head-to-head

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

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-11-07.

	Google: Gemini 3.1 Pro Preview Custom Tools	Google: Gemini 3.1 Pro Preview
Vendor	google	google
Quality Score	100	100
Benchmark Score	-	74.7
Input Price	$2.00/M	$2.00/M
Output Price	$12.00/M	$12.00/M
Context Window	1,048,576	1,048,576
Max Output	65,536	65,536
Tool Calling	✓	✓
Structured Output	✓	✓
Reasoning Mode	✓	✓
Vision	✓	✓
Audio	✓	✓
Benchmark Scores
ai_index	-	76.7
ai_index_agentic	-	35.3
ai_index_coding	-	100.0
eqbench	-	64.7

The verdict

For a sample job of 1 million input tokens and 250,000 output tokens, both cost $5.00 at current list prices.

Both read up to 1,048,576 tokens at once, roughly 1,573 pages of text.

Across the 20 tasks where they differ, Gemini 3.1 Pro Preview on 20 (SQL Generation, Code Review, Code Completion and others).

Pick Gemini 3.1 Pro Preview if you need the stronger all-round task scores.

Costs use current list prices per million tokens; page counts assume about 0.75 words per token and 500 words per page.

Task	Google: Gemini 3.1 Pro Preview Custom Tools	Google: Gemini 3.1 Pro Preview
SQL Generation	132	168
Code Review	132	168
Code Completion	117	120
Code Refactoring	136	168
Bug Fixing	136	177
Unit Test Generation	124	154
Code Documentation	129	144
Regex Writing	117	133
CI/CD Pipelines	120	145
Frontend Component Design	122	145
Data Analysis	124	164
CSV / Spreadsheet Cleanup	132	155
ETL Scripting	128	156
JSON Extraction	121	137
Bulk Data Labeling	117	123
OCR / Document Parsing	131	147
Table Extraction from PDFs	131	147
Long-Document Summarization	136	163
Short-Form Summarization	113	121
Blog Post Writing	120	140

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