Claude Opus 4
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Claude Opus 4 vs o1
Compare Claude Opus 4 by Anthropic against o1 by OpenAI, in 1 community votes, claude opus 4 and o1 are closely matched, context windows of 200K vs 128K, tested across 35 shared challenges. Updated April 2026.
Which is better, Claude Opus 4 or o1?
Claude Opus 4 and o1 are closely matched based on 1 community votes. Claude Opus 4 costs $15/M input tokens vs $15/M for o1. Context windows: 200K vs 128K tokens. Compare their real outputs side by side below.
Key Differences Between Claude Opus 4 and o1
Claude Opus 4 is made by anthropic while o1 is from openai. Claude Opus 4 has a 200K token context window compared to o1's 128K. On pricing, Claude Opus 4 costs $15/M input tokens vs $15/M for o1. In community voting, In 1 community votes, Claude Opus 4 and o1 are closely matched.
In 1 community votes, Claude Opus 4 and o1 are closely matched. Based on blind community voting from the Rival open dataset of 1+ human preference judgments for this pair.
Our Verdict
Claude Opus 4Winner
o1Runner-up
Votes are tied. Claude Opus 4 is newer and likely incorporates more recent improvements.
Too close to call
Writing DNA
Style Comparison
Similarity
93%
Claude Opus 4 uses 11.2x more emoji
Claude Opus 4
o1
64%Vocabulary64%
62wSentence Length16w
0.52Hedging0.76
4.4Bold5.0
9.1Lists2.6
0.11Emoji0.00
1.87Headings0.44
0.27Transitions0.40
Based on 16 + 13 text responses
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