Question 1

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

Accepted Answer

Gemini 2.5 Flash Preview (thinking) is developed by Google AI while Claude Sonnet 4 is developed by Anthropic. Gemini 2.5 Flash Preview (thinking) has a 1.0M token context window vs Claude Sonnet 4's 200K. in 3 community votes on RIVAL, Claude Sonnet 4 wins 67% of head-to-head matchups. These results are based on blind head-to-head voting across 14 challenges.

Question 2

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

Accepted Answer

Based on 3 community votes on RIVAL, Claude Sonnet 4 wins 67% of head-to-head matchups against Gemini 2.5 Flash Preview (thinking). Claude Sonnet 4 is strongest in Image Generation.

Question 3

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

Accepted Answer

Gemini 2.5 Flash Preview (thinking) costs $0.175/M input tokens and Claude Sonnet 4 costs $3/M input tokens. Gemini 2.5 Flash Preview (thinking) is $2.83/M cheaper per input. The more expensive model wins 67% of duels, so the premium may be justified by quality.

Question 4

How are Gemini 2.5 Flash Preview (thinking) 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. 3 votes have been collected for this pair across 14 challenges. All vote data is part of RIVAL's open dataset.