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OpenAI: GPT-5.6 Terra vs Google: Gemini 3.5 Flash (batch)

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-07-30.

OpenAI: GPT-5.6 Terra Google: Gemini 3.5 Flash (batch)
Vendoropenaigoogle
Quality Score100100
Benchmark Score91.983.3
Input Price$1.25/M$0.75/M
Output Price$7.50/M$4.50/M
Context Window1,050,0001,048,576
Max Output128,00065,536
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio-✓
Benchmark Scores
ai_index90.782.8
ai_index_agentic78.261.8
ai_index_coding100.0100.0

Who wins by task?

TaskOpenAI: GPT-5.6 TerraGoogle: Gemini 3.5 Flash (batch)
SQL Generation 172 169
Code Review 168 164
Code Completion 120 132
Code Refactoring 165 162
Bug Fixing 181 176
Unit Test Generation 155 152
Code Documentation 142 142
Regex Writing 136 134
CI/CD Pipelines 145 143
Frontend Component Design 147 145
Data Analysis 171 167
CSV / Spreadsheet Cleanup 154 153
ETL Scripting 155 152
JSON Extraction 139 147
Bulk Data Labeling 125 134
OCR / Document Parsing 147 146
Table Extraction from PDFs 147 146
Long-Document Summarization 160 158
Short-Form Summarization 123 130
Blog Post Writing 140 139

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

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