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OpenAI: GPT-5.6 Luna (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 (batch) Anthropic: Claude Opus 4.8 (batch)
Vendoropenaianthropic
Quality Score100100
Benchmark Score88.294.7
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_index86.394.6
ai_index_agentic77.481.5
ai_index_coding100.0100.0
eqbench-83.3

Who wins by task?

TaskOpenAI: GPT-5.6 Luna (batch)Anthropic: Claude Opus 4.8 (batch)
SQL Generation 172 178
Code Review 167 179
Code Completion 133 121
Code Refactoring 164 176
Bug Fixing 180 193
Unit Test Generation 154 161
Code Documentation 143 148
Regex Writing 137 138
CI/CD Pipelines 144 151
Frontend Component Design 146 151
Data Analysis 171 178
CSV / Spreadsheet Cleanup 154 158
ETL Scripting 154 164
JSON Extraction 149 138
Bulk Data Labeling 135 123
OCR / Document Parsing 146 149
Table Extraction from PDFs 146 149
Long-Document Summarization 160 171
Short-Form Summarization 132 123
Blog Post Writing 140 146

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

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