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OpenAI: GPT-5.6 Terra Pro vs Google: Gemini 3.5 Flash

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-07-10.

OpenAI: GPT-5.6 Terra Pro Google: Gemini 3.5 Flash
Vendoropenaigoogle
Quality Score100100
Benchmark Score-84.6
Input Price$2.50/M$1.50/M
Output Price$15.00/M$9.00/M
Context Window1,050,0001,048,576
Max Output128,00065,536
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio-✓
Benchmark Scores
ai_index-82.8
ai_index_agentic-61.8
ai_index_coding-100.0

Who wins by task?

TaskOpenAI: GPT-5.6 Terra ProGoogle: Gemini 3.5 Flash
SQL Generation 132 168
Code Review 132 164
Code Completion 116 119
Code Refactoring 136 162
Bug Fixing 136 176
Unit Test Generation 124 152
Code Documentation 128 141
Regex Writing 116 133
CI/CD Pipelines 120 143
Frontend Component Design 122 145
Data Analysis 124 167
CSV / Spreadsheet Cleanup 132 153
ETL Scripting 128 152
JSON Extraction 120 138
Bulk Data Labeling 116 124
OCR / Document Parsing 131 146
Table Extraction from PDFs 131 146
Long-Document Summarization 136 157
Short-Form Summarization 112 121
Blog Post Writing 120 138

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

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