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

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 Terra
Vendorgoogleopenai
Quality Score100100
Benchmark Score93.492.1
Input Price$0.38/M$2.00/M
Output Price$1.88/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_index96.893.3
ai_index_agentic82.582.8
ai_index_coding100.0100.0

Who wins by task?

TaskGoogle: Gemini 3.8 Flash (batch)OpenAI: GPT-5.6 Terra
SQL Generation 173 172
Code Review 169 169
Code Completion 133 119
Code Refactoring 166 165
Bug Fixing 183 183
Unit Test Generation 156 155
Code Documentation 144 142
Regex Writing 138 135
CI/CD Pipelines 146 146
Frontend Component Design 148 148
Data Analysis 173 173
CSV / Spreadsheet Cleanup 155 153
ETL Scripting 156 155
JSON Extraction 149 138
Bulk Data Labeling 135 123
OCR / Document Parsing 147 147
Table Extraction from PDFs 147 147
Long-Document Summarization 162 160
Short-Form Summarization 132 122
Blog Post Writing 142 140

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

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