What is the difference between ChatGPT-4o (March 2025) and Gemini 2.5 Flash Preview?

ChatGPT-4o (March 2025) is developed by OpenAI while Gemini 2.5 Flash Preview is developed by Google AI. ChatGPT-4o (March 2025) has a 128K token context window vs Gemini 2.5 Flash Preview's 1.0M. in 2 community votes on Rival, Gemini 2.5 Flash Preview wins 100% of head-to-head matchups. These results are based on blind head-to-head voting across 16 challenges.

Which is better, ChatGPT-4o (March 2025) or Gemini 2.5 Flash Preview?

Based on 2 community votes on Rival, Gemini 2.5 Flash Preview wins 100% of head-to-head matchups against ChatGPT-4o (March 2025).

How much does ChatGPT-4o (March 2025) cost compared to Gemini 2.5 Flash Preview?

ChatGPT-4o (March 2025) costs $5/M input tokens and Gemini 2.5 Flash Preview costs $0.15/M input tokens. Gemini 2.5 Flash Preview is $4.85/M cheaper per input. Gemini 2.5 Flash Preview also wins more often in community votes, making it the better value.

How are ChatGPT-4o (March 2025) vs Gemini 2.5 Flash Preview 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. 2 votes have been collected for this pair across 16 challenges. All vote data is part of Rival's open dataset.

What is the difference between ChatGPT-4o (March 2025) and Gemini 2.5 Flash Preview?

ChatGPT-4o (March 2025) is developed by OpenAI while Gemini 2.5 Flash Preview is developed by Google AI. ChatGPT-4o (March 2025) has a 128K token context window vs Gemini 2.5 Flash Preview's 1.0M. in 2 community votes on Rival, Gemini 2.5 Flash Preview wins 100% of head-to-head matchups. These results are based on blind head-to-head voting across 16 challenges.

Which is better, ChatGPT-4o (March 2025) or Gemini 2.5 Flash Preview?

Based on 2 community votes on Rival, Gemini 2.5 Flash Preview wins 100% of head-to-head matchups against ChatGPT-4o (March 2025).

How much does ChatGPT-4o (March 2025) cost compared to Gemini 2.5 Flash Preview?

ChatGPT-4o (March 2025) costs $5/M input tokens and Gemini 2.5 Flash Preview costs $0.15/M input tokens. Gemini 2.5 Flash Preview is $4.85/M cheaper per input. Gemini 2.5 Flash Preview also wins more often in community votes, making it the better value.

How are ChatGPT-4o (March 2025) vs Gemini 2.5 Flash Preview 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. 2 votes have been collected for this pair across 16 challenges. All vote data is part of Rival's open dataset.

ChatGPT-4o (March 2025) vs Gemini 2.5 Flash Preview: Which Is Better?

Updated Apr 2025

Our Verdict

Gemini 2.5 Flash PreviewWinner

ChatGPT-4o (March 2025)Runner-up

Pick Gemini 2.5 Flash Preview. In 2 blind votes, Gemini 2.5 Flash Preview wins 100% of the time. That's not luck.

Gemini 2.5 Flash Preview is 25x cheaper per token — worth considering if cost matters.

Clear winner

API pricing

Cost per 1M tokens

ChatGPT-4o (March 2025)

Input

$5.00

Output

$15.00

Gemini 2.5 Flash Preview

Input

$0.15

33× cheaper

Output

$0.60

25× cheaper

Gemini 2.5 Flash Preview is cheaper on both — 33× input, 25× output

Writing DNA

Style Comparison

Similarity

41%

ChatGPT-4o (March 2025) uses 94.5x more emoji

ChatGPT-4o (March 2025)

Gemini 2.5 Flash Preview

55%Vocabulary51%

24wSentence Length15w

0.52Hedging0.70

3.3Bold4.1

6.0Lists3.3

0.94Emoji0.00

0.63Headings0.09

0.05Transitions0.24

Based on 15 + 12 text responses

Research

What we learned reading every model

ChatGPT-4o (March 2025) and Gemini 2.5 Flash Preview have opinions about your brand too.Ask 10 models what they tell people about you. Verbatim receipts.Run the mirror

FAQ

Common questions

Keep exploring

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ChatGPT-4o (March 2025) vs Llama 4 MaverickNew provider

ChatGPT-4o (March 2025) vs MiniMax M3New provider

ChatGPT-4o (March 2025) vs Grok 3New provider

Updated Apr 2025

Our Verdict

Gemini 2.5 Flash PreviewWinner

ChatGPT-4o (March 2025)Runner-up

Pick Gemini 2.5 Flash Preview. In 2 blind votes, Gemini 2.5 Flash Preview wins 100% of the time. That's not luck.

Gemini 2.5 Flash Preview is 25x cheaper per token — worth considering if cost matters.

Clear winner

API pricing

Cost per 1M tokens

ChatGPT-4o (March 2025)

Input

$5.00

Output

$15.00

Gemini 2.5 Flash Preview

Input

$0.15

33× cheaper

Output

$0.60

25× cheaper

Gemini 2.5 Flash Preview is cheaper on both — 33× input, 25× output

Writing DNA

Style Comparison

Similarity

41%

ChatGPT-4o (March 2025) uses 94.5x more emoji

ChatGPT-4o (March 2025)

Gemini 2.5 Flash Preview

55%Vocabulary51%

24wSentence Length15w

0.52Hedging0.70

3.3Bold4.1

6.0Lists3.3

0.94Emoji0.00

0.63Headings0.09

0.05Transitions0.24

Based on 15 + 12 text responses

Research

What we learned reading every model

ChatGPT-4o (March 2025) and Gemini 2.5 Flash Preview have opinions about your brand too.Ask 10 models what they tell people about you. Verbatim receipts.Run the mirror

FAQ

Common questions

Keep exploring

More comparisons

ChatGPT-4o (March 2025) vs Llama 4 MaverickNew provider

ChatGPT-4o (March 2025) vs MiniMax M3New provider

ChatGPT-4o (March 2025) vs Grok 3New provider