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Google: Gemini 3.5 Flash Lite vs OpenAI: GPT-5.6 Luna

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

Google: Gemini 3.5 Flash Lite OpenAI: GPT-5.6 Luna
Vendorgoogleopenai
Quality Score100100
Benchmark Score62.388.2
Input Price$0.30/M$0.10/M
Output Price$2.50/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_index61.886.3
ai_index_agentic44.877.4
ai_index_coding81.4100.0

Who wins by task?

TaskGoogle: Gemini 3.5 Flash LiteOpenAI: GPT-5.6 Luna
SQL Generation 161 172
Code Review 157 167
Code Completion 132 133
Code Refactoring 156 164
Bug Fixing 166 180
Unit Test Generation 146 154
Code Documentation 140 143
Regex Writing 131 137
CI/CD Pipelines 137 144
Frontend Component Design 139 146
Data Analysis 157 171
CSV / Spreadsheet Cleanup 149 154
ETL Scripting 147 154
JSON Extraction 145 149
Bulk Data Labeling 133 135
OCR / Document Parsing 143 146
Table Extraction from PDFs 143 146
Long-Document Summarization 153 160
Short-Form Summarization 129 132
Blog Post Writing 135 140

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

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