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Z.ai: GLM 5.3 Flash vs OpenAI: GPT-5.6 Terra

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

Z.ai: GLM 5.3 Flash OpenAI: GPT-5.6 Terra
Vendorz-aiopenai
Quality Score100100
Benchmark Score97.492.7
Input Price$0.07/M$2.00/M
Output Price$0.25/M$12.00/M
Context Window1,310,7201,050,000
Max Output131,072128,000
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio--
Benchmark Scores
ai_index94.893.3
ai_index_agentic96.082.8
ai_index_coding100.0100.0

Who wins by task?

TaskZ.ai: GLM 5.3 FlashOpenAI: GPT-5.6 Terra
SQL Generation 175 172
Code Review 170 169
Code Completion 133 119
Code Refactoring 166 165
Bug Fixing 186 183
Unit Test Generation 157 155
Code Documentation 145 142
Regex Writing 139 135
CI/CD Pipelines 147 146
Frontend Component Design 149 148
Data Analysis 176 173
CSV / Spreadsheet Cleanup 155 153
ETL Scripting 157 155
JSON Extraction 149 138
Bulk Data Labeling 135 123
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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