Claude Opus 4.5
Nothing here. The model returned empty. We stared at it for a while.
Claude Opus 4.5 vs GPT-4o mini
Compare Claude Opus 4.5 by Anthropic against GPT-4o mini by OpenAI, tested across 38 shared challenges. Updated April 2026.
Which is better, Claude Opus 4.5 or GPT-4o mini?
Claude Opus 4.5 and GPT-4o mini are both competitive models. Compare their real outputs side by side below.
Key Differences Between Claude Opus 4.5 and GPT-4o mini
Claude Opus 4.5 is made by anthropic while GPT-4o mini is from openai.
Our Verdict
Claude Opus 4.5
GPT-4o miniRunner-up
No community votes yet. On paper, Claude Opus 4.5 has the edge — bigger model tier, newer.
Too close to call
Writing DNA
Style Comparison
Similarity
94%
Claude Opus 4.5 uses 15.2x more emoji
Claude Opus 4.5
GPT-4o mini
64%Vocabulary54%
55wSentence Length18w
0.86Hedging0.84
5.8Bold3.8
4.5Lists3.3
0.15Emoji0.00
1.59Headings1.03
0.05Transitions0.23
Based on 24 + 22 text responses
vsAsk them anything yourself
Some models write identically. You are paying for the brand.
178 models fingerprinted across 32 writing dimensions. Free research.
Model Similarity Index
185x
price gap between models that write identically
178
models
12
clone pairs
32
dimensions
Devstral M / S
95.7%
Qwen3 Coder / Flash
95.6%
GPT-5.4 / Mini
93.3%
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
Free preview13 of 58 slides
FAQ