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 <think>...</think> traces or respond direc…
Model details →Nous: Hermes 4 405B vs Perplexity: Sonar Deep Research
Nous: Hermes 4 405B wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
Sonar Deep Research is a research-focused model designed for multi-step retrieval, synthesis, and reasoning across complex topics. It autonomously searches, reads, and evaluates sources, refining its approach as it gathers information. This…
Model details →Side-by-side comparison
| Capability | Nous: Hermes 4 405B | Perplexity: Sonar Deep Research | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 131K | 128K | 🏆 Nous: Hermes 4 405B |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $1.00 | $2.00 | 🏆 Nous: Hermes 4 405B |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $3.00 | $8.00 | 🏆 Nous: Hermes 4 405B |
| Tool / function calling First-class support for emitting structured tool calls. | — | — | Tie |
| Vision input Accepts image inputs alongside text. | — | — | Tie |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is Nous: Hermes 4 405B better than Perplexity: Sonar Deep Research?
Nous: Hermes 4 405B wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between Nous: Hermes 4 405B and Perplexity: Sonar Deep Research?
Input: $1.00 vs $2.00 per 1M tokens. Output: $3.00 vs $8.00 per 1M tokens.
What context windows do Nous: Hermes 4 405B and Perplexity: Sonar Deep Research support?
Nous: Hermes 4 405B supports up to 131K tokens. Perplexity: Sonar Deep Research supports up to 128K tokens.
Do both Nous: Hermes 4 405B and Perplexity: Sonar Deep Research support tool calling?
Nous: Hermes 4 405B: not advertised. Perplexity: Sonar Deep Research: not advertised.