o1
Nothing here. The model returned empty. We stared at it for a while.
o1 vs Claude Opus 4
Compare o1 by OpenAI against Claude Opus 4 by Anthropic, in 1 community votes, o1 and claude opus 4 are closely matched, context windows of 128K vs 200K, tested across 35 shared challenges. Updated April 2026.
Which is better, o1 or Claude Opus 4?
o1 and Claude Opus 4 are closely matched based on 1 community votes. o1 costs $15/M input tokens vs $15/M for Claude Opus 4. Context windows: 128K vs 200K tokens. Compare their real outputs side by side below.
Key Differences Between o1 and Claude Opus 4
o1 is made by openai while Claude Opus 4 is from anthropic. o1 has a 128K token context window compared to Claude Opus 4's 200K. On pricing, o1 costs $15/M input tokens vs $15/M for Claude Opus 4. In community voting, In 1 community votes, o1 and Claude Opus 4 are closely matched.
In 1 community votes, o1 and Claude Opus 4 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
o1
Claude Opus 4
64%Vocabulary64%
16wSentence Length62w
0.76Hedging0.52
5.0Bold4.4
2.6Lists9.1
0.00Emoji0.11
0.44Headings1.87
0.40Transitions0.27
Based on 13 + 16 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