Question 1

What is the difference between OpenAI o3 and Claude Sonnet 4?

Accepted Answer

OpenAI o3 is developed by OpenAI while Claude Sonnet 4 is developed by Anthropic. in 9 community votes on RIVAL, Claude Sonnet 4 wins 83% of head-to-head matchups. These results are based on blind head-to-head voting across 33 challenges.

Question 2

Which is better, OpenAI o3 or Claude Sonnet 4?

Accepted Answer

Based on 9 community votes on RIVAL, Claude Sonnet 4 wins 83% of head-to-head matchups against OpenAI o3. Claude Sonnet 4 is strongest in Planning.

Question 3

How much does OpenAI o3 cost compared to Claude Sonnet 4?

Accepted Answer

OpenAI o3 costs $10/M input tokens and Claude Sonnet 4 costs $3/M input tokens. Claude Sonnet 4 is $7.00/M cheaper per input. Claude Sonnet 4 also wins more often in community votes, making it the better value.

Question 4

How are OpenAI o3 vs Claude Sonnet 4 votes collected on RIVAL?

Accepted Answer

RIVAL presents both models' outputs side-by-side in blind duels — voters see the responses but don't know which model produced each one. This eliminates brand bias. 9 votes have been collected for this pair across 33 challenges. All vote data is part of RIVAL's open dataset.