head-to-head

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

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-08-22.

	DeepSeek: DeepSeek V4 Flash Vision Exp	OpenAI: GPT-5.6 Luna (batch)
Vendor	deepseek	openai
Quality Score	100	100
Benchmark Score	-	88.2
Input Price	$0.22/M	$0.10/M
Output Price	$0.66/M	$0.60/M
Context Window	1,048,576	1,050,000
Max Output	384,000	128,000
Tool Calling	✓	✓
Structured Output	✓	✓
Reasoning Mode	✓	✓
Vision	✓	✓
Audio	-	-
Benchmark Scores
ai_index	-	86.3
ai_index_agentic	-	77.4
ai_index_coding	-	100.0

Who wins by task?

Task	DeepSeek: DeepSeek V4 Flash Vision Exp	OpenAI: GPT-5.6 Luna (batch)
SQL Generation	133	172
Code Review	132	167
Code Completion	131	133
Code Refactoring	136	164
Bug Fixing	136	180
Unit Test Generation	124	154
Code Documentation	131	143
Regex Writing	119	137
CI/CD Pipelines	120	144
Frontend Component Design	122	146
Data Analysis	124	171
CSV / Spreadsheet Cleanup	133	154
ETL Scripting	128	154
JSON Extraction	131	149
Bulk Data Labeling	129	135
OCR / Document Parsing	131	146
Table Extraction from PDFs	131	146
Long-Document Summarization	137	160
Short-Form Summarization	123	132
Blog Post Writing	121	140

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