Perplexity’s Sonar Reasoning Pro is a reasoning model with 128K context, enhanced Chain-of-Thought, real-time web retrieval, and no customer-data training.
Capabilities, design details, and architectural traits
Sonar Reasoning Pro is Perplexity’s advanced reasoning model for complex multi-step problem solving. Perplexity describes it as a high-performance reasoning model with enhanced information retrieval and Chain-of-Thought reasoning.
Perplexity says the model is built for complex problem-solving that combines advanced reasoning with enhanced information retrieval. The documentation explicitly frames it as a reasoning model rather than a search-only model.
The docs show that Sonar Reasoning Pro outputs a <think> section containing reasoning tokens, followed by a valid JSON object. Perplexity also notes that the response_format parameter does not remove those reasoning tokens, so custom parsing may be needed.
Independent evaluations · Artificial Analysis
Evaluate specifications, pricing, and independent benchmark indices
| Model Details | |||
|---|---|---|---|
| General Info | |||
| Provider | Perplexity | Anthropic | Anthropic |
| Release Date | January 28, 2025 | July 24, 2026 | June 9, 2026 |
| Knowledge Cutoff | - | May 2026 | - |
| Context & Limits | |||
| Context Window | 128K | 1M Best Context Window | 1M Best Context Window |
| Pricing (per 1M tokens) | |||
| Input Pricing | Free Best Input Pricing | $5 | $10 |
| Output Pricing | Free Best Output Pricing | $25 | $50 |
| Modalities | |||
| Inputs | textimage | textimage | textimagefile |
| Outputs | text | text | text |
| Benchmarks (0-100) | |||
| Intelligence Index | 18.0 | 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.
