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OpenAI: GPT-5.6 Terra Pro vs Anthropic: Claude Sonnet 5

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

OpenAI: GPT-5.6 Terra Pro Anthropic: Claude Sonnet 5
Vendoropenaianthropic
Quality Score100100
Benchmark Score-91.6
Input Price$2.00/M$2.00/M
Output Price$12.00/M$10.00/M
Context Window1,050,0001,000,000
Max Output128,000128,000
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio--
Benchmark Scores
ai_index-91.2
ai_index_agentic-82.0
ai_index_coding-100.0

Who wins by task?

TaskOpenAI: GPT-5.6 Terra ProAnthropic: Claude Sonnet 5
SQL Generation 132 172
Code Review 132 168
Code Completion 117 119
Code Refactoring 136 165
Bug Fixing 136 182
Unit Test Generation 124 155
Code Documentation 129 142
Regex Writing 117 135
CI/CD Pipelines 120 145
Frontend Component Design 122 147
Data Analysis 124 172
CSV / Spreadsheet Cleanup 132 153
ETL Scripting 128 155
JSON Extraction 121 139
Bulk Data Labeling 117 124
OCR / Document Parsing 131 147
Table Extraction from PDFs 131 147
Long-Document Summarization 136 160
Short-Form Summarization 113 122
Blog Post Writing 120 140

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

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