Claude Sonnet 4.6 vs Grok 4.20
Pricing, context window, and benchmark comparison · Last updated April 2026
Grok 4.20 is cheaper than Claude Sonnet 4.6 at $2.00/1M/1M vs $3.00/1M/1M input tokens — a 1.5x cost difference. Claude Sonnet 4.6 scores higher on quality benchmarks (ELO 1390). Choose Grok 4.20 for cost-sensitive workloads; choose Claude Sonnet 4.6 for maximum quality.
Which is cheaper: Claude Sonnet 4.6 or Grok 4.20?
Grok 4.20 is the cheaper option at $2.00/1M per 1M input tokens, compared to $3.00/1M for Claude Sonnet 4.6. That is a 1.5x cost difference on input tokens. Output pricing follows a similar pattern: Claude Sonnet 4.6 charges $15.00/1M/1M vs $6.00/1M/1M for Grok 4.20.
Which has better quality: Claude Sonnet 4.6 or Grok 4.20?
Based on LMSYS Chatbot Arena rankings, Claude Sonnet 4.6 achieves a higher ELO score (1390 vs 1380), suggesting stronger performance on open-ended tasks. Claude Sonnet 4.6 excels at best combination of speed and intelligence in the claude family. Grok 4.20 is known for 2m token context window — tied for largest available.
Which should you choose: Claude Sonnet 4.6 or Grok 4.20?
- → Best combination of speed and intelligence in the Claude family
- → 1M token context window at standard pricing
- → Extended thinking and adaptive thinking supported
- → 2M token context window — tied for largest available
- → Real-time X (Twitter) data access
- → Strong reasoning and multi-agent variants
Frequently Asked Questions
Which is cheaper: Claude Sonnet 4.6 or Grok 4.20?
Grok 4.20 is cheaper at $2.00/1M per 1M input tokens, making it 1.5x more affordable.
Which has better quality: Claude Sonnet 4.6 or Grok 4.20?
Claude Sonnet 4.6 scores higher on the LMSYS Chatbot Arena with an ELO of 1390, suggesting better overall quality for most tasks.
Which has a larger context window: Claude Sonnet 4.6 or Grok 4.20?
Grok 4.20 has a larger context window at 2000K tokens.
Should I choose Claude Sonnet 4.6 or Grok 4.20?
Choose Grok 4.20 if cost is the priority. Choose Claude Sonnet 4.6 if benchmark quality is most important. Consider your specific use case: Claude Sonnet 4.6 is best for coding and function-calling, while Grok 4.20 excels at reasoning and research.
Is Claude Sonnet 4.6 or Grok 4.20 open source?
Claude Sonnet 4.6 is proprietary. Grok 4.20 is proprietary.