head-to-head

DeepSeek: DeepSeek V4 Flash Vision Exp (batch) vs OpenAI: GPT-5.6 Luna Pro

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

	DeepSeek: DeepSeek V4 Flash Vision Exp (batch)	OpenAI: GPT-5.6 Luna Pro
Vendor	deepseek	openai
Quality Score	100	100
Benchmark Score	80.1	-
Input Price	$0.11/M	$0.20/M
Output Price	$0.33/M	$1.20/M
Context Window	1,048,576	1,050,000
Max Output	943,718	128,000
Tool Calling	✓	✓
Structured Output	✓	✓
Reasoning Mode	✓	✓
Vision	✓	✓
Audio	-	-
Benchmark Scores
ai_index	57.8	-
ai_index_agentic	79.4	-
ai_index_coding	100.0	-

Who wins by task?

Task	DeepSeek: DeepSeek V4 Flash Vision Exp (batch)	OpenAI: GPT-5.6 Luna Pro
SQL Generation	169	133
Code Review	161	132
Code Completion	133	131
Code Refactoring	159	136
Bug Fixing	175	136
Unit Test Generation	151	124
Code Documentation	141	131
Regex Writing	134	119
CI/CD Pipelines	141	120
Frontend Component Design	143	122
Data Analysis	167	124
CSV / Spreadsheet Cleanup	153	133
ETL Scripting	150	128
JSON Extraction	149	131
Bulk Data Labeling	135	129
OCR / Document Parsing	145	131
Table Extraction from PDFs	145	131
Long-Document Summarization	156	137
Short-Form Summarization	131	123
Blog Post Writing	137	121

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