LLM Comparison
GPT-5.5 Pro vs Sonar Reasoning Pro
Side-by-side specs, pricing & capabilities
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2/6 modelsSame tier:
| Organization | ||
| OpenTools Score | ||
| Family | GPT | Sonar |
| Status | Current | Current |
| Release Date | Apr 2026 | Mar 2025 |
| Context Window | 1.1M tokens | 128K tokens |
| Input Price | $30.00/M tokens | $2.00/M tokens |
| Output Price | $180.00/M tokens | $8.00/M tokens |
| Pricing Notes | No cached input discount. Long context (>272K tokens): 2x input, 1.5x output. Batch API: 50% discount. Regional processing: 10% uplift. | — |
| Capabilities | textvisioncodetool-useextended-thinkingweb-search | textvisioncodeextended-thinking |
| Training Cutoff | Dec 01, 2025 | — |
| Max Output | 128K tokens | — |
| API Identifier | openai/gpt-5.5-pro | perplexity/sonar-reasoning-pro |
| View GPT-5.5 Pro | View Sonar Reasoning Pro |
Cost Calculator
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| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| Sonar Reasoning ProCheapest | $2.00 | $4.00 | $6.00 | — |
| GPT-5.5 Pro | $30.00 | $90.00 | $120.00 | +1900% |
OpenAI
GPT-5.5 Pro
GPT-5.5 Pro uses more compute to think harder and provide consistently better answers than GPT-5.5. Designed for the toughest problems, some requests may take several minutes. It excels at FrontierMath Tier 4 (39.6%) and BrowseComp (90.1%), offering the highest intelligence available from OpenAI at a premium price point.
Perplexity AI
Sonar Reasoning Pro
Sonar Reasoning Pro is a multimodal llm from Perplexity AI. Supports up to 128,000 token context window. Achieves 83.0% on MMLU. Available from $2.00/M input tokens.
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