head-to-head

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

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-09-23.

	OpenAI: GPT-5.6 Luna Pro	Google: Gemini 3.1 Flash Lite (batch)
Vendor	openai	google
Quality Score	100	100
Input Price	$0.20/M	$0.12/M
Output Price	$1.20/M	$0.75/M
Context Window	1,050,000	1,048,576
Max Output	128,000	65,536
Tool Calling	✓	✓
Structured Output	✓	✓
Reasoning Mode	✓	✓
Vision	✓	✓
Audio	-	✓

Who wins by task?

Task	OpenAI: GPT-5.6 Luna Pro	Google: Gemini 3.1 Flash Lite (batch)
Code Completion	131	131
Code Documentation	131	131
Regex Writing	119	119
JSON Extraction	131	131
Bulk Data Labeling	129	129
Short-Form Summarization	123	123

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