head-to-head

Google: Gemini 3.5 Flash vs Google: Gemini 3.1 Pro Preview Custom Tools

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-06-12.

	Google: Gemini 3.5 Flash	Google: Gemini 3.1 Pro Preview Custom Tools
Vendor	google	google
Quality Score	100	100
Benchmark Score	88.3	-
Input Price	$1.50/M	$2.00/M
Output Price	$9.00/M	$12.00/M
Context Window	1,048,576	1,048,756
Max Output	65,536	65,536
Tool Calling	✓	✓
Structured Output	✓	✓
Reasoning Mode	✓	✓
Vision	✓	✓
Audio	✓	✓
Benchmark Scores
ai_index	91.3	-
ai_index_agentic	100.0	-
ai_index_coding	74.2	-

Who wins by task?

Task	Google: Gemini 3.5 Flash	Google: Gemini 3.1 Pro Preview Custom Tools
SQL Generation	170	132
Code Review	167	132
Code Completion	119	117
Code Refactoring	164	136
Bug Fixing	183	136
Unit Test Generation	153	124
Code Documentation	142	129
Regex Writing	136	117
CI/CD Pipelines	144	120
Frontend Component Design	146	122
Data Analysis	172	124
CSV / Spreadsheet Cleanup	150	132
ETL Scripting	154	128
JSON Extraction	136	121
Bulk Data Labeling	123	117
OCR / Document Parsing	145	131
Table Extraction from PDFs	145	131
Long-Document Summarization	160	136
Short-Form Summarization	122	113
Blog Post Writing	140	120

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