head-to-head

Google: Gemini 3.1 Flash Lite Preview vs OpenAI: GPT-5.3-Codex

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

	Google: Gemini 3.1 Flash Lite Preview	OpenAI: GPT-5.3-Codex
Vendor	google	openai
Quality Score	100	100
Benchmark Score	-	53.3
Input Price	$0.25/M	$1.75/M
Output Price	$1.50/M	$14.00/M
Context Window	1,048,576	400,000
Max Output	65,536	128,000
Tool Calling	✓	✓
Structured Output	✓	✓
Reasoning Mode	✓	✓
Vision	✓	✓
Audio	✓	-
Benchmark Scores
ai_index	-	53.6

Who wins by task?

Task	Google: Gemini 3.1 Flash Lite Preview	OpenAI: GPT-5.3-Codex
SQL Generation	133	138
Code Review	132	142
Code Completion	131	117
Code Refactoring	136	144
Bug Fixing	136	146
Unit Test Generation	124	130
Code Documentation	131	133
Regex Writing	119	122
CI/CD Pipelines	120	126
Frontend Component Design	122	128
Data Analysis	124	132
CSV / Spreadsheet Cleanup	133	134
ETL Scripting	128	135
JSON Extraction	131	120
Bulk Data Labeling	129	117
OCR / Document Parsing	131	133
Table Extraction from PDFs	131	133
Long-Document Summarization	137	145
Short-Form Summarization	123	115
Blog Post Writing	121	126

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