Hermes 3 405B by NousResearch is a full fine-tune of Llama-3.1 405B with steerable instruct behavior, 131K context, and native tool use.
Capabilities, design details, and architectural traits
Hermes 3 405B is NousResearch's full-parameter fine-tune of Llama-3.1 405B. It is built as an instruct-tuned model with strong steering for roleplay, reasoning, and multi-turn conversation.
| Trait | Documented identity |
|---|---|
| Base model | Full-parameter fine-tune of Llama-3.1 405B |
| Instruction style | Instruct-tuned and focused on user alignment |
| Documented use pattern | Advanced roleplaying, reasoning, multi-turn conversation, and code generation |
| Context window | 131K tokens |
| Output pattern | Text generation model |
The model is presented as a generalist instruct model rather than a specialist task model. Its identity is defined by steerability and broad conversational control.
The documented model card also positions it as a 405B variant in the Hermes 3 line with the same large 131K context window.
Independent evaluations · Artificial Analysis
Evaluate specifications, pricing, and independent benchmark indices
| Model Details | |||
|---|---|---|---|
| General Info | |||
| Provider | Nous Research | Anthropic | Anthropic |
| Release Date | August 27, 2025 | July 24, 2026 | June 9, 2026 |
| Knowledge Cutoff | Dec 2023 | May 2026 | - |
| Context & Limits | |||
| Context Window | 131K | 1M Best Context Window | 1M Best Context Window |
| Pricing (per 1M tokens) | |||
| Input Pricing | $1 Best Input Pricing | $5 | $10 |
| Output Pricing | $3 Best Output Pricing | $25 | $50 |
| Modalities | |||
| Inputs | text | textimage | textimagefile |
| Outputs | text | text | text |
| Benchmarks (0-100) | |||
| Intelligence Index | 8.6 | 63.1 Best Intelligence Index | 62.1 |
| Coding Index | - | 78.0 Best Coding Index | 76.5 |
| Agentic Index | - | 59.2 Best Agentic Index | 56.6 |
Graduate-level reasoning and expert Q&A evaluation.
Extremely difficult logical reasoning and knowledge.
Logical reasoning over long context windows.
Independent evaluation data provided by Artificial Analysis. To view the latest benchmarks and full details, visit their official site.
