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OpenAI: GPT-5.6 Luna (batch) vs Google: Gemini 3.1 Flash Lite

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

OpenAI: GPT-5.6 Luna (batch) Google: Gemini 3.1 Flash Lite
Vendoropenaigoogle
Quality Score100100
Benchmark Score88.2-
Input Price$0.10/M$0.25/M
Output Price$0.60/M$1.50/M
Context Window1,050,0001,048,576
Max Output128,00065,536
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio-✓
Benchmark Scores
ai_index86.3-
ai_index_agentic77.4-
ai_index_coding100.0-

Who wins by task?

TaskOpenAI: GPT-5.6 Luna (batch)Google: Gemini 3.1 Flash Lite
SQL Generation 172 133
Code Review 167 132
Code Completion 133 131
Code Refactoring 164 136
Bug Fixing 180 136
Unit Test Generation 154 124
Code Documentation 143 131
Regex Writing 137 119
CI/CD Pipelines 144 120
Frontend Component Design 146 122
Data Analysis 171 124
CSV / Spreadsheet Cleanup 154 133
ETL Scripting 154 128
JSON Extraction 149 131
Bulk Data Labeling 135 129
OCR / Document Parsing 146 131
Table Extraction from PDFs 146 131
Long-Document Summarization 160 137
Short-Form Summarization 132 123
Blog Post Writing 140 121

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

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