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Google: Gemini 3.6 Flash vs OpenAI: GPT-5.6 Terra Pro

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-09-07.

Google: Gemini 3.6 Flash OpenAI: GPT-5.6 Terra Pro
Vendorgoogleopenai
Quality Score100100
Benchmark Score73.8-
Input Price$0.75/M$2.00/M
Output Price$3.75/M$12.00/M
Context Window1,048,5761,050,000
Max Output65,536128,000
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio✓-
Benchmark Scores
ai_index66.5-
ai_index_agentic50.1-
ai_index_coding100.0-

Who wins by task?

TaskGoogle: Gemini 3.6 FlashOpenAI: GPT-5.6 Terra Pro
SQL Generation 165 132
Code Review 160 132
Code Completion 132 117
Code Refactoring 159 136
Bug Fixing 171 136
Unit Test Generation 150 124
Code Documentation 140 129
Regex Writing 132 117
CI/CD Pipelines 140 120
Frontend Component Design 142 122
Data Analysis 162 124
CSV / Spreadsheet Cleanup 152 132
ETL Scripting 149 128
JSON Extraction 147 121
Bulk Data Labeling 134 117
OCR / Document Parsing 145 131
Table Extraction from PDFs 145 131
Long-Document Summarization 155 136
Short-Form Summarization 129 113
Blog Post Writing 136 120

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

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