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

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-09-23.

Google: Gemini 3.6 Flash (batch) OpenAI: GPT-5.6 Luna
Vendorgoogleopenai
Quality Score100100
Benchmark Score56.162.3
Input Price$0.38/M$0.20/M
Output Price$1.88/M$1.20/M
Context Window1,048,5761,050,000
Max Output65,536128,000
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio✓-
Benchmark Scores
ai_index56.161.6

Who wins by task?

TaskGoogle: Gemini 3.6 Flash (batch)OpenAI: GPT-5.6 Luna
SQL Generation 140 141
Code Review 142 143
Code Completion 132 133
Code Refactoring 145 145
Bug Fixing 146 147
Unit Test Generation 130 131
Code Documentation 136 137
Regex Writing 125 125
CI/CD Pipelines 126 127
Frontend Component Design 128 129
Data Analysis 132 133
CSV / Spreadsheet Cleanup 136 136
ETL Scripting 135 136
JSON Extraction 131 131
Bulk Data Labeling 129 129
OCR / Document Parsing 133 134
Table Extraction from PDFs 133 134
Long-Document Summarization 146 147
Short-Form Summarization 126 126
Blog Post Writing 128 129

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

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