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Google: Gemini 3.6 Flash vs OpenAI: GPT-5.6 Luna

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-09-07.

Google: Gemini 3.6 Flash OpenAI: GPT-5.6 Luna
Vendorgoogleopenai
Quality Score100100
Benchmark Score73.882.5
Input Price$0.75/M$0.20/M
Output Price$3.75/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_index66.571.7
ai_index_agentic50.170.7
ai_index_coding100.0100.0

Who wins by task?

TaskGoogle: Gemini 3.6 FlashOpenAI: GPT-5.6 Luna
SQL Generation 165 169
Code Review 160 163
Code Completion 132 133
Code Refactoring 159 161
Bug Fixing 171 176
Unit Test Generation 150 152
Code Documentation 140 142
Regex Writing 132 135
CI/CD Pipelines 140 142
Frontend Component Design 142 144
Data Analysis 162 167
CSV / Spreadsheet Cleanup 152 153
ETL Scripting 149 152
JSON Extraction 147 148
Bulk Data Labeling 134 135
OCR / Document Parsing 145 146
Table Extraction from PDFs 145 146
Long-Document Summarization 155 157
Short-Form Summarization 129 131
Blog Post Writing 136 138

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

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