Claude Sonnet 4.5 vs GPT-5 Pro

Compare Claude Sonnet 4.5 by Anthropic against GPT-5 Pro by OpenAI, in 17 community votes, claude sonnet 4.5 wins 63% of head-to-head duels, context windows of 200K vs 400K, tested across 36 shared challenges. Updated February 2026.

In 17 community votes, Claude Sonnet 4.5 wins 63% of head-to-head duels. Claude Sonnet 4.5 leads in Web Design, Analysis, Conversation, while GPT-5 Pro leads in Reasoning, Image Generation. Based on blind community voting from the RIVAL open dataset of 17+ human preference judgments for this pair.

Reasoning: GPT-5 Pro wins 60% of votes
Web Design: Claude Sonnet 4.5 wins 75% of votes
Image Generation: GPT-5 Pro wins 67% of votes
Analysis: Claude Sonnet 4.5 wins 100% of votes
Conversation: Claude Sonnet 4.5 wins 100% of votes
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