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OpenAI: GPT-5.6 Luna Pro (batch) vs Anthropic: Claude Opus 4.8 (batch)

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

OpenAI: GPT-5.6 Luna Pro (batch) Anthropic: Claude Opus 4.8 (batch)
Vendoropenaianthropic
Quality Score100100
Benchmark Score-94.7
Input Price$0.10/M$2.50/M
Output Price$0.60/M$12.50/M
Context Window1,050,0001,000,000
Max Output128,000128,000
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio--
Benchmark Scores
ai_index-94.6
ai_index_agentic-81.5
ai_index_coding-100.0
eqbench-83.3

Who wins by task?

TaskOpenAI: GPT-5.6 Luna Pro (batch)Anthropic: Claude Opus 4.8 (batch)
SQL Generation 133 178
Code Review 132 179
Code Completion 131 121
Code Refactoring 136 176
Bug Fixing 136 193
Unit Test Generation 124 161
Code Documentation 131 148
Regex Writing 119 138
CI/CD Pipelines 120 151
Frontend Component Design 122 151
Data Analysis 124 178
CSV / Spreadsheet Cleanup 133 158
ETL Scripting 128 164
JSON Extraction 131 138
Bulk Data Labeling 129 123
OCR / Document Parsing 131 149
Table Extraction from PDFs 131 149
Long-Document Summarization 137 171
Short-Form Summarization 123 123
Blog Post Writing 121 146

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

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