Claude Opus 4.5 vs GPT-4o (Omni)
Compare Claude Opus 4.5 by Anthropic against GPT-4o (Omni) by OpenAI, tested across 54 shared challenges. Updated June 2026.
Which is better, Claude Opus 4.5 or GPT-4o (Omni)?
Claude Opus 4.5 and GPT-4o (Omni) are both competitive models. Compare their real outputs side by side below.
Key Differences Between Claude Opus 4.5 and GPT-4o (Omni)
Claude Opus 4.5 is made by anthropic while GPT-4o (Omni) is from openai.
Our Verdict
Claude Opus 4.5
GPT-4o (Omni)
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Too close to call
API pricing
Cost per 1M tokens
Claude Opus 4.5
Input
—
Output
—
GPT-4o (Omni)
Input
$2.50
Output
$10.00
Writing DNA
Style Comparison
Similarity
45%
Claude Opus 4.5 uses 6.0x more emoji
Claude Opus 4.5
GPT-4o (Omni)
64%Vocabulary54%
55wSentence Length18w
0.86Hedging0.72
5.8Bold7.3
4.5Lists5.6
0.15Emoji0.03
1.59Headings1.40
0.05Transitions0.26
Based on 24 + 24 text responses
Research
What we learned reading every model
FAQ
