head-to-head

Z.ai: GLM 5.3 Flash vs DeepSeek: DeepSeek V4 Flash Latest

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

	Z.ai: GLM 5.3 Flash	DeepSeek: DeepSeek V4 Flash Latest
Vendor	z-ai	~deepseek
Quality Score	100	99
Benchmark Score	70.6	-
Input Price	$0.15/M	$0.03/M
Output Price	$0.50/M	$0.80/M
Context Window	1,310,720	1,310,720
Max Output	943,718	943,718
Tool Calling	✓	✓
Structured Output	✓	✓
Reasoning Mode	✓	✓
Vision	✓	-
Audio	-	-
Benchmark Scores
ai_index	69.0	-

Who wins by task?

Task	Z.ai: GLM 5.3 Flash	DeepSeek: DeepSeek V4 Flash Latest
SQL Generation	142	133
Code Review	145	131
Code Completion	133	131
Code Refactoring	147	135
Bug Fixing	149	135
Unit Test Generation	132	123
Code Documentation	138	131
Regex Writing	126	119
CI/CD Pipelines	128	119
Frontend Component Design	130	91
Data Analysis	134	123
CSV / Spreadsheet Cleanup	136	133
ETL Scripting	137	127
JSON Extraction	131	131
Bulk Data Labeling	129	129
OCR / Document Parsing	134	85
Table Extraction from PDFs	134	85
Long-Document Summarization	149	137
Short-Form Summarization	127	123
Blog Post Writing	130	121

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