head-to-head

Google: Gemma 4 31B 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.

	Google: Gemma 4 31B	Google: Gemini 3.1 Pro Preview Custom Tools
Vendor	google	google
Quality Score	100	100
Benchmark Score	53.7	-
Input Price	$0.09/M	$2.00/M
Output Price	$0.34/M	$12.00/M
Context Window	262,144	1,048,576
Max Output	16,384	65,536
Tool Calling	✓	✓
Structured Output	✓	✓
Reasoning Mode	✓	✓
Vision	✓	✓
Audio	-	✓
Benchmark Scores
ai_index	31.3	-
eqbench	70.8	-

Who wins by task?

Task	Google: Gemma 4 31B	Google: Gemini 3.1 Pro Preview Custom Tools
SQL Generation	139	132
Code Review	140	132
Code Completion	131	117
Code Refactoring	141	136
Bug Fixing	144	136
Unit Test Generation	130	124
Code Documentation	134	129
Regex Writing	125	117
CI/CD Pipelines	126	120
Frontend Component Design	128	122
Data Analysis	132	124
CSV / Spreadsheet Cleanup	133	132
ETL Scripting	133	128
JSON Extraction	131	121
Bulk Data Labeling	129	117
OCR / Document Parsing	131	131
Table Extraction from PDFs	131	131
Long-Document Summarization	143	136
Short-Form Summarization	126	113
Blog Post Writing	127	120

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