaluation, Hermes 4 might be worth considering, especially if you are willing to invest $1.0 per million input tokens and $3.0 per million output tokens. While its performance is solid, the cost might be higher than some alternatives, making it a good choice for those prioritizing reasoning abilities over lower prices.
Benchmark results
Independent, published benchmarks. Blended score 75.0 across 1 benchmark, last refreshed 2026-08-13. How scoring works →
| Benchmark | Measures | Score |
|---|---|---|
| EQ-Bench | emotional understanding in dialogue | 65.2 |
- Model ID
- nousresearch/hermes-4-405b
- Vendor
- nousresearch
- Released
- August 2025
- Tokenizer
- Other
- Input Modalities
- text
- Output Modalities
- text
- Max Output
- default
- Tool Calling
- not supported
- Structured Output
- ✓ supported
- Reasoning Mode
- ✓ supported
- Vision
- text only
- Audio
- no
- Moderated
- no
What it costs in practice
Computed from the current $1.00/M input and $3.00/M output rates. Run your own numbers →
| Job | Tokens | Cost |
|---|---|---|
| Summarize a 50-page report | 30k in / 1.5k out | $0.03 |
| Classify 1,000 customer emails | 500k in / 50k out | $0.65 |
| A month of a busy support chatbot | 5M in / 2M out | $11.00 |
Similar models
Quick answers
- How much does Nous: Hermes 4 405B cost?
- $1.00 per million input tokens and $3.00 per million output tokens.
- What is Nous: Hermes 4 405B's context window?
- 131,072 tokens, roughly 196 pages of text in a single request.
- Does Nous: Hermes 4 405B support tool calling?
- It supports structured output, a reasoning mode.
- Can Nous: Hermes 4 405B process images?
- No, it is text-only on the input side.