Claude Haiku 4.5 vs GPT-5 Codex
Compare Claude Haiku 4.5 by Anthropic against GPT-5 Codex by OpenAI, in 29 community votes, claude haiku 4.5 wins 75% of head-to-head duels, tested across 50 shared challenges.
Reasoning: Claude Haiku 4.5 wins 64% of votes
Image Generation: Claude Haiku 4.5 wins 75% of votes
Conversation: Claude Haiku 4.5 wins 100% of votes
Web Design: Claude Haiku 4.5 wins 100% of votes
Our Verdict
Claude Haiku 4.5Winner
GPT-5 CodexRunner-up
Pick Claude Haiku 4.5. In 29 blind votes, Claude Haiku 4.5 wins 75% of the time. That's not luck.
Claude Haiku 4.5 particularly excels in Conversation, Web Design, Image Generation.
Clear winner
API pricing
Cost per 1M tokens
Claude Haiku 4.5
Input
$1.00
Output
$5.00
GPT-5 Codex
Input
—
Output
—
Writing DNA
Style Comparison
Similarity
35%
Claude Haiku 4.5 uses 5.0x more headings
Claude Haiku 4.5
GPT-5 Codex
61%Vocabulary64%
47wSentence Length17w
0.64Hedging0.38
5.1Bold2.3
6.3Lists3.5
0.20Emoji0.15
2.46Headings0.49
0.17Transitions0.05
Based on 24 + 13 text responses
Research
What we learned reading every model
FAQ
