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xAI: Grok 4.3 vs OpenAI: GPT-5.4 Nano

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-06-17.

xAI: Grok 4.3 OpenAI: GPT-5.4 Nano
Vendorx-aiopenai
Quality Score100100
Benchmark Score75.070.5
Input Price$1.25/M$0.20/M
Output Price$2.50/M$1.25/M
Context Window1,000,000400,000
Max Output-128,000
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio--
Benchmark Scores
ai_index62.063.1
ai_index_agentic100.078.5
ai_index_coding67.772.4

Who wins by task?

TaskxAI: Grok 4.3OpenAI: GPT-5.4 Nano
SQL Generation 166 164
Code Review 161 159
Code Completion 120 133
Code Refactoring 159 158
Bug Fixing 176 173
Unit Test Generation 148 148
Regex Writing 134 133
CI/CD Pipelines 140 139
Frontend Component Design 142 141
Data Analysis 166 163
CSV / Spreadsheet Cleanup 149 149
ETL Scripting 149 148
JSON Extraction 136 144
Bulk Data Labeling 125 134
OCR / Document Parsing 142 143
Table Extraction from PDFs 142 143
Long-Document Summarization 156 155
Short-Form Summarization 122 130
Blog Post Writing 137 137

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

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