Claude Opus 4
Nothing here. The model returned empty. We stared at it for a while.
Claude Opus 4 vs o3 Mini
Compare Claude Opus 4 by Anthropic against o3 Mini by OpenAI, context windows of 200K vs 64K, tested across 35 shared challenges. Updated April 2026.
Which is better, Claude Opus 4 or o3 Mini?
Claude Opus 4 and o3 Mini are both competitive models. Claude Opus 4 costs $15/M input tokens vs $1.1/M for o3 Mini. Context windows: 200K vs 64K tokens. Compare their real outputs side by side below.
Key Differences Between Claude Opus 4 and o3 Mini
Claude Opus 4 is made by anthropic while o3 Mini is from openai. Claude Opus 4 has a 200K token context window compared to o3 Mini's 64K. On pricing, Claude Opus 4 costs $15/M input tokens vs $1.1/M for o3 Mini.
Our Verdict
Claude Opus 4
o3 MiniRunner-up
No community votes yet. On paper, Claude Opus 4 has the edge — bigger model tier, newer, bigger context window.
o3 Mini is 17x cheaper per token — worth considering if cost matters.
Slight edge
Writing DNA
Style Comparison
Similarity
87%
Claude Opus 4 uses 11.2x more emoji
Claude Opus 4
o3 Mini
64%Vocabulary65%
62wSentence Length17w
0.52Hedging0.74
4.4Bold3.9
9.1Lists1.7
0.11Emoji0.00
1.87Headings0.47
0.27Transitions0.38
Based on 16 + 12 text responses
vsAsk them anything yourself
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