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Anthropic Claude Sonnet Latest vs OpenAI: GPT-5.3-Codex

Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-05-12.

Anthropic Claude Sonnet Latest OpenAI: GPT-5.3-Codex
Vendor~anthropicopenai
Quality Score100100
Input Price$3.00/M$1.75/M
Output Price$15.00/M$14.00/M
Context Window1,000,000400,000
Max Output128,000128,000
Tool Calling✓✓
Structured Output✓✓
Reasoning Mode✓✓
Vision✓✓
Audio--

Who wins by task?

TaskAnthropic Claude Sonnet LatestOpenAI: GPT-5.3-Codex
SQL Generation 132 132
Code Completion 116 116
Code Documentation 128 128
Regex Writing 116 116
CSV / Spreadsheet Cleanup 132 132
JSON Extraction 120 120
Bulk Data Labeling 116 117
Long-Document Summarization 136 136
Short-Form Summarization 112 112
Blog Post Writing 120 120

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

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