Question 1

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

Accepted Answer

Gemini 2.5 Flash Preview (thinking) is developed by Google AI while GPT-5 is developed by OpenAI. Gemini 2.5 Flash Preview (thinking) has a 1.0M token context window vs GPT-5's 400K. in 1 community votes on RIVAL, GPT-5 wins 100% of head-to-head matchups. These results are based on blind head-to-head voting across 20 challenges.

Question 2

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

Accepted Answer

Based on 1 community votes on RIVAL, GPT-5 wins 100% of head-to-head matchups against Gemini 2.5 Flash Preview (thinking).

Question 3

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

Accepted Answer

Gemini 2.5 Flash Preview (thinking) costs $0.175/M input tokens and GPT-5 costs $1.25/M input tokens. Gemini 2.5 Flash Preview (thinking) is $1.07/M cheaper per input. The more expensive model wins 100% of duels, so the premium may be justified by quality.

Question 4

How are Gemini 2.5 Flash Preview (thinking) 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. 1 votes have been collected for this pair across 20 challenges. All vote data is part of RIVAL's open dataset.