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Google: Gemini 3.8 Flash (batch) vs OpenAI: GPT-5.6 Luna Pro (batch)

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-09-04.

Google: Gemini 3.8 Flash (batch) OpenAI: GPT-5.6 Luna Pro (batch)
Vendorgoogleopenai
Quality Score100100
Benchmark Score93.4-
Input Price$0.38/M$0.10/M
Output Price$1.88/M$0.60/M
Context Window1,048,5761,050,000
Max Output65,536128,000
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio✓-
Benchmark Scores
ai_index96.8-
ai_index_agentic82.5-
ai_index_coding100.0-

Who wins by task?

TaskGoogle: Gemini 3.8 Flash (batch)OpenAI: GPT-5.6 Luna Pro (batch)
SQL Generation 173 133
Code Review 169 132
Code Completion 133 131
Code Refactoring 166 136
Bug Fixing 183 136
Unit Test Generation 156 124
Code Documentation 144 131
Regex Writing 138 119
CI/CD Pipelines 146 120
Frontend Component Design 148 122
Data Analysis 173 124
CSV / Spreadsheet Cleanup 155 133
ETL Scripting 156 128
JSON Extraction 149 131
Bulk Data Labeling 135 129
OCR / Document Parsing 147 131
Table Extraction from PDFs 147 131
Long-Document Summarization 162 137
Short-Form Summarization 132 123
Blog Post Writing 142 121

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

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