What is the difference between Gemini 2.5 Flash Preview 05-20 (thinking) and GPT-5.4?

Gemini 2.5 Flash Preview 05-20 (thinking) is developed by Google AI while GPT-5.4 is developed by OpenAI. Gemini 2.5 Flash Preview 05-20 (thinking) has a 1.0M token context window vs GPT-5.4's 1.1M. You can compare their actual outputs across 11 challenges on Rival to see how they differ in practice.

Which is better, Gemini 2.5 Flash Preview 05-20 (thinking) or GPT-5.4?

It depends on your use case. Gemini 2.5 Flash Preview 05-20 (thinking) and GPT-5.4 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 11 challenges so you can judge which fits your needs best.

How much does Gemini 2.5 Flash Preview 05-20 (thinking) cost compared to GPT-5.4?

Gemini 2.5 Flash Preview 05-20 (thinking) costs $0.15/M input tokens and GPT-5.4 costs $2.5/M input tokens. Gemini 2.5 Flash Preview 05-20 (thinking) is $2.35/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 05-20 (thinking) and GPT-5.4 on Rival?

This page shows a side-by-side comparison of Gemini 2.5 Flash Preview 05-20 (thinking) and GPT-5.4 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 05-20 (thinking) and GPT-5.4?

Gemini 2.5 Flash Preview 05-20 (thinking) is developed by Google AI while GPT-5.4 is developed by OpenAI. Gemini 2.5 Flash Preview 05-20 (thinking) has a 1.0M token context window vs GPT-5.4's 1.1M. You can compare their actual outputs across 11 challenges on Rival to see how they differ in practice.

Which is better, Gemini 2.5 Flash Preview 05-20 (thinking) or GPT-5.4?

It depends on your use case. Gemini 2.5 Flash Preview 05-20 (thinking) and GPT-5.4 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 11 challenges so you can judge which fits your needs best.

How much does Gemini 2.5 Flash Preview 05-20 (thinking) cost compared to GPT-5.4?

Gemini 2.5 Flash Preview 05-20 (thinking) costs $0.15/M input tokens and GPT-5.4 costs $2.5/M input tokens. Gemini 2.5 Flash Preview 05-20 (thinking) is $2.35/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 05-20 (thinking) and GPT-5.4 on Rival?

This page shows a side-by-side comparison of Gemini 2.5 Flash Preview 05-20 (thinking) and GPT-5.4 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 05-20 (thinking) vs GPT-5.4: Which Is Better?

Updated Mar 2026

Our Verdict

GPT-5.4

Gemini 2.5 Flash Preview 05-20 (thinking)Runner-up

No community votes yet. On paper, GPT-5.4 has the edge — bigger model tier, newer.

Gemini 2.5 Flash Preview 05-20 (thinking) is 4.3x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

Gemini 2.5 Flash Preview 05-20 (thinking)

Input

$0.15

17× cheaper

Output

$3.50

4.3× cheaper

GPT-5.4

Input

$2.50

Output

$15.00

Gemini 2.5 Flash Preview 05-20 (thinking) is cheaper on both — 17× input, 4.3× output

Writing DNA

Style Comparison

Similarity

36%

GPT-5.4 uses 68.8x more hedging

Gemini 2.5 Flash Preview 05-20 (thinking)

GPT-5.4

70%Vocabulary54%

11wSentence Length28w

0.00Hedging0.69

4.2Bold4.1

7.3Lists8.1

0.00Emoji0.00

0.00Headings1.84

0.00Transitions0.02

Based on 3 + 22 text responses

Research

What we learned reading every model

Gemini 2.5 Flash Preview 05-20 (thinking) and GPT-5.4 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 05-20 (thinking) vs MiniMax M3New provider

Gemini 2.5 Flash Preview 05-20 (thinking) vs Claude Opus 4New provider

GPT-5.4 vs Gemini 2.5 Pro Preview 06-05Cross-provider

Updated Mar 2026

Our Verdict

GPT-5.4

Gemini 2.5 Flash Preview 05-20 (thinking)Runner-up

No community votes yet. On paper, GPT-5.4 has the edge — bigger model tier, newer.

Gemini 2.5 Flash Preview 05-20 (thinking) is 4.3x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

Gemini 2.5 Flash Preview 05-20 (thinking)

Input

$0.15

17× cheaper

Output

$3.50

4.3× cheaper

GPT-5.4

Input

$2.50

Output

$15.00

Gemini 2.5 Flash Preview 05-20 (thinking) is cheaper on both — 17× input, 4.3× output

Writing DNA

Style Comparison

Similarity

36%

GPT-5.4 uses 68.8x more hedging

Gemini 2.5 Flash Preview 05-20 (thinking)

GPT-5.4

70%Vocabulary54%

11wSentence Length28w

0.00Hedging0.69

4.2Bold4.1

7.3Lists8.1

0.00Emoji0.00

0.00Headings1.84

0.00Transitions0.02

Based on 3 + 22 text responses

Research

What we learned reading every model

Gemini 2.5 Flash Preview 05-20 (thinking) and GPT-5.4 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 05-20 (thinking) vs MiniMax M3New provider

Gemini 2.5 Flash Preview 05-20 (thinking) vs Claude Opus 4New provider

GPT-5.4 vs Gemini 2.5 Pro Preview 06-05Cross-provider