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

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
Vendorgoogleopenai
Quality Score100100
Benchmark Score73.885.5
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_index66.577.2
ai_index_agentic50.172.5
ai_index_coding100.0100.0

Who wins by task?

TaskGoogle: Gemini 3.6 FlashOpenAI: GPT-5.6 Terra
SQL Generation 165 169
Code Review 160 164
Code Completion 132 118
Code Refactoring 159 162
Bug Fixing 171 177
Unit Test Generation 150 153
Code Documentation 140 140
Regex Writing 132 133
CI/CD Pipelines 140 143
Frontend Component Design 142 145
Data Analysis 162 168
CSV / Spreadsheet Cleanup 152 152
ETL Scripting 149 152
JSON Extraction 147 138
Bulk Data Labeling 134 123
OCR / Document Parsing 145 146
Table Extraction from PDFs 145 146
Long-Document Summarization 155 157
Short-Form Summarization 129 121
Blog Post Writing 136 138

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

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