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OpenAI: GPT-5.6 Luna (batch) vs SpaceXAI: Grok Build 0.1

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-08-13.

OpenAI: GPT-5.6 Luna (batch) SpaceXAI: Grok Build 0.1
Vendoropenaix-ai
Quality Score100100
Benchmark Score88.2-
Input Price$0.10/M$1.00/M
Output Price$0.60/M$2.00/M
Context Window1,050,000256,000
Max Output128,000-
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio--
Benchmark Scores
ai_index86.3-
ai_index_agentic77.4-
ai_index_coding100.0-

Who wins by task?

TaskOpenAI: GPT-5.6 Luna (batch)SpaceXAI: Grok Build 0.1
SQL Generation 172 130
Code Review 167 126
Code Completion 133 116
Code Refactoring 164 127
Bug Fixing 180 130
Unit Test Generation 154 121
Code Documentation 143 125
Regex Writing 137 119
CI/CD Pipelines 144 117
Frontend Component Design 146 122
Data Analysis 171 124
CSV / Spreadsheet Cleanup 154 127
ETL Scripting 154 122
JSON Extraction 149 123
Bulk Data Labeling 135 121
OCR / Document Parsing 146 128
Table Extraction from PDFs 146 128
Long-Document Summarization 160 129
Short-Form Summarization 132 115
Blog Post Writing 140 118

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

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