head-to-head

Z.ai: GLM 5.3 Flash (batch) vs Anthropic: Claude Sonnet 5 (batch)

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

	Z.ai: GLM 5.3 Flash (batch)	Anthropic: Claude Sonnet 5 (batch)
Vendor	z-ai	anthropic
Quality Score	100	100
Benchmark Score	70.6	63.9
Input Price	$0.06/M	$1.00/M
Output Price	$0.20/M	$5.00/M
Context Window	1,048,576	1,000,000
Max Output	131,072	128,000
Tool Calling	✓	✓
Structured Output	✓	✓
Reasoning Mode	✓	✓
Vision	✓	✓
Audio	-	-
Benchmark Scores
ai_index	69.0	63.0

Who wins by task?

Task	Z.ai: GLM 5.3 Flash (batch)	Anthropic: Claude Sonnet 5 (batch)
SQL Generation	142	141
Code Review	145	144
Code Completion	133	120
Code Refactoring	147	146
Bug Fixing	149	148
Unit Test Generation	132	131
Code Documentation	138	136
Regex Writing	126	125
CI/CD Pipelines	128	127
Frontend Component Design	130	129
Data Analysis	134	133
CSV / Spreadsheet Cleanup	136	135
ETL Scripting	137	136
JSON Extraction	131	122
Bulk Data Labeling	129	120
OCR / Document Parsing	134	134
Table Extraction from PDFs	134	134
Long-Document Summarization	149	147
Short-Form Summarization	127	118
Blog Post Writing	130	129

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