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Google: Gemini 3.8 Flash vs OpenAI: GPT-5.6 Luna

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

Google: Gemini 3.8 Flash OpenAI: GPT-5.6 Luna
Vendorgoogleopenai
Quality Score100100
Benchmark Score93.487.6
Input Price$0.75/M$0.20/M
Output Price$3.75/M$1.20/M
Context Window1,048,5761,050,000
Max Output65,536128,000
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio✓-
Benchmark Scores
ai_index96.886.3
ai_index_agentic82.577.4
ai_index_coding100.0100.0

Who wins by task?

TaskGoogle: Gemini 3.8 FlashOpenAI: GPT-5.6 Luna
SQL Generation 173 172
Code Review 169 167
Code Completion 133 133
Code Refactoring 166 164
Bug Fixing 183 180
Unit Test Generation 156 154
Code Documentation 144 143
Regex Writing 137 137
CI/CD Pipelines 146 144
Frontend Component Design 148 146
Data Analysis 173 171
CSV / Spreadsheet Cleanup 154 154
ETL Scripting 156 154
JSON Extraction 148 149
Bulk Data Labeling 134 135
OCR / Document Parsing 147 146
Table Extraction from PDFs 147 146
Long-Document Summarization 162 160
Blog Post Writing 142 140

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

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