Hermes 4 – Llama-3.1 405B (Reasoning)
Analysis Summary
Hermes 4 on Llama-3.1 405B (Reasoning) is Nous Research's extended-thinking variant of its large fine-tune, and the benchmark uplift from enabling reasoning is clear. Its math index of 69.7, GPQA of 0.727, and LiveCodeBench of 0.686 all represent a meaningful step up from the non-reasoning sibling, and its MMLU-Pro of 0.829 is competitive in the mid-tier.
For businesses, this model suits tasks that benefit from deliberate, multi-step reasoning: complex analysis, technical writing, and coding assistance. Its agentic index remains limited, so it is not a strong fit for autonomous agent workflows, but it can handle harder single-turn tasks well. Pricing at $1/$3 per million tokens is moderate for a 405B reasoning model.
Teams needing a capable reasoning model for analytical or coding tasks, without moving to frontier pricing, will find this a practical option, particularly where the math and science benchmarks are relevant to the workload.
Assessed June 6, 2026
Editorial notes
Hermes 4 Llama-3.1 405B (Reasoning) from Nous Research shows strong math and GPQA scores with a LiveCodeBench of 0.686, making it a capable reasoning-mode option at $1/$3 per million tokens.
Rankings consider pricing, capabilities, benchmarks, and real-world applicability and are refreshed as new models launch. Feedback?
Performance Profile
How Hermes 4 – Llama-3.1 405B (Reasoning) compares
Hermes 4 – Llama-3.1 405B (Reasoning) ranks #188 of 378 AI models we track for overall intelligence, #170 of 315 for coding, #199 of 289 for agentic tasks. At $1.00 per million input tokens it is cheaper than 25% of comparable models.
Performance Indices
Source: Artificial Analysis
Benchmark Scores
Intelligence
Technical
Content
Benchmark data from Artificial Analysis and Hugging Face
How does Hermes 4 – Llama-3.1 405B (Reasoning) stack up?
Compare side-by-side with other professional models.
Model Information
| Provider | Nous Research |
| Release Date | August 27, 2025 |
| Status | Active |
Pricing
| Token Type | Cost per 1M tokens | Cost per 1K tokens |
|---|---|---|
| Input | $1.00 | $0.001000 |
| Output | $3.00 | $0.003000 |
Leaderboard Categories
Frequently asked questions about Hermes 4 – Llama-3.1 405B (Reasoning)
How much does Hermes 4 – Llama-3.1 405B (Reasoning) cost?
Hermes 4 – Llama-3.1 405B (Reasoning) costs $1.00 per million input tokens and $3.00 per million output tokens.
Is Hermes 4 – Llama-3.1 405B (Reasoning) good for coding?
On our coding benchmark index, Hermes 4 – Llama-3.1 405B (Reasoning) ranks #170 of 315 models, placing it in the broader range of the field for code generation and debugging.
Who created Hermes 4 – Llama-3.1 405B (Reasoning)?
Hermes 4 – Llama-3.1 405B (Reasoning) is developed by Nous Research and was released on August 27, 2025.
