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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 2026-04-29.

OpenAI: GPT-5.4 Mini Google: Gemini 3.1 Pro Preview Custom Tools
Vendoropenaigoogle
Quality Score100100
Input Price$0.75/M$2.00/M
Output Price$4.50/M$12.00/M
Context Window400,0001,048,576
Max Output128,00065,536
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio-✓

Who wins by task?

TaskOpenAI: GPT-5.4 MiniGoogle: Gemini 3.1 Pro Preview Custom Tools
SQL Generation 133 132
Code Completion 130 117
Code Documentation 130 129
Regex Writing 119 117
CSV / Spreadsheet Cleanup 133 132
JSON Extraction 130 121
Bulk Data Labeling 128 117
Long-Document Summarization 137 136
Short-Form Summarization 123 113
Blog Post Writing 121 120

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

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