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Z.ai: GLM 5.3 Flash vs xAI: Grok Latest

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

Z.ai: GLM 5.3 Flash xAI: Grok Latest
Vendorz-ai~x-ai
Quality Score100100
Benchmark Score97.410.6
Input Price$0.07/M$2.00/M
Output Price$0.25/M$6.00/M
Context Window1,310,720500,000
Max Output131,072450,000
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio--
Benchmark Scores
ai_index94.812.0
ai_index_agentic96.0-
ai_index_coding100.0-

Who wins by task?

TaskZ.ai: GLM 5.3 FlashxAI: Grok Latest
SQL Generation 175 134
Code Review 170 134
Code Completion 133 118
Code Refactoring 166 137
Bug Fixing 186 138
Unit Test Generation 157 125
Code Documentation 145 131
Regex Writing 139 119
CI/CD Pipelines 147 121
Frontend Component Design 149 123
Data Analysis 176 125
CSV / Spreadsheet Cleanup 155 133
ETL Scripting 157 129
JSON Extraction 149 122
Bulk Data Labeling 135 119
OCR / Document Parsing 147 131
Table Extraction from PDFs 147 131
Long-Document Summarization 162 139
Short-Form Summarization 133 115
Blog Post Writing 143 122

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

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