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OpenAI: GPT-5.6 Luna vs OpenAI: GPT-5.6 Terra

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-08-25.

OpenAI: GPT-5.6 Luna OpenAI: GPT-5.6 Terra
Vendoropenaiopenai
Quality Score100100
Benchmark Score88.292.7
Input Price$0.20/M$2.00/M
Output Price$1.20/M$12.00/M
Context Window1,050,0001,050,000
Max Output128,000128,000
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio--
Benchmark Scores
ai_index86.393.3
ai_index_agentic77.482.8
ai_index_coding100.0100.0

Who wins by task?

TaskOpenAI: GPT-5.6 LunaOpenAI: GPT-5.6 Terra
SQL Generation 172 172
Code Review 167 169
Code Completion 133 119
Code Refactoring 164 165
Bug Fixing 180 183
Unit Test Generation 154 155
Code Documentation 143 142
Regex Writing 137 135
CI/CD Pipelines 144 146
Frontend Component Design 146 148
Data Analysis 171 173
CSV / Spreadsheet Cleanup 154 153
ETL Scripting 154 155
JSON Extraction 149 138
Bulk Data Labeling 135 123
OCR / Document Parsing 146 147
Table Extraction from PDFs 146 147
Long-Document Summarization 160 160
Short-Form Summarization 132 122
Blog Post Writing 140 140

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

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