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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 2026-07-30.

Google: Gemini 3.6 Flash (batch) OpenAI: GPT-5.6 Luna
Vendorgoogleopenai
Quality Score100100
Benchmark Score83.988.4
Input Price$0.75/M$0.50/M
Output Price$3.75/M$3.00/M
Context Window1,048,5761,050,000
Max Output65,536128,000
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio✓-
Benchmark Scores
ai_index82.684.5
ai_index_agentic63.975.2
ai_index_coding100.0100.0

Who wins by task?

TaskGoogle: Gemini 3.6 Flash (batch)OpenAI: GPT-5.6 Luna
SQL Generation 169 171
Code Review 165 166
Code Completion 132 133
Code Refactoring 162 163
Bug Fixing 177 179
Unit Test Generation 153 154
Code Documentation 142 143
Regex Writing 135 136
CI/CD Pipelines 143 144
Frontend Component Design 145 146
Data Analysis 167 170
CSV / Spreadsheet Cleanup 153 154
ETL Scripting 153 154
JSON Extraction 148 148
Bulk Data Labeling 134 134
OCR / Document Parsing 146 146
Table Extraction from PDFs 146 146
Long-Document Summarization 158 159
Short-Form Summarization 131 131
Blog Post Writing 139 140

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

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