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

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

OpenAI: GPT-5.6 Terra Anthropic: Claude Sonnet 5
Vendoropenaianthropic
Quality Score100100
Benchmark Score92.791.6
Input Price$1.00/M$2.00/M
Output Price$6.00/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_index93.391.2
ai_index_agentic82.882.0
ai_index_coding100.0100.0

Who wins by task?

TaskOpenAI: GPT-5.6 TerraAnthropic: Claude Sonnet 5
SQL Generation 173 172
Code Review 169 168
Code Completion 120 119
Code Refactoring 165 165
Bug Fixing 183 182
Unit Test Generation 155 155
Code Documentation 143 142
Regex Writing 136 135
CI/CD Pipelines 146 145
Frontend Component Design 148 147
Data Analysis 173 172
CSV / Spreadsheet Cleanup 154 153
ETL Scripting 155 155
JSON Extraction 140 139
Bulk Data Labeling 125 124
OCR / Document Parsing 147 147
Table Extraction from PDFs 147 147
Long-Document Summarization 161 160
Short-Form Summarization 123 122
Blog Post Writing 141 140

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

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