Nous: Hermes 4 405B
Analysis Summary
Nous Research's Hermes 4 405B is a large text model with a 131K context window. Its scale may appeal to teams seeking a capable open-model option, but the supplied record contains no reasoning, coding, instruction-following, or agentic benchmarks to support that assumption.
There is also no stated tool or function-calling capability, which limits confidence for automated client workflows. The listed pricing is materially higher than budget alternatives, so experimentation should be task-specific and measured against models with established results. It may be worth testing for demanding text generation or self-hosting-oriented strategies, but it is not a first-choice production model on the available evidence.
Assessed August 9, 2026
Editorial notes
Hermes 4 405B provides a 131K context window and substantially more capacity than the smaller variant, but benchmark data and tool capabilities are absent, while pricing is high for unverified production use.
Rankings consider pricing, capabilities, benchmarks, and real-world applicability and are refreshed as new models launch. Feedback?
DFO Verdict
Hermes 4 405B provides a 131K context window and substantially more capacity than the smaller variant, but benchmark data and tool capabilities are absent, while pricing is high for unverified production use.
How Nous: Hermes 4 405B compares
Its 131K-token context window is larger than 51% of the models we list. At $1.00 per million input tokens it is cheaper than 28% of comparable models.
Dark bar = input · light bar = output, scaled to the priciest peer.
1M tokens ≈ 8 full-length novels or ~2,500 pages of business documents in a single request.
Strongest on value. The pulled-in technical corner is the trade-off, and if the shape matters more than the price, this is your model.
Compare shapes side-by-side →Pricing
| Token Type | Cost per 1M tokens | Cost per 1K tokens |
|---|---|---|
| Input | $1.00 | $0.001000 |
| Output | $3.00 | $0.003000 |
What would Nous: Hermes 4 405B cost your business?
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A website chatbot handling around 100 customer conversations a day, a few short messages each.
Full calculator with 688 models → Price Calculator
These numbers get smaller with the right architecture.
We route routine calls to cheap models and save Nous: Hermes 4 405B for the hard ones. Most clients cut their estimate by 60-80%.
Talk to our teamAbout 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..
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.
