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Google: Gemini 3.6 Flash vs OpenAI: GPT-5.6 Terra (batch)

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-08-13.

Google: Gemini 3.6 Flash OpenAI: GPT-5.6 Terra (batch)
Vendorgoogleopenai
Quality Score100100
Benchmark Score84.492.7
Input Price$1.50/M$1.00/M
Output Price$7.50/M$6.00/M
Context Window1,048,5761,050,000
Max Output65,536128,000
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio✓-
Benchmark Scores
ai_index85.193.3
ai_index_agentic66.882.8
ai_index_coding100.0100.0

Who wins by task?

TaskGoogle: Gemini 3.6 FlashOpenAI: GPT-5.6 Terra (batch)
SQL Generation 169 173
Code Review 165 169
Code Completion 119 120
Code Refactoring 163 165
Bug Fixing 178 183
Unit Test Generation 153 155
Code Documentation 141 143
Regex Writing 134 136
CI/CD Pipelines 143 146
Frontend Component Design 145 148
Data Analysis 168 173
CSV / Spreadsheet Cleanup 153 154
ETL Scripting 153 155
JSON Extraction 139 140
Bulk Data Labeling 125 125
OCR / Document Parsing 146 147
Table Extraction from PDFs 146 147
Long-Document Summarization 158 161
Short-Form Summarization 122 123
Blog Post Writing 139 141

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

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