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Claude Haiku 4.5 vs Claude Opus 4

Compare Claude Haiku 4.5 and Claude Opus 4, both from Anthropic, context windows of 200K vs 200K, tested across 35 shared challenges. Updated April 2026.

Which is better, Claude Haiku 4.5 or Claude Opus 4?

Claude Haiku 4.5 and Claude Opus 4 are both competitive models. Claude Haiku 4.5 costs $1/M input tokens vs $15/M for Claude Opus 4. Context windows: 200K vs 200K tokens. Compare their real outputs side by side below.

Key Differences Between Claude Haiku 4.5 and Claude Opus 4

Claude Haiku 4.5 is made by anthropic while Claude Opus 4 is from anthropic. Claude Haiku 4.5 has a 200K token context window compared to Claude Opus 4's 200K. On pricing, Claude Haiku 4.5 costs $1/M input tokens vs $15/M for Claude Opus 4.

Our Verdict
Claude Haiku 4.5
Claude Haiku 4.5
Claude Opus 4
Claude Opus 4

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

Claude Haiku 4.5 is 15x cheaper per token — worth considering if cost matters.

Too close to call
Writing DNA

Style Comparison

Similarity
100%

Claude Haiku 4.5 uses 1.8x more emoji

Claude Haiku 4.5
Claude Opus 4
61%Vocabulary64%
47wSentence Length62w
0.64Hedging0.52
5.1Bold4.4
6.3Lists9.1
0.20Emoji0.11
2.46Headings1.87
0.17Transitions0.27
Based on 24 + 16 text responses
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Claude Haiku 4.5Claude 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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