Perplexity: Sonar vs xAI: Grok 4 Fast
Side-by-side comparison of Perplexity: Sonar and xAI: Grok 4 Fast. Compare pricing, context window, capabilities, and find out which is better for your workflow.
Verdict
strong confidencexAI: Grok 4 Fast leads overall
xAI: Grok 4 Fast leads in price and context window and capabilities and max output, making it the stronger choice for most workflows. Perplexity: Sonar remains a solid alternative depending on your specific needs.
Best for with Perplexity: Sonar
Best for with xAI: Grok 4 Fast
Side-by-side
Technical specifications
| Perplexity: Sonar | xAI: Grok 4 Fast | |
|---|---|---|
| Provider | Perplexity | xAI |
| Input price | $1/M | $0.20/M |
| Output price | $1/M | $0.50/M |
| Context window | 127K | 2.0M |
| Max output | N/A | 30K |
| Capabilities | Vision | Tool useVisionReasoning |
| Released | Jan 27, 2025 | Sep 18, 2025 |
Scoring breakdown
How each dimension compares
Price
xAI: Grok 4 Fast leadsPerplexity: Sonar
$1/M tokens
xAI: Grok 4 Fast
$0.50/M tokens
Context Window
xAI: Grok 4 Fast leadsPerplexity: Sonar
127K tokens
xAI: Grok 4 Fast
2.0M tokens
Capabilities
xAI: Grok 4 Fast leadsPerplexity: Sonar
1/4
xAI: Grok 4 Fast
3/4
Max Output
xAI: Grok 4 Fast leadsPerplexity: Sonar
N/A
xAI: Grok 4 Fast
30K tokens
Recency
Perplexity: Sonar
Jan 2025
xAI: Grok 4 Fast
Sep 2025
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