What is the difference between Gemini 2.5 Flash Preview (thinking) and GPT-4o (Omni)?

Gemini 2.5 Flash Preview (thinking) is developed by Google AI while GPT-4o (Omni) is developed by OpenAI. Gemini 2.5 Flash Preview (thinking) has a 1.0M token context window vs GPT-4o (Omni)'s 128K. These results are based on blind head-to-head voting across 20 challenges.

Which is better, Gemini 2.5 Flash Preview (thinking) or GPT-4o (Omni)?

Based on 2 community votes on Rival, Gemini 2.5 Flash Preview (thinking) and GPT-4o (Omni) are closely matched with similar win rates. The better choice depends on your specific use case. Compare their real outputs side-by-side across 20 challenges to decide.

How much does Gemini 2.5 Flash Preview (thinking) cost compared to GPT-4o (Omni)?

Gemini 2.5 Flash Preview (thinking) costs $0.175/M input tokens and GPT-4o (Omni) costs $2.5/M input tokens. Gemini 2.5 Flash Preview (thinking) is $2.33/M cheaper per input. The more expensive model wins 50% of duels, so the premium may be justified by quality.

How are Gemini 2.5 Flash Preview (thinking) vs GPT-4o (Omni) 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 20 challenges. All vote data is part of Rival's open dataset.

What is the difference between Gemini 2.5 Flash Preview (thinking) and GPT-4o (Omni)?

Gemini 2.5 Flash Preview (thinking) is developed by Google AI while GPT-4o (Omni) is developed by OpenAI. Gemini 2.5 Flash Preview (thinking) has a 1.0M token context window vs GPT-4o (Omni)'s 128K. These results are based on blind head-to-head voting across 20 challenges.

Which is better, Gemini 2.5 Flash Preview (thinking) or GPT-4o (Omni)?

Based on 2 community votes on Rival, Gemini 2.5 Flash Preview (thinking) and GPT-4o (Omni) are closely matched with similar win rates. The better choice depends on your specific use case. Compare their real outputs side-by-side across 20 challenges to decide.

How much does Gemini 2.5 Flash Preview (thinking) cost compared to GPT-4o (Omni)?

Gemini 2.5 Flash Preview (thinking) costs $0.175/M input tokens and GPT-4o (Omni) costs $2.5/M input tokens. Gemini 2.5 Flash Preview (thinking) is $2.33/M cheaper per input. The more expensive model wins 50% of duels, so the premium may be justified by quality.

How are Gemini 2.5 Flash Preview (thinking) vs GPT-4o (Omni) 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 20 challenges. All vote data is part of Rival's open dataset.

Gemini 2.5 Flash Preview (thinking) vs GPT-4o (Omni): Which Is Better?

Updated Apr 2025

Our Verdict

Gemini 2.5 Flash Preview (thinking)Winner

GPT-4o (Omni)Runner-up

Votes are tied. Gemini 2.5 Flash Preview (thinking) is newer and likely incorporates more recent improvements.

Too close to call

API pricing

Cost per 1M tokens

Gemini 2.5 Flash Preview (thinking)

Input

$0.17

14× cheaper

Output

$3.50

2.9× cheaper

GPT-4o (Omni)

Input

$2.50

Output

$10.00

Gemini 2.5 Flash Preview (thinking) is cheaper on both — 14× input, 2.9× output

Writing DNA

Style Comparison

Similarity

52%

GPT-4o (Omni) uses 2.5x more emoji

Gemini 2.5 Flash Preview (thinking)

GPT-4o (Omni)

53%Vocabulary54%

14wSentence Length18w

0.38Hedging0.72

4.4Bold7.3

4.1Lists5.6

0.00Emoji0.03

0.00Headings1.40

0.24Transitions0.26

Based on 7 + 24 text responses

Research

What we learned reading every model

Gemini 2.5 Flash Preview (thinking) and GPT-4o (Omni) 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

Gemini 2.5 Flash Preview (thinking) vs Llama 4 MaverickNew provider

Gemini 2.5 Flash Preview (thinking) vs GPT-5Cross-provider

GPT-4o (Omni) vs MiniMax M3New provider

Updated Apr 2025

Our Verdict

Gemini 2.5 Flash Preview (thinking)Winner

GPT-4o (Omni)Runner-up

Votes are tied. Gemini 2.5 Flash Preview (thinking) is newer and likely incorporates more recent improvements.

Too close to call

API pricing

Cost per 1M tokens

Gemini 2.5 Flash Preview (thinking)

Input

$0.17

14× cheaper

Output

$3.50

2.9× cheaper

GPT-4o (Omni)

Input

$2.50

Output

$10.00

Gemini 2.5 Flash Preview (thinking) is cheaper on both — 14× input, 2.9× output

Writing DNA

Style Comparison

Similarity

52%

GPT-4o (Omni) uses 2.5x more emoji

Gemini 2.5 Flash Preview (thinking)

GPT-4o (Omni)

53%Vocabulary54%

14wSentence Length18w

0.38Hedging0.72

4.4Bold7.3

4.1Lists5.6

0.00Emoji0.03

0.00Headings1.40

0.24Transitions0.26

Based on 7 + 24 text responses

Research

What we learned reading every model

Gemini 2.5 Flash Preview (thinking) and GPT-4o (Omni) 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

Gemini 2.5 Flash Preview (thinking) vs Llama 4 MaverickNew provider

Gemini 2.5 Flash Preview (thinking) vs GPT-5Cross-provider

GPT-4o (Omni) vs MiniMax M3New provider