Claude Haiku 4.5 vs GPT-5.4 Nano
Compare Claude Haiku 4.5 by Anthropic against GPT-5.4 Nano by OpenAI, in 4 community votes, gpt-5.4 nano wins 75% of head-to-head duels, context windows of 200K vs 400K, tested across 53 shared challenges.
Image Generation: Claude Haiku 4.5 and GPT-5.4 Nano are tied
Our Verdict
GPT-5.4 NanoWinner
Claude Haiku 4.5Runner-up
Pick GPT-5.4 Nano. In 4 blind votes, GPT-5.4 Nano wins 75% of the time. That's not luck.
GPT-5.4 Nano is 4.0x cheaper per token — worth considering if cost matters.
Clear winner
API pricing
Cost per 1M tokens
Claude Haiku 4.5
Input
$1.00
Output
$5.00
GPT-5.4 Nano
Input
$0.20
5.0× cheaper
Output
$1.25
4.0× cheaper
GPT-5.4 Nano is cheaper on both — 5.0× input, 4.0× output
Writing DNA
Style Comparison
Similarity
66%
Claude Haiku 4.5 uses 20.4x more emoji
Claude Haiku 4.5
GPT-5.4 Nano
61%Vocabulary51%
47wSentence Length21w
0.64Hedging0.58
5.1Bold7.1
6.3Lists5.5
0.20Emoji0.01
2.46Headings1.39
0.17Transitions0.05
Based on 24 + 23 text responses
Research
What we learned reading every model
FAQ
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