Claude Haiku 4.5 vs GPT-5 Pro
Compare Claude Haiku 4.5 by Anthropic against GPT-5 Pro by OpenAI, in 22 community votes, claude haiku 4.5 wins 79% of head-to-head duels, context windows of 200K vs 400K, tested across 42 shared challenges.
Reasoning: Claude Haiku 4.5 wins 83% of votes
Web Design: Claude Haiku 4.5 wins 100% of votes
Conversation: Claude Haiku 4.5 wins 75% of votes
Analysis: Claude Haiku 4.5 and GPT-5 Pro are tied
Image Generation: Claude Haiku 4.5 and GPT-5 Pro are tied
Our Verdict
Claude Haiku 4.5Winner
GPT-5 ProRunner-up
Pick Claude Haiku 4.5. In 22 blind votes, Claude Haiku 4.5 wins 79% of the time. That's not luck.
Claude Haiku 4.5 particularly excels in Web Design, Reasoning, Conversation. Claude Haiku 4.5 is 24x cheaper per token — worth considering if cost matters.
Clear winner
API pricing
Cost per 1M tokens
Claude Haiku 4.5
Input
$1.00
15× cheaper
Output
$5.00
24× cheaper
GPT-5 Pro
Input
$15.00
Output
$120.00
Claude Haiku 4.5 is cheaper on both — 15× input, 24× output
Writing DNA
Style Comparison
Similarity
37%
Claude Haiku 4.5 uses 513.9x more bold
Claude Haiku 4.5
GPT-5 Pro
61%Vocabulary65%
47wSentence Length15w
0.64Hedging0.32
5.1Bold0.0
6.3Lists2.9
0.20Emoji0.00
2.46Headings0.00
0.17Transitions0.01
Based on 24 + 11 text responses
Research
What we learned reading every model
FAQ
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