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Anthropic: Claude Sonnet 5 vs xAI: Grok 4.20

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-07-01.

Anthropic: Claude Sonnet 5 xAI: Grok 4.20
Vendoranthropicx-ai
Quality Score100100
Benchmark Score-61.5
Input Price$2.00/M$1.25/M
Output Price$10.00/M$2.50/M
Context Window1,000,0002,000,000
Max Output128,000-
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio--
Benchmark Scores
ai_index-61.0
eqbench-55.8

Who wins by task?

TaskAnthropic: Claude Sonnet 5xAI: Grok 4.20
SQL Generation 132 144
Code Review 132 150
Code Completion 117 122
Code Refactoring 136 153
Bug Fixing 136 154
Unit Test Generation 124 135
Code Documentation 129 141
Regex Writing 117 127
CI/CD Pipelines 120 131
Frontend Component Design 122 131
Data Analysis 124 136
CSV / Spreadsheet Cleanup 132 139
ETL Scripting 128 142
JSON Extraction 121 123
Bulk Data Labeling 118 120
OCR / Document Parsing 131 135
Table Extraction from PDFs 131 135
Long-Document Summarization 136 154
Short-Form Summarization 113 119
Blog Post Writing 120 132

Scores reflect capability match + benchmark data + pricing for each task. Methodology →

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