GPT-5.5 vs Sonar Reasoning Pro
OpenAI vs Perplexity — benchmarks, pricing, and capabilities side by side.
- •Sonar Reasoning Pro has the higher intelligence index (95.7 vs 76.1)
- •Sonar Reasoning Pro is cheaper ($2.00 vs $5.00 per 1M input)
- •GPT-5.5 has a larger context window (1.1M)
| GPT-5.5 | Sonar Reasoning Pro | |
|---|---|---|
| Intelligence index | 76.1 | 95.7 |
| Developer | OpenAI | Perplexity |
| Type | LLM | Multimodal |
| Access | API only | API only |
| Context window | 1,050,000 tokens | 128,000 tokens |
| Input price | $5.00 / 1M | $2.00 / 1M |
| Output price | $30.00 / 1M | $8.00 / 1M |
| Speed | 67 tok/s | — |
| Released | April 23, 2026 | March 7, 2025 |
| Parameters | — | — |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |