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

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-08-13.

Google: Gemini 3.6 Flash OpenAI: GPT-5.6 Luna (batch)
Vendorgoogleopenai
Quality Score100100
Benchmark Score84.488.2
Input Price$1.50/M$0.10/M
Output Price$7.50/M$0.60/M
Context Window1,048,5761,050,000
Max Output65,536128,000
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio✓-
Benchmark Scores
ai_index85.186.3
ai_index_agentic66.877.4
ai_index_coding100.0100.0

Who wins by task?

TaskGoogle: Gemini 3.6 FlashOpenAI: GPT-5.6 Luna (batch)
SQL Generation 169 172
Code Review 165 167
Code Completion 119 133
Code Refactoring 163 164
Bug Fixing 178 180
Unit Test Generation 153 154
Code Documentation 141 143
Regex Writing 134 137
CI/CD Pipelines 143 144
Frontend Component Design 145 146
Data Analysis 168 171
CSV / Spreadsheet Cleanup 153 154
ETL Scripting 153 154
JSON Extraction 139 149
Bulk Data Labeling 125 135
OCR / Document Parsing 146 146
Table Extraction from PDFs 146 146
Long-Document Summarization 158 160
Short-Form Summarization 122 132
Blog Post Writing 139 140

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

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