head-to-head

Anthropic: Claude Opus 5.5 (batch) vs DeepSeek: DeepSeek Flash Latest

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

	Anthropic: Claude Opus 5.5 (batch)	DeepSeek: DeepSeek Flash Latest
Vendor	anthropic	~deepseek
Quality Score	100	100
Benchmark Score	100.0	-
Input Price	$2.00/M	$0.10/M
Output Price	$10.00/M	$0.49/M
Context Window	1,000,000	1,048,576
Max Output	128,000	943,718
Tool Calling	✓	✓
Structured Output	✓	✓
Reasoning Mode	✓	✓
Vision	✓	✓
Audio	-	-
Benchmark Scores
ai_index	95.1	-

Who wins by task?

Task	Anthropic: Claude Opus 5.5 (batch)	DeepSeek: DeepSeek Flash Latest
SQL Generation	144	133
Code Review	150	132
Code Completion	119	131
Code Refactoring	151	136
Bug Fixing	154	136
Unit Test Generation	135	124
Code Documentation	138	131
Regex Writing	127	119
CI/CD Pipelines	131	120
Frontend Component Design	133	122
Data Analysis	138	124
CSV / Spreadsheet Cleanup	136	133
ETL Scripting	141	128
JSON Extraction	121	131
Bulk Data Labeling	118	129
OCR / Document Parsing	135	131
Table Extraction from PDFs	135	131
Long-Document Summarization	152	137
Short-Form Summarization	118	123
Blog Post Writing	132	121

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