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Anthropic: Claude Sonnet 5 vs xAI: Grok 4.3

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

Anthropic: Claude Sonnet 5 xAI: Grok 4.3
Vendoranthropicx-ai
Quality Score100100
Benchmark Score-58.8
Input Price$2.00/M$1.25/M
Output Price$10.00/M$2.50/M
Context Window1,000,0001,000,000
Max Output128,000-
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio--
Benchmark Scores
ai_index-62.0
ai_index_agentic-39.8
ai_index_coding-69.7

Who wins by task?

TaskAnthropic: Claude Sonnet 5xAI: Grok 4.3
SQL Generation 132 158
Code Review 132 155
Code Completion 117 120
Code Refactoring 136 155
Bug Fixing 136 164
Unit Test Generation 124 144
Code Documentation 129 139
Regex Writing 117 130
CI/CD Pipelines 120 136
Frontend Component Design 122 138
Data Analysis 124 153
CSV / Spreadsheet Cleanup 132 147
ETL Scripting 128 145
JSON Extraction 121 134
Bulk Data Labeling 118 124
OCR / Document Parsing 131 141
Table Extraction from PDFs 131 141
Long-Document Summarization 136 152
Short-Form Summarization 113 120
Blog Post Writing 120 134

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

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