Claude Haiku 4.5
Nothing here. The model returned empty. We stared at it for a while.
Claude Haiku 4.5 vs OpenAI o4-mini
Compare Claude Haiku 4.5 by Anthropic against OpenAI o4-mini by OpenAI, in 3 community votes, claude haiku 4.5 wins 100% of head-to-head duels, tested across 35 shared challenges. Updated April 2026.
Which is better, Claude Haiku 4.5 or OpenAI o4-mini?
Claude Haiku 4.5 is the better choice overall, winning 100% of 3 blind community votes on Rival. Claude Haiku 4.5 costs $1/M input tokens vs $1.1/M for OpenAI o4-mini. Compare their real outputs side by side below.
Key Differences Between Claude Haiku 4.5 and OpenAI o4-mini
Claude Haiku 4.5 is made by anthropic while OpenAI o4-mini is from openai. On pricing, Claude Haiku 4.5 costs $1/M input tokens vs $1.1/M for OpenAI o4-mini. In community voting, In 3 community votes, Claude Haiku 4.5 wins 100% of head-to-head duels.
In 3 community votes, Claude Haiku 4.5 wins 100% of head-to-head duels. Based on blind community voting from the Rival open dataset of 3+ human preference judgments for this pair.
Our Verdict
Claude Haiku 4.5Winner
OpenAI o4-miniRunner-up
Pick Claude Haiku 4.5. In 3 blind votes, Claude Haiku 4.5 wins 100% of the time. That's not luck.
Clear winner
Writing DNA
Style Comparison
Similarity
83%
Claude Haiku 4.5 uses 513.9x more bold
Claude Haiku 4.5
OpenAI o4-mini
61%Vocabulary73%
47wSentence Length15w
0.64Hedging0.18
5.1Bold0.0
6.3Lists2.1
0.20Emoji0.00
2.46Headings0.00
0.17Transitions0.02
Based on 24 + 10 text responses
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279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
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