Hermes 3 405B
Hermes 3 405B by Nous Research is a full fine-tune of Llama-3.1 405B with steerable instruct behavior, a 131K context window, and native tool use.
Model Overview
Capabilities, design details, and architectural traits
Hermes 3 405B - Llama-3.1 405B fine-tune with steerable instruct behavior
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 |
Distinctive pattern
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.
Deployment note
The documented model card also positions it as a 405B variant in the Hermes 3 line with the same large 131K context window.
Benchmark Performance
Independent evaluations · Artificial Analysis
Accuracy & Capability Details
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| Model Details | |||
|---|---|---|---|
| General Info | |||
| Provider | Nous Research | Anthropic | Anthropic |
| Release Date | August 27, 2025 | September 22, 2026 | September 28, 2026 |
| Knowledge Cutoff | Dec 2023 | - | Jun 2026 |
| Context & Limits | |||
| Context Window | 131K | 1M Best Context Window | 1M Best Context Window |
| Pricing (per 1M tokens) | |||
| Input Pricing | $1 Best Input Pricing | $4 | $2 |
| Output Pricing | $3 Best Output Pricing | $20 | $10 |
| Modalities | |||
| Inputs | text | textimagefile | textimagefile |
| Outputs | text | text | text |
| Benchmarks (0-100) | |||
| Intelligence Index | 7.4 | 57.6 Best Intelligence Index | 56.0 |
| Coding Index | - | - | - |
| Agentic Index | - | - | - |
Humanity's Last Exam
Extremely difficult logical reasoning and knowledge.
Long Context Reasoning
Logical reasoning over long context windows.
SciCode Benchmark
Scientific coding and mathematical modeling.
Independent evaluation data provided by Artificial Analysis. To view the latest benchmarks and full details, visit their official site.
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