Question 1

What is the difference between Gemini 2.5 Flash Preview and Claude Sonnet 4?

Accepted Answer

Gemini 2.5 Flash Preview is developed by Google AI while Claude Sonnet 4 is developed by Anthropic. Gemini 2.5 Flash Preview has a 1.0M token context window vs Claude Sonnet 4's 200K. These results are based on blind head-to-head voting across 16 challenges.

Question 2

Which is better, Gemini 2.5 Flash Preview or Claude Sonnet 4?

Accepted Answer

Based on 6 community votes on RIVAL, Gemini 2.5 Flash Preview and Claude Sonnet 4 are closely matched with similar win rates. The better choice depends on your specific use case — compare their real outputs side-by-side across 16 challenges to decide.

Question 3

How much does Gemini 2.5 Flash Preview cost compared to Claude Sonnet 4?

Accepted Answer

Gemini 2.5 Flash Preview costs $0.15/M input tokens and Claude Sonnet 4 costs $3/M input tokens. Gemini 2.5 Flash Preview is $2.85/M cheaper per input. The more expensive model wins 50% of duels, so the premium may be justified by quality.

Question 4

How are Gemini 2.5 Flash Preview 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. 6 votes have been collected for this pair across 16 challenges. All vote data is part of RIVAL's open dataset.