Nous: Hermes 4 405B
Nous: Hermes 4 405B is an AI model designed for handling text-based tasks with a maximum context length of 131,072 tokens and robust reasoning capabilities. It supports text input only and excels in complex problem-solving but does not offer structured output or integration with external tools. This model stands as a solid choice for users requiring high-level reasoning skills on text inputs, given its benchmark blended score of 75.0 across one independent benchmark. While it may be more expensive at $1.0 per million input tokens and $3.0 per million output tokens, its performance justifies the cost for those prioritizing robust reasoning over structured data outputs or tool integration.
Benchmark results
Independent, published benchmarks. Blended score 75.0 across 1 benchmark, last refreshed 2026-07-29. 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 |
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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.