What is the difference between Gemini 2.5 Pro (I/O Edition) and GPT-5?

Gemini 2.5 Pro (I/O Edition) is developed by Google AI while GPT-5 is developed by OpenAI. in 41 community votes on Rival, Gemini 2.5 Pro (I/O Edition) wins 62% of head-to-head matchups. These results are based on blind head-to-head voting across 41 challenges.

Which is better, Gemini 2.5 Pro (I/O Edition) or GPT-5?

Based on 41 community votes on Rival, Gemini 2.5 Pro (I/O Edition) wins 62% of head-to-head matchups against GPT-5. Gemini 2.5 Pro (I/O Edition) is strongest in Image Generation, Reasoning, Conversation.

How much does Gemini 2.5 Pro (I/O Edition) cost compared to GPT-5?

Gemini 2.5 Pro (I/O Edition) costs $1.25/M input tokens and GPT-5 costs $1.25/M input tokens. GPT-5 is $0.00/M cheaper per input. The more expensive model wins 62% of duels, so the premium may be justified by quality.

How are Gemini 2.5 Pro (I/O Edition) vs GPT-5 votes collected on Rival?

Rival presents both models' outputs side-by-side in blind duels. Voters see the responses but don't know which model produced each one, eliminating brand bias. 41 votes have been collected for this pair across 41 challenges. All vote data is part of Rival's open dataset.

Updated Aug 2025

Gemini 2.5 Pro (I/O Edition)vsGPT-5

Gemini 2.5 Pro (I/O Edition) wins 62% of 41 blind community votes against GPT-5 on Rival.

Gemini 2.5 Pro (I/O Edition) and GPT-5 compared across 41 shared prompts
Spec	Gemini 2.5 Pro (I/O Edition)	GPT-5
Win rate	62%	38%
Input price	$1.25/M tokens	$1.25/M tokens
Output price	$10/M tokens	$10/M tokens
Context window	—	400K tokens
Parameters	Not disclosed	Not disclosed
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	May 2025	Aug 2025