head-to-head

OpenAI: GPT-5.6 Luna vs Anthropic: Claude Sonnet Latest

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

	OpenAI: GPT-5.6 Luna	Anthropic: Claude Sonnet Latest
Vendor	openai	~anthropic
Quality Score	100	100
Benchmark Score	62.3	-
Input Price	$0.20/M	$2.00/M
Output Price	$1.20/M	$10.00/M
Context Window	1,050,000	1,000,000
Max Output	128,000	128,000
Tool Calling	✓	✓
Structured Output	✓	✓
Reasoning Mode	✓	✓
Vision	✓	✓
Audio	-	-
Benchmark Scores
ai_index	61.6	-

Who wins by task?

Task	OpenAI: GPT-5.6 Luna	Anthropic: Claude Sonnet Latest
SQL Generation	141	132
Code Review	143	132
Code Completion	133	117
Code Refactoring	145	136
Bug Fixing	147	136
Unit Test Generation	131	124
Code Documentation	137	129
Regex Writing	125	117
CI/CD Pipelines	127	120
Frontend Component Design	129	122
Data Analysis	133	124
CSV / Spreadsheet Cleanup	136	132
ETL Scripting	136	128
JSON Extraction	131	121
Bulk Data Labeling	129	118
OCR / Document Parsing	134	131
Table Extraction from PDFs	134	131
Long-Document Summarization	147	136
Short-Form Summarization	126	113
Blog Post Writing	129	120

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