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OpenAI: GPT-5.6 Luna Pro vs Google Gemini Flash Latest

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-07-10.

OpenAI: GPT-5.6 Luna Pro Google Gemini Flash Latest
Vendoropenai~google
Quality Score100100
Input Price$1.00/M$1.50/M
Output Price$6.00/M$9.00/M
Context Window1,050,0001,048,576
Max Output128,00065,536
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio-✓

Who wins by task?

TaskOpenAI: GPT-5.6 Luna ProGoogle Gemini Flash Latest
SQL Generation 133 132
Code Completion 118 117
Code Documentation 130 129
Regex Writing 118 117
CSV / Spreadsheet Cleanup 133 132
JSON Extraction 122 121
Bulk Data Labeling 119 118
Long-Document Summarization 137 136
Short-Form Summarization 114 113
Blog Post Writing 121 121

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

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