head-to-head

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

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

	Google: Gemini 3.5 Flash Lite (batch)	OpenAI: GPT-5.6 Luna Pro (batch)
Vendor	google	openai
Quality Score	100	100
Benchmark Score	62.3	-
Input Price	$0.15/M	$0.10/M
Output Price	$1.25/M	$0.60/M
Context Window	1,048,576	1,050,000
Max Output	65,536	128,000
Tool Calling	✓	✓
Structured Output	✓	✓
Reasoning Mode	✓	✓
Vision	✓	✓
Audio	✓	-
Benchmark Scores
ai_index	61.8	-
ai_index_agentic	44.8	-
ai_index_coding	81.4	-

Who wins by task?

Task	Google: Gemini 3.5 Flash Lite (batch)	OpenAI: GPT-5.6 Luna Pro (batch)
SQL Generation	161	133
Code Review	157	132
Code Completion	133	131
Code Refactoring	156	136
Bug Fixing	166	136
Unit Test Generation	146	124
Code Documentation	140	131
Regex Writing	131	119
CI/CD Pipelines	137	120
Frontend Component Design	139	122
Data Analysis	157	124
CSV / Spreadsheet Cleanup	149	133
ETL Scripting	147	128
JSON Extraction	145	131
Bulk Data Labeling	134	129
OCR / Document Parsing	143	131
Table Extraction from PDFs	143	131
Long-Document Summarization	153	137
Short-Form Summarization	129	123
Blog Post Writing	135	121

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