head-to-head

Google: Gemini 3.1 Pro Preview Custom Tools vs Anthropic: Claude Sonnet 4.6

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-05-12.

	Google: Gemini 3.1 Pro Preview Custom Tools	Anthropic: Claude Sonnet 4.6
Vendor	google	anthropic
Quality Score	100	100
Benchmark Score	-	80.0
Input Price	$2.00/M	$3.00/M
Output Price	$12.00/M	$15.00/M
Context Window	1,048,576	1,000,000
Max Output	65,536	128,000
Tool Calling	✓	✓
Structured Output	✓	✓
Reasoning Mode	✓	✓
Vision	✓	✓
Audio	✓	-
Benchmark Scores
ai_index	-	85.3
ai_index_agentic	-	100.0
ai_index_coding	-	84.1
aider_polyglot	-	61.3

Who wins by task?

Task	Google: Gemini 3.1 Pro Preview Custom Tools	Anthropic: Claude Sonnet 4.6
SQL Generation	132	181
Code Review	132	177
Code Completion	117	118
Code Refactoring	136	172
Bug Fixing	136	194
Unit Test Generation	124	163
Code Documentation	129	144
Regex Writing	117	139
CI/CD Pipelines	120	152
Frontend Component Design	122	153
Data Analysis	124	184
CSV / Spreadsheet Cleanup	132	158
ETL Scripting	128	162
JSON Extraction	121	141
Bulk Data Labeling	117	123
OCR / Document Parsing	131	150
Table Extraction from PDFs	131	150
Long-Document Summarization	136	166
Short-Form Summarization	113	123
Blog Post Writing	120	145

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