OpenAI: GPT-5.5 vs Perplexity: Sonar Reasoning Pro
Side-by-side comparison — pricing, context window, capabilities, and live leaderboard data.
Key differences
- OpenAI: GPT-5.5 has a 1050K-token context window — 8.2× larger than Perplexity: Sonar Reasoning Pro's 128K.
- Perplexity: Sonar Reasoning Pro is 60% cheaper per 1K input tokens than OpenAI: GPT-5.5 ($0.0020 vs $0.0050).
- OpenAI: GPT-5.5 is built by OpenAI; Perplexity: Sonar Reasoning Pro is built by Perplexity.
Specifications
| OpenAI: GPT-5.5 | Perplexity: Sonar Reasoning Pro | |
|---|---|---|
| Provider | OpenAI | Perplexity |
| Context window | 1050K | 128K |
| Max output tokens | 8192 | 8192 |
| Input price / 1K tokens | $0.0050 | $0.0020 |
| Output price / 1K tokens | $0.0300 | $0.0080 |
| Vision support | Yes | Yes |
| Function calling | No | No |
| License | Proprietary | Proprietary |
About OpenAI: GPT-5.5
US·ClosedGPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks. It features a 1M+ token...
View OpenAI: GPT-5.5 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
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