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ByteDance Seed: Seed 2.1 Turbo vs OpenAI: GPT-5.6 Luna (batch)

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

ByteDance Seed: Seed 2.1 Turbo OpenAI: GPT-5.6 Luna (batch)
Vendorbytedance-seedopenai
Quality Score100100
Benchmark Score-88.2
Input Price$0.50/M$0.10/M
Output Price$2.50/M$0.60/M
Context Window262,1441,050,000
Max Output262,144128,000
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio--
Benchmark Scores
ai_index-86.3
ai_index_agentic-77.4
ai_index_coding-100.0

Who wins by task?

TaskByteDance Seed: Seed 2.1 TurboOpenAI: GPT-5.6 Luna (batch)
SQL Generation 130 172
Code Review 126 167
Code Completion 128 133
Code Refactoring 127 164
Bug Fixing 130 180
Unit Test Generation 121 154
Code Documentation 125 143
Regex Writing 119 137
CI/CD Pipelines 117 144
Frontend Component Design 122 146
Data Analysis 124 171
CSV / Spreadsheet Cleanup 128 154
ETL Scripting 122 154
JSON Extraction 131 149
Bulk Data Labeling 129 135
OCR / Document Parsing 128 146
Table Extraction from PDFs 128 146
Long-Document Summarization 129 160
Short-Form Summarization 123 132
Blog Post Writing 118 140

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

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