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xAI: Grok 4.3 vs OpenAI: GPT-5.5 (batch)

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-07-30.

xAI: Grok 4.3 OpenAI: GPT-5.5 (batch)
Vendorx-aiopenai
Quality Score100100
Benchmark Score58.092.6
Input Price$1.25/M$2.50/M
Output Price$2.50/M$15.00/M
Context Window1,000,0001,050,000
Max Output-128,000
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio--
Benchmark Scores
ai_index62.090.5
ai_index_agentic39.874.0
ai_index_coding69.7100.0
eqbench-82.4

Who wins by task?

TaskxAI: Grok 4.3OpenAI: GPT-5.5 (batch)
SQL Generation 158 176
Code Review 155 177
Code Completion 120 120
Code Refactoring 155 175
Bug Fixing 164 190
Unit Test Generation 144 160
Code Documentation 139 147
Regex Writing 130 137
CI/CD Pipelines 136 150
Frontend Component Design 138 150
Data Analysis 153 175
CSV / Spreadsheet Cleanup 147 158
ETL Scripting 145 163
JSON Extraction 134 137
Bulk Data Labeling 124 122
OCR / Document Parsing 141 149
Table Extraction from PDFs 141 149
Long-Document Summarization 152 169
Short-Form Summarization 120 122
Blog Post Writing 134 145

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

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