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

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-08-27.

Z.ai: GLM 5.3 Flash Anthropic: Claude Sonnet 5
Vendorz-aianthropic
Quality Score100100
Benchmark Score97.491.6
Input Price$0.07/M$2.00/M
Output Price$0.25/M$10.00/M
Context Window1,310,7201,000,000
Max Output131,072128,000
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio--
Benchmark Scores
ai_index94.891.2
ai_index_agentic96.082.0
ai_index_coding100.0100.0

Who wins by task?

TaskZ.ai: GLM 5.3 FlashAnthropic: Claude Sonnet 5
SQL Generation 175 172
Code Review 170 168
Code Completion 133 119
Code Refactoring 166 165
Bug Fixing 186 182
Unit Test Generation 157 155
Code Documentation 145 142
Regex Writing 139 135
CI/CD Pipelines 147 145
Frontend Component Design 149 147
Data Analysis 176 172
CSV / Spreadsheet Cleanup 155 153
ETL Scripting 157 155
JSON Extraction 149 139
Bulk Data Labeling 135 124
OCR / Document Parsing 147 147
Table Extraction from PDFs 147 147
Long-Document Summarization 162 160
Short-Form Summarization 133 122
Blog Post Writing 143 140

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

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