Question 1

What is the difference between Gemini 2.5 Flash Preview and GPT-5?

Accepted Answer

Gemini 2.5 Flash Preview is developed by Google AI while GPT-5 is developed by OpenAI. Gemini 2.5 Flash Preview has a 1.0M token context window vs GPT-5's 400K. These results are based on blind head-to-head voting across 27 challenges.

Question 2

Which is better, Gemini 2.5 Flash Preview or GPT-5?

Accepted Answer

Based on 2 community votes on RIVAL, Gemini 2.5 Flash Preview and GPT-5 are closely matched with similar win rates. The better choice depends on your specific use case — compare their real outputs side-by-side across 27 challenges to decide.

Question 3

How much does Gemini 2.5 Flash Preview cost compared to GPT-5?

Accepted Answer

Gemini 2.5 Flash Preview costs $0.15/M input tokens and GPT-5 costs $1.25/M input tokens. Gemini 2.5 Flash Preview is $1.10/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 GPT-5 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. 2 votes have been collected for this pair across 27 challenges. All vote data is part of RIVAL's open dataset.