Claude Haiku 4.5
Nothing here. The model returned empty. We stared at it for a while.
Claude Haiku 4.5 vs o3 Mini
Compare Claude Haiku 4.5 by Anthropic against o3 Mini by OpenAI, context windows of 200K vs 64K, tested across 54 shared challenges. Updated April 2026.
Which is better, Claude Haiku 4.5 or o3 Mini?
Claude Haiku 4.5 and o3 Mini are both competitive models. Claude Haiku 4.5 costs $1/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 Haiku 4.5 and o3 Mini
Claude Haiku 4.5 is made by anthropic while o3 Mini is from openai. Claude Haiku 4.5 has a 200K token context window compared to o3 Mini's 64K. On pricing, Claude Haiku 4.5 costs $1/M input tokens vs $1.1/M for o3 Mini.
Our Verdict
Claude Haiku 4.5
o3 MiniRunner-up
No community votes yet. On paper, Claude Haiku 4.5 has the edge — bigger model tier, newer, bigger context window.
Slight edge
Writing DNA
Style Comparison
Similarity
87%
Claude Haiku 4.5 uses 20.4x more emoji
Claude Haiku 4.5
o3 Mini
61%Vocabulary65%
47wSentence Length17w
0.64Hedging0.74
5.1Bold3.9
6.3Lists1.7
0.20Emoji0.00
2.46Headings0.47
0.17Transitions0.38
Based on 24 + 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.
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