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

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-08-13.

Google: Gemini 3.5 Flash Lite OpenAI: GPT-5.6 Terra Pro
Vendorgoogleopenai
Quality Score100100
Benchmark Score62.3-
Input Price$0.30/M$1.00/M
Output Price$2.50/M$6.00/M
Context Window1,048,5761,050,000
Max Output65,536128,000
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio✓-
Benchmark Scores
ai_index61.8-
ai_index_agentic44.8-
ai_index_coding81.4-

Who wins by task?

TaskGoogle: Gemini 3.5 Flash LiteOpenAI: GPT-5.6 Terra Pro
SQL Generation 161 133
Code Review 157 132
Code Completion 132 118
Code Refactoring 156 136
Bug Fixing 166 136
Unit Test Generation 146 124
Code Documentation 140 130
Regex Writing 131 118
CI/CD Pipelines 137 120
Frontend Component Design 139 122
Data Analysis 157 124
CSV / Spreadsheet Cleanup 149 133
ETL Scripting 147 128
JSON Extraction 145 122
Bulk Data Labeling 133 119
OCR / Document Parsing 143 131
Table Extraction from PDFs 143 131
Long-Document Summarization 153 137
Short-Form Summarization 129 114
Blog Post Writing 135 121

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

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