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OpenAI: GPT-5.6 Luna (batch) vs Anthropic: Claude Sonnet 5

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-09-23.

OpenAI: GPT-5.6 Luna (batch) Anthropic: Claude Sonnet 5
Vendoropenaianthropic
Quality Score100100
Benchmark Score62.363.9
Input Price$0.10/M$2.00/M
Output Price$0.60/M$10.00/M
Context Window1,050,0001,000,000
Max Output128,000128,000
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio--
Benchmark Scores
ai_index61.663.0

Who wins by task?

TaskOpenAI: GPT-5.6 Luna (batch)Anthropic: Claude Sonnet 5
SQL Generation 141 140
Code Review 143 144
Code Completion 133 118
Code Refactoring 145 146
Bug Fixing 147 148
Unit Test Generation 131 131
Code Documentation 137 135
Regex Writing 126 123
CI/CD Pipelines 127 127
Frontend Component Design 129 129
Data Analysis 133 133
CSV / Spreadsheet Cleanup 136 135
ETL Scripting 136 136
JSON Extraction 131 121
Bulk Data Labeling 129 118
OCR / Document Parsing 134 134
Table Extraction from PDFs 134 134
Long-Document Summarization 147 146
Short-Form Summarization 126 116
Blog Post Writing 129 128

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

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