OpenAI: GPT-5.5 Pro vs Perplexity: Sonar Reasoning Pro
Side-by-side comparison — pricing, context window, capabilities, and live leaderboard data.
Key differences
- OpenAI: GPT-5.5 Pro has a 1050K-token context window — 8.2× larger than Perplexity: Sonar Reasoning Pro's 128K.
- Perplexity: Sonar Reasoning Pro is 93% cheaper per 1K input tokens than OpenAI: GPT-5.5 Pro ($0.0020 vs $0.0300).
- OpenAI: GPT-5.5 Pro is built by OpenAI; Perplexity: Sonar Reasoning Pro is built by Perplexity.
Specifications
| OpenAI: GPT-5.5 Pro | Perplexity: Sonar Reasoning Pro | |
|---|---|---|
| Provider | OpenAI | Perplexity |
| Context window | 1050K | 128K |
| Max output tokens | 8192 | 8192 |
| Input price / 1K tokens | $0.0300 | $0.0020 |
| Output price / 1K tokens | $0.1800 | $0.0080 |
| Vision support | Yes | Yes |
| Function calling | No | No |
| License | Proprietary | Proprietary |
About OpenAI: GPT-5.5 Pro
US·ClosedGPT-5.5 Pro is OpenAI’s high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads. It features a 1M+ token context window (922K input, 128K output) with support for...
View OpenAI: GPT-5.5 Pro reliability and benchmark history →About Perplexity: Sonar Reasoning Pro
US·ClosedNote: Sonar Pro pricing includes Perplexity search pricing. See [details here](https://docs.perplexity.ai/guides/pricing#detailed-pricing-breakdown-for-sonar-reasoning-pro-and-sonar-pro) Sonar Reasoning Pro is a premier reasoning model powered by DeepSeek R1 with Chain of Thought (CoT). Designed for...
View Perplexity: Sonar Reasoning Pro reliability and benchmark history →Try them yourself
Run the same prompt against OpenAI: GPT-5.5 Pro and Perplexity: Sonar Reasoning Pro side-by-side on PromptPit.
Start a comparison