head-to-head

Anthropic: Claude Sonnet 5 (batch) vs xAI: Grok 4.3

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-07-30.

	Anthropic: Claude Sonnet 5 (batch)	xAI: Grok 4.3
Vendor	anthropic	x-ai
Quality Score	100	100
Benchmark Score	90.4	58.0
Input Price	$1.00/M	$1.25/M
Output Price	$5.00/M	$2.50/M
Context Window	1,000,000	1,000,000
Max Output	128,000	-
Tool Calling	✓	✓
Structured Output	✓	✓
Reasoning Mode	✓	✓
Vision	✓	✓
Audio	-	-
Benchmark Scores
ai_index	88.0	62.0
ai_index_agentic	77.0	39.8
ai_index_coding	100.0	69.7

Who wins by task?

Task	Anthropic: Claude Sonnet 5 (batch)	xAI: Grok 4.3
SQL Generation	171	158
Code Review	167	155
Code Completion	120	120
Code Refactoring	164	155
Bug Fixing	180	164
Unit Test Generation	154	144
Code Documentation	143	139
Regex Writing	136	130
CI/CD Pipelines	144	136
Frontend Component Design	146	138
Data Analysis	171	153
CSV / Spreadsheet Cleanup	154	147
ETL Scripting	154	145
JSON Extraction	140	134
Bulk Data Labeling	126	124
OCR / Document Parsing	146	141
Table Extraction from PDFs	146	141
Long-Document Summarization	160	152
Short-Form Summarization	123	120
Blog Post Writing	140	134

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