LLM Comparison
Sonar Reasoning Pro vs Grok 4.20
Side-by-side specs, pricing & capabilities · Updated May 2026
Price vs Intelligence
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2/6 modelsSame tier:
| Organization | ||
| OpenTools Score | 44 8.8 | 77 19.1 |
| Family | Sonar | Grok |
| Status | Current | Current |
| Release Date | Mar 2025 | Mar 2026 |
| Context Window | 128K tokens | 2.0M tokens |
| Input Price | $2.00/M tokens | $2.00/M tokens |
| Output Price | $8.00/M tokens | $6.00/M tokens |
| Pricing Notes | — | Cache read: $0.2000/M tokens |
| Capabilities | textvisioncodeextended-thinking | textvisioncode |
| API Identifier | perplexity/sonar-reasoning-pro | x-ai/grok-4.20 |
| Benchmarks | ||
| GPQA Diamond | 62.3perplexity | — |
| MATH-500 | 92.1perplexity | — |
| AIME | 77perplexity | — |
| MMLU Pro | 79perplexity | — |
| View Sonar Reasoning Pro | View Grok 4.20 | |
Cost Calculator
Enter your expected monthly token usage to compare costs.
| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| Grok 4.20Cheapest | $2.00 | $3.00 | $5.00 | — |
| Sonar Reasoning Pro | $2.00 | $4.00 | $6.00 | +20% |
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.
xAI
Grok 4.20
Grok 4.20 is a multimodal llm from xAI. Supports up to 2,000,000 token context window. Available from $2.00/M input tokens.
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