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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 2026-09-07.

Google: Gemini 3.5 Flash Lite OpenAI: GPT-5.6 Luna
Vendorgoogleopenai
Quality Score100100
Benchmark Score51.582.5
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_index45.571.7
ai_index_agentic26.570.7
ai_index_coding81.4100.0

Who wins by task?

TaskGoogle: Gemini 3.5 Flash LiteOpenAI: GPT-5.6 Luna
SQL Generation 156 169
Code Review 152 163
Code Completion 132 133
Code Refactoring 152 161
Bug Fixing 160 176
Unit Test Generation 143 152
Code Documentation 138 142
Regex Writing 128 135
CI/CD Pipelines 134 142
Frontend Component Design 136 144
Data Analysis 150 167
CSV / Spreadsheet Cleanup 148 153
ETL Scripting 143 152
JSON Extraction 144 148
Bulk Data Labeling 133 135
OCR / Document Parsing 141 146
Table Extraction from PDFs 141 146
Long-Document Summarization 149 157
Short-Form Summarization 128 131
Blog Post Writing 132 138

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

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