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Claude Sonnet 4.5 vs GPT-5

Compare Claude Sonnet 4.5 by Anthropic against GPT-5 by OpenAI, in 53 community votes, claude sonnet 4.5 wins 64% of head-to-head duels, context windows of 200K vs 400K, tested across 37 shared challenges. Updated April 2026.

Which is better, Claude Sonnet 4.5 or GPT-5?

Claude Sonnet 4.5 is the better choice overall, winning 64% of 53 blind community votes on Rival. Claude Sonnet 4.5 costs $3/M input tokens vs $1.25/M for GPT-5. Context windows: 200K vs 400K tokens. Compare their real outputs side by side below.

Key Differences Between Claude Sonnet 4.5 and GPT-5

Claude Sonnet 4.5 is made by anthropic while GPT-5 is from openai. Claude Sonnet 4.5 has a 200K token context window compared to GPT-5's 400K. On pricing, Claude Sonnet 4.5 costs $3/M input tokens vs $1.25/M for GPT-5. In community voting, In 53 community votes, Claude Sonnet 4.5 wins 64% of head-to-head duels.

In 53 community votes, Claude Sonnet 4.5 wins 64% of head-to-head duels. Claude Sonnet 4.5 leads in Web Design, Reasoning, while GPT-5 leads in Image Generation, Conversation. Based on blind community voting from the Rival open dataset of 53+ human preference judgments for this pair.

Web Design: Claude Sonnet 4.5 wins 74% of votes
Reasoning: Claude Sonnet 4.5 wins 89% of votes
Image Generation: GPT-5 wins 75% of votes
Conversation: GPT-5 wins 67% of votes
Our Verdict
Claude Sonnet 4.5
Claude Sonnet 4.5Winner
GPT-5
GPT-5Runner-up

Pick Claude Sonnet 4.5. In 53 blind votes, Claude Sonnet 4.5 wins 64% of the time. That's not luck.

Pick Claude Sonnet 4.5 for Reasoning, Web Design. Pick GPT-5 for Image Generation, Conversation.

Clear winner
Writing DNA

Style Comparison

Similarity
92%

Claude Sonnet 4.5 uses 45.2x more emoji

Claude Sonnet 4.5
GPT-5
64%Vocabulary65%
94wSentence Length13w
0.48Hedging0.20
4.9Bold0.2
8.0Lists4.6
0.45Emoji0.00
1.91Headings0.16
0.07Transitions0.03
Based on 20 + 16 text responses
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Claude Sonnet 4.5GPT-5

279 AI models invented the same fake scientist.

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AI Hallucination Index 2026
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