What is the difference between Gemini 2.5 Flash Preview (thinking) and OpenAI o3?

Gemini 2.5 Flash Preview (thinking) is developed by Google AI while OpenAI o3 is developed by OpenAI. You can compare their actual outputs across 20 challenges on Rival to see how they differ in practice.

Which is better, Gemini 2.5 Flash Preview (thinking) or OpenAI o3?

It depends on your use case. Gemini 2.5 Flash Preview (thinking) and OpenAI o3 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 20 challenges so you can judge which fits your needs best.

How much does Gemini 2.5 Flash Preview (thinking) cost compared to OpenAI o3?

Gemini 2.5 Flash Preview (thinking) costs $0.175/M input tokens and OpenAI o3 costs $10/M input tokens. Gemini 2.5 Flash Preview (thinking) is $9.82/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare Gemini 2.5 Flash Preview (thinking) and OpenAI o3 on Rival?

This page shows a side-by-side comparison of Gemini 2.5 Flash Preview (thinking) and OpenAI o3 across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

What is the difference between Gemini 2.5 Flash Preview (thinking) and OpenAI o3?

Gemini 2.5 Flash Preview (thinking) is developed by Google AI while OpenAI o3 is developed by OpenAI. You can compare their actual outputs across 20 challenges on Rival to see how they differ in practice.

Which is better, Gemini 2.5 Flash Preview (thinking) or OpenAI o3?

It depends on your use case. Gemini 2.5 Flash Preview (thinking) and OpenAI o3 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 20 challenges so you can judge which fits your needs best.

How much does Gemini 2.5 Flash Preview (thinking) cost compared to OpenAI o3?

Gemini 2.5 Flash Preview (thinking) costs $0.175/M input tokens and OpenAI o3 costs $10/M input tokens. Gemini 2.5 Flash Preview (thinking) is $9.82/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare Gemini 2.5 Flash Preview (thinking) and OpenAI o3 on Rival?

This page shows a side-by-side comparison of Gemini 2.5 Flash Preview (thinking) and OpenAI o3 across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

Gemini 2.5 Flash Preview (thinking) vs OpenAI o3: Which Is Better?

Updated Apr 2025

Our Verdict

OpenAI o3

Gemini 2.5 Flash Preview (thinking)Runner-up

No community votes yet. On paper, OpenAI o3 has the edge — bigger model tier.

Gemini 2.5 Flash Preview (thinking) is 11x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

Gemini 2.5 Flash Preview (thinking)

Input

$0.17

57× cheaper

Output

$3.50

11× cheaper

OpenAI o3

Input

$10.00

Output

$40.00

Gemini 2.5 Flash Preview (thinking) is cheaper on both — 57× input, 11× output

Writing DNA

Style Comparison

Similarity

34%

OpenAI o3 uses 37.9x more headings

Gemini 2.5 Flash Preview (thinking)

OpenAI o3

53%Vocabulary68%

14wSentence Length14w

0.38Hedging0.26

4.4Bold0.7

4.1Lists3.0

0.00Emoji0.00

0.00Headings0.38

0.24Transitions0.12

Based on 7 + 16 text responses

Research

What we learned reading every model

Gemini 2.5 Flash Preview (thinking) and OpenAI o3 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

OpenAI o3 vs Gemini 2.5 Pro Preview 06-05Cross-provider

Gemini 2.5 Flash Preview (thinking) vs MiniMax M3New provider

Gemini 2.5 Flash Preview (thinking) vs Grok 3New provider

Updated Apr 2025

Our Verdict

OpenAI o3

Gemini 2.5 Flash Preview (thinking)Runner-up

No community votes yet. On paper, OpenAI o3 has the edge — bigger model tier.

Gemini 2.5 Flash Preview (thinking) is 11x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

Gemini 2.5 Flash Preview (thinking)

Input

$0.17

57× cheaper

Output

$3.50

11× cheaper

OpenAI o3

Input

$10.00

Output

$40.00

Gemini 2.5 Flash Preview (thinking) is cheaper on both — 57× input, 11× output

Writing DNA

Style Comparison

Similarity

34%

OpenAI o3 uses 37.9x more headings

Gemini 2.5 Flash Preview (thinking)

OpenAI o3

53%Vocabulary68%

14wSentence Length14w

0.38Hedging0.26

4.4Bold0.7

4.1Lists3.0

0.00Emoji0.00

0.00Headings0.38

0.24Transitions0.12

Based on 7 + 16 text responses

Research

What we learned reading every model

Gemini 2.5 Flash Preview (thinking) and OpenAI o3 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

OpenAI o3 vs Gemini 2.5 Pro Preview 06-05Cross-provider

Gemini 2.5 Flash Preview (thinking) vs MiniMax M3New provider

Gemini 2.5 Flash Preview (thinking) vs Grok 3New provider