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

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

Google: Gemini 3.5 Flash Lite OpenAI: GPT-5.6 Luna Pro
Vendorgoogleopenai
Quality Score100100
Benchmark Score51.5-
Input Price$0.30/M$0.20/M
Output Price$2.50/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_index45.5-
ai_index_agentic26.5-
ai_index_coding81.4-

Who wins by task?

TaskGoogle: Gemini 3.5 Flash LiteOpenAI: GPT-5.6 Luna Pro
SQL Generation 156 133
Code Review 152 132
Code Completion 132 131
Code Refactoring 152 136
Bug Fixing 160 136
Unit Test Generation 143 124
Code Documentation 138 131
Regex Writing 128 119
CI/CD Pipelines 134 120
Frontend Component Design 136 122
Data Analysis 150 124
CSV / Spreadsheet Cleanup 148 133
ETL Scripting 143 128
JSON Extraction 144 131
Bulk Data Labeling 133 129
OCR / Document Parsing 141 131
Table Extraction from PDFs 141 131
Long-Document Summarization 149 137
Short-Form Summarization 128 123
Blog Post Writing 132 121

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

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