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Google: Gemini 3.5 Flash Lite vs OpenAI: GPT-5.6 Terra

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-09-07.

Google: Gemini 3.5 Flash Lite OpenAI: GPT-5.6 Terra
Vendorgoogleopenai
Quality Score100100
Benchmark Score51.585.5
Input Price$0.30/M$2.00/M
Output Price$2.50/M$12.00/M
Context Window1,048,5761,050,000
Max Output65,536128,000
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio✓-
Benchmark Scores
ai_index45.577.2
ai_index_agentic26.572.5
ai_index_coding81.4100.0

Who wins by task?

TaskGoogle: Gemini 3.5 Flash LiteOpenAI: GPT-5.6 Terra
SQL Generation 156 169
Code Review 152 164
Code Completion 132 118
Code Refactoring 152 162
Bug Fixing 160 177
Unit Test Generation 143 153
Code Documentation 138 140
Regex Writing 128 133
CI/CD Pipelines 134 143
Frontend Component Design 136 145
Data Analysis 150 168
CSV / Spreadsheet Cleanup 148 152
ETL Scripting 143 152
JSON Extraction 144 138
Bulk Data Labeling 133 123
OCR / Document Parsing 141 146
Table Extraction from PDFs 141 146
Long-Document Summarization 149 157
Short-Form Summarization 128 121
Blog Post Writing 132 138

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

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