Nous: Hermes 4 405B
Analysis Summary
Hermes 4 405B is Nous Research's large 405-billion parameter model with a 131K context window. No benchmark data has been published, and the model does not list tool use or function calling support, which is a significant limitation for business workflows requiring structured outputs or agent orchestration.
At $1/1M input and $3/1M output, the pricing is in the mid-to-high range for a model with no published performance evidence. Without benchmarks, there is no basis for recommending it over well-established alternatives at similar or lower price points.
Until independent benchmark results are available, this model cannot be recommended for business adoption. Teams requiring large-parameter models for complex reasoning or content tasks should prioritise models with published benchmark data to ensure predictable performance.
Assessed June 6, 2026
Editorial notes
Nous Hermes 4 405B has no benchmark data and no tool use or function calling listed; at $1/1M input, capability cannot be justified without performance evidence.
Rankings consider pricing, capabilities, benchmarks, and real-world applicability and are refreshed as new models launch. Feedback?
Performance Profile
How Nous: Hermes 4 405B compares
Its 131K-token context window is larger than 59% of the models we list. At $1.00 per million input tokens it is cheaper than 25% of comparable models.
About Nous: Hermes 4 405B
Hermes 4 is a large-scale reasoning model built on Meta-Llama-3.1-405B and released by Nous Research. It introduces a hybrid reasoning mode, where the model can choose to deliberate internally with..
How does Nous: Hermes 4 405B stack up?
Compare side-by-side with other legacy models.
Model Information
| OpenRouter ID |
nousresearch/hermes-4-405b
|
| Provider | nousresearch |
| Release Date | August 26, 2025 |
| Context Length | 131,072 tokens |
| Status | Active |
Pricing
| Token Type | Cost per 1M tokens | Cost per 1K tokens |
|---|---|---|
| Input | $1.00 | $0.001000 |
| Output | $3.00 | $0.003000 |
Live Performance
Live endpoint metrics, refreshed every 30 minutes.
External Resources
Frequently asked questions about Nous: Hermes 4 405B
How much does Nous: Hermes 4 405B cost?
Nous: Hermes 4 405B costs $1.00 per million input tokens and $3.00 per million output tokens.
What is the context window of Nous: Hermes 4 405B?
Nous: Hermes 4 405B has a context window of 131,072 tokens (131K).
Who created Nous: Hermes 4 405B?
Nous: Hermes 4 405B is developed by Nous and was released on August 26, 2025.
