xAI: Grok 4.20 vs Perplexity: Sonar Reasoning Pro
Side-by-side comparison — pricing, context window, capabilities, and live leaderboard data.
Key differences
- xAI: Grok 4.20 has a 2000K-token context window — 15.6× larger than Perplexity: Sonar Reasoning Pro's 128K.
- xAI: Grok 4.20 is 38% cheaper per 1K input tokens than Perplexity: Sonar Reasoning Pro ($0.0013 vs $0.0020).
- xAI: Grok 4.20 is built by xAI; Perplexity: Sonar Reasoning Pro is built by Perplexity.
Specifications
| xAI: Grok 4.20 | Perplexity: Sonar Reasoning Pro | |
|---|---|---|
| Provider | xAI | Perplexity |
| Context window | 2000K | 128K |
| Max output tokens | 8192 | 8192 |
| Input price / 1K tokens | $0.0013 | $0.0020 |
| Output price / 1K tokens | $0.0025 | $0.0080 |
| Vision support | Yes | Yes |
| Function calling | No | No |
| License | Proprietary | Proprietary |
About xAI: Grok 4.20
US·ClosedGrok 4.20 is a reasoning model from xAI with industry-leading speed and agentic tool calling capabilities. It combines the lowest hallucination rate on the market with strict prompt adherance, delivering...
View xAI: Grok 4.20 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 xAI: Grok 4.20 and Perplexity: Sonar Reasoning Pro side-by-side on PromptPit.
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