Claude Sonnet 4.5
Nothing here. The model returned empty. We stared at it for a while.
Claude Sonnet 4.5 vs OpenAI o3
Compare Claude Sonnet 4.5 by Anthropic against OpenAI o3 by OpenAI, in 2 community votes, claude sonnet 4.5 wins 100% of head-to-head duels, tested across 43 shared challenges. Updated April 2026.
Which is better, Claude Sonnet 4.5 or OpenAI o3?
Claude Sonnet 4.5 is the better choice overall, winning 100% of 2 blind community votes on Rival. Claude Sonnet 4.5 costs $3/M input tokens vs $10/M for OpenAI o3. Compare their real outputs side by side below.
Key Differences Between Claude Sonnet 4.5 and OpenAI o3
Claude Sonnet 4.5 is made by anthropic while OpenAI o3 is from openai. On pricing, Claude Sonnet 4.5 costs $3/M input tokens vs $10/M for OpenAI o3. In community voting, In 2 community votes, Claude Sonnet 4.5 wins 100% of head-to-head duels.
In 2 community votes, Claude Sonnet 4.5 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 4.5Winner
OpenAI o3Runner-up
Pick Claude Sonnet 4.5. In 2 blind votes, Claude Sonnet 4.5 wins 100% of the time. That's not luck.
Clear winner
Writing DNA
Style Comparison
Similarity
93%
Claude Sonnet 4.5 uses 45.2x more emoji
Claude Sonnet 4.5
OpenAI o3
64%Vocabulary68%
94wSentence Length14w
0.48Hedging0.26
4.9Bold0.7
8.0Lists3.0
0.45Emoji0.00
1.91Headings0.38
0.07Transitions0.12
Based on 20 + 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