head-to-head

OpenAI: GPT-5.4 Mini vs Google: Gemini 3.1 Pro Preview Custom Tools

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-09-23.

	OpenAI: GPT-5.4 Mini	Google: Gemini 3.1 Pro Preview Custom Tools
Vendor	openai	google
Quality Score	100	100
Benchmark Score	37.7	-
Input Price	$0.75/M	$2.00/M
Output Price	$4.50/M	$12.00/M
Context Window	400,000	1,048,576
Max Output	128,000	65,536
Tool Calling	✓	✓
Structured Output	✓	✓
Reasoning Mode	✓	✓
Vision	✓	✓
Audio	-	✓
Benchmark Scores
ai_index	39.7	-

Who wins by task?

Task	OpenAI: GPT-5.4 Mini	Google: Gemini 3.1 Pro Preview Custom Tools
SQL Generation	138	132
Code Review	139	132
Code Completion	131	117
Code Refactoring	142	136
Bug Fixing	143	136
Unit Test Generation	128	124
Code Documentation	134	129
Regex Writing	122	117
CI/CD Pipelines	124	120
Frontend Component Design	126	122
Data Analysis	130	124
CSV / Spreadsheet Cleanup	135	132
ETL Scripting	133	128
JSON Extraction	130	121
Bulk Data Labeling	128	117
OCR / Document Parsing	133	131
Table Extraction from PDFs	133	131
Long-Document Summarization	143	136
Short-Form Summarization	124	113
Blog Post Writing	126	120

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