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

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

OpenAI: GPT-5.6 Luna Pro (batch) Google: Gemini 3.5 Flash
Vendoropenaigoogle
Quality Score100100
Benchmark Score-84.3
Input Price$0.10/M$1.50/M
Output Price$0.60/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-85.7
ai_index_agentic-65.5
ai_index_coding-100.0

Who wins by task?

TaskOpenAI: GPT-5.6 Luna Pro (batch)Google: Gemini 3.5 Flash
SQL Generation 133 169
Code Review 132 165
Code Completion 131 119
Code Refactoring 136 163
Bug Fixing 136 178
Unit Test Generation 124 153
Code Documentation 131 141
Regex Writing 119 134
CI/CD Pipelines 120 143
Frontend Component Design 122 145
Data Analysis 124 168
CSV / Spreadsheet Cleanup 133 153
ETL Scripting 128 153
JSON Extraction 131 138
Bulk Data Labeling 129 124
OCR / Document Parsing 131 146
Table Extraction from PDFs 131 146
Long-Document Summarization 137 158
Short-Form Summarization 123 122
Blog Post Writing 121 139

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

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