Claude Opus 4.5 vs GPT-5.1-Codex
Compare Claude Opus 4.5 by Anthropic against GPT-5.1-Codex by OpenAI, in 36 community votes, claude opus 4.5 wins 77% of head-to-head duels, tested across 53 shared challenges.
Web Design: Claude Opus 4.5 wins 61% of votes
Image Generation: Claude Opus 4.5 wins 100% of votes
Our Verdict
Claude Opus 4.5Winner
GPT-5.1-CodexRunner-up
Pick Claude Opus 4.5. In 36 blind votes, Claude Opus 4.5 wins 77% of the time. That's not luck.
Claude Opus 4.5 particularly excels in Image Generation, Web Design.
Clear winner
API pricing
Cost per 1M tokens
Claude Opus 4.5
Input
—
Output
—
GPT-5.1-Codex
Input
$1.25
Output
$10.00
Writing DNA
Style Comparison
Similarity
46%
Claude Opus 4.5 uses 15.2x more emoji
Claude Opus 4.5
GPT-5.1-Codex
64%Vocabulary70%
55wSentence Length17w
0.86Hedging0.39
5.8Bold3.4
4.5Lists3.5
0.15Emoji0.00
1.59Headings0.50
0.05Transitions0.38
Based on 24 + 14 text responses
Research
What we learned reading every model
FAQ
