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

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 Sol
Vendorz-aiopenai
Quality Score100100
Benchmark Score97.499.3
Input Price$0.07/M$2.00/M
Output Price$0.25/M$10.00/M
Context Window1,310,7201,050,000
Max Output131,072128,000
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio--
Benchmark Scores
ai_index94.8100.0
ai_index_agentic96.095.3
ai_index_coding100.0100.0

Who wins by task?

TaskZ.ai: GLM 5.3 FlashOpenAI: GPT-5.6 Sol
SQL Generation 175 175
Code Review 170 171
Code Completion 133 119
Code Refactoring 166 167
Bug Fixing 186 187
Unit Test Generation 157 157
Code Documentation 145 143
Regex Writing 139 137
CI/CD Pipelines 147 147
Frontend Component Design 149 149
Data Analysis 176 177
CSV / Spreadsheet Cleanup 155 154
ETL Scripting 157 157
JSON Extraction 149 139
Bulk Data Labeling 135 124
OCR / Document Parsing 147 147
Table Extraction from PDFs 147 147
Long-Document Summarization 162 162
Short-Form Summarization 133 123
Blog Post Writing 143 142

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

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