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

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 Luna
Vendorz-aiopenai
Quality Score100100
Benchmark Score97.488.2
Input Price$0.07/M$0.20/M
Output Price$0.25/M$1.20/M
Context Window1,310,7201,050,000
Max Output131,072128,000
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio--
Benchmark Scores
ai_index94.886.3
ai_index_agentic96.077.4
ai_index_coding100.0100.0

Who wins by task?

TaskZ.ai: GLM 5.3 FlashOpenAI: GPT-5.6 Luna
SQL Generation 175 172
Code Review 170 167
Code Completion 133 133
Code Refactoring 166 164
Bug Fixing 186 180
Unit Test Generation 157 154
Code Documentation 145 143
Regex Writing 139 137
CI/CD Pipelines 147 144
Frontend Component Design 149 146
Data Analysis 176 171
CSV / Spreadsheet Cleanup 155 154
ETL Scripting 157 154
JSON Extraction 149 149
Bulk Data Labeling 135 135
OCR / Document Parsing 147 146
Table Extraction from PDFs 147 146
Long-Document Summarization 162 160
Short-Form Summarization 133 132
Blog Post Writing 143 140

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

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