Hermes 4 Models by Nous Research
2 models2025Up to 128k ctxFrom $0.05/1M input
Last refreshed 2026-04-23. Next refresh: weekly.
Details
ResearcherNous Research
LicenseLlama 3 Community
Commercial useCommercial use: conditional
Models2
Released2025
Max context128k
Capabilities
ReasoningAll models
Links
WebsiteAbout
The Hermes 4 family is Nous Research's open-source instruction-tuned series built on Llama 3.1 foundations, spanning 70B and 405B parameter variants with hybrid reasoning behavior and hosted availability through Nous Portal.
Decision facts
- Best fit
- reasoning
- Capability starting point
- Hermes-4-70B with 128k context and reasoning
- Lowest tracked input
- Hermes-4-70B · $0.05/1M · Nous Portal
- Closest related family
- MOSS-Audio
Current Variants
Use-when guidance is based on each model's tracked capabilities, context window, release date, and replacement status.
2 in view
Hermes-4-70BCurrent
Use when the workload needs 128k context, 70B parameters, and reasoning.
2025-09128k context70B parametersreasoning
Hermes-4-405BCurrent
Use when the workload needs 128k context, 405B parameters, and reasoning.
2025-09128k context405B parametersreasoning
| Model | Use when | Released | Signals | Status |
|---|---|---|---|---|
| Hermes-4-70B | Use when the workload needs 128k context, 70B parameters, and reasoning. | 2025-09 | 128k context70B parametersreasoning | Current |
| Hermes-4-405B | Use when the workload needs 128k context, 405B parameters, and reasoning. | 2025-09 | 128k context405B parametersreasoning | Current |
Release Timeline
1 release group2025-09
2 current
Hermes-4-405B
Current128k context405B parametersreasoning
Hermes-4-70B
Current128k context70B parametersreasoning
Specifications(2 models)
| Model | Released | Context | Parameters | Reasoning |
|---|---|---|---|---|
| Hermes-4-70B | 2025-09 | 128k | 70B | Yes |
| Hermes-4-405B | 2025-09 | 128k | 405B | Yes |
Available From(2 providers)
Pricing
| Model | Provider | Input / 1M | Output / 1M | Type |
|---|---|---|---|---|
| Hermes-4-70B | Nous Portal | $0.05 | $0.2 | Serverless |
| Hermes-4-405B | Nous Portal | $0.09 | $0.37 | Serverless |
| Hermes-4-70B | OpenRouter | $0.13 | $0.4 | Serverless |
| Hermes-4-405B | OpenRouter | $1 | $3 | Serverless |
