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
Claude Opus 4
OpenAI o4-mini
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
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OpenAI o4-miniClaude Opus 4

279 AI models invented the same fake scientist.

We read every word. 250 models. 2.14 million words. This is what we found.

AI Hallucination Index 2026
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