picksbymodel Get API access →
head-to-head

OpenAI: GPT-5.6 Luna (batch) vs OpenAI: GPT-5.6 Terra

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-09-23.

OpenAI: GPT-5.6 Luna (batch) OpenAI: GPT-5.6 Terra
Vendoropenaiopenai
Quality Score100100
Benchmark Score62.371.1
Input Price$0.10/M$2.00/M
Output Price$0.60/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_index61.669.4

Who wins by task?

TaskOpenAI: GPT-5.6 Luna (batch)OpenAI: GPT-5.6 Terra
SQL Generation 141 140
Code Review 143 145
Code Completion 133 118
Code Refactoring 145 147
Bug Fixing 147 149
Unit Test Generation 131 132
Code Documentation 137 135
Regex Writing 126 124
CI/CD Pipelines 127 128
Frontend Component Design 129 130
Data Analysis 133 134
CSV / Spreadsheet Cleanup 136 135
ETL Scripting 136 137
JSON Extraction 131 121
Bulk Data Labeling 129 117
OCR / Document Parsing 134 134
Table Extraction from PDFs 134 134
Long-Document Summarization 147 147
Short-Form Summarization 126 116
Blog Post Writing 129 128

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

Related comparisons

Anthropic: Claude Opus 5 (batch) vs OpenAI: GPT-5.6 Luna (batch) Anthropic: Claude Opus 5 (batch) vs OpenAI: GPT-5.6 Terra ByteDance Seed: Seed-2.0-Code vs OpenAI: GPT-5.6 Luna (batch) ByteDance Seed: Seed-2.0-Code vs OpenAI: GPT-5.6 Terra ByteDance Seed: Seed 2.1 Turbo vs OpenAI: GPT-5.6 Luna (batch) ByteDance Seed: Seed 2.1 Turbo vs OpenAI: GPT-5.6 Terra DeepSeek: DeepSeek V4.1 Flash vs OpenAI: GPT-5.6 Luna (batch) DeepSeek: DeepSeek V4 Flash Vision Exp vs OpenAI: GPT-5.6 Luna (batch)

The Model Movers Report

One email every Friday, built from this site's own rankings: the current top five by benchmark score, every model released in the last seven days, and one note worked out from that week's numbers. You can unsubscribe from any issue with one click.