o1
Nothing here. The model returned empty. We stared at it for a while.
o1 vs Claude Sonnet 4
Compare o1 by OpenAI against Claude Sonnet 4 by Anthropic, in 2 community votes, claude sonnet 4 wins 100% of head-to-head duels, context windows of 128K vs 200K, tested across 34 shared challenges. Updated April 2026.
Which is better, o1 or Claude Sonnet 4?
Claude Sonnet 4 is the better choice overall, winning 100% of 2 blind community votes on Rival. o1 costs $15/M input tokens vs $3/M for Claude Sonnet 4. Context windows: 128K vs 200K tokens. Compare their real outputs side by side below.
Key Differences Between o1 and Claude Sonnet 4
o1 is made by openai while Claude Sonnet 4 is from anthropic. o1 has a 128K token context window compared to Claude Sonnet 4's 200K. On pricing, o1 costs $15/M input tokens vs $3/M for Claude Sonnet 4. In community voting, In 2 community votes, Claude Sonnet 4 wins 100% of head-to-head duels.
In 2 community votes, Claude Sonnet 4 wins 100% of head-to-head duels. Based on blind community voting from the Rival open dataset of 2+ human preference judgments for this pair.
Our Verdict
Claude Sonnet 4Winner
o1Runner-up
Pick Claude Sonnet 4. In 2 blind votes, Claude Sonnet 4 wins 100% of the time. That's not luck.
Claude Sonnet 4 is 4.0x cheaper per token — worth considering if cost matters.
Clear winner
Writing DNA
Style Comparison
Similarity
92%
Claude Sonnet 4 uses 87.9x more emoji
o1
Claude Sonnet 4
64%Vocabulary62%
16wSentence Length111w
0.76Hedging0.40
5.0Bold5.0
2.6Lists9.3
0.00Emoji0.88
0.44Headings2.16
0.40Transitions0.33
Based on 13 + 17 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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