OpenAI o4-mini
Sally has exactly one sister. Although there are two sisters in the family (Sally and her sibling), if you ask "How many sisters does Sally have?" the answer is 1.
OpenAI o4-mini vs Claude Opus 4
Compare OpenAI o4-mini by OpenAI against Claude Opus 4 by Anthropic, tested across 25 shared challenges. Updated April 2026.
Which is better, OpenAI o4-mini or Claude Opus 4?
OpenAI o4-mini and Claude Opus 4 are both competitive models. OpenAI o4-mini costs $1.1/M input tokens vs $15/M for Claude Opus 4. Compare their real outputs side by side below.
Key Differences Between OpenAI o4-mini and Claude Opus 4
OpenAI o4-mini is made by openai while Claude Opus 4 is from anthropic. On pricing, OpenAI o4-mini costs $1.1/M input tokens vs $15/M for Claude Opus 4.
Our Verdict
Claude Opus 4
OpenAI o4-miniRunner-up
No community votes yet. On paper, Claude Opus 4 has the edge — bigger model tier, newer, bigger context window.
OpenAI o4-mini is 17x cheaper per token — worth considering if cost matters.
Too close to call
Writing DNA
Style Comparison
Similarity
83%
Claude Opus 4 uses 444.0x more bold
OpenAI o4-mini
Claude Opus 4
73%Vocabulary64%
15wSentence Length62w
0.18Hedging0.52
0.0Bold4.4
2.1Lists9.1
0.00Emoji0.11
0.00Headings1.87
0.02Transitions0.27
Based on 10 + 16 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.
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