What is the difference between Gemini 3.5 Flash and GPT-5.4 Mini?

Gemini 3.5 Flash is developed by Google AI while GPT-5.4 Mini is developed by OpenAI. Gemini 3.5 Flash has a 1.0M token context window vs GPT-5.4 Mini's 400K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Gemini 3.5 Flash or GPT-5.4 Mini?

It depends on your use case. Gemini 3.5 Flash and GPT-5.4 Mini each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

How much does Gemini 3.5 Flash cost compared to GPT-5.4 Mini?

Gemini 3.5 Flash costs $1.5/M input tokens and GPT-5.4 Mini costs $0.75/M input tokens. GPT-5.4 Mini is $0.75/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 3.5 Flash and GPT-5.4 Mini on Rival?

This page shows a side-by-side comparison of Gemini 3.5 Flash and GPT-5.4 Mini 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 3.5 Flash and GPT-5.4 Mini?

Gemini 3.5 Flash is developed by Google AI while GPT-5.4 Mini is developed by OpenAI. Gemini 3.5 Flash has a 1.0M token context window vs GPT-5.4 Mini's 400K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Gemini 3.5 Flash or GPT-5.4 Mini?

It depends on your use case. Gemini 3.5 Flash and GPT-5.4 Mini each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

How much does Gemini 3.5 Flash cost compared to GPT-5.4 Mini?

Gemini 3.5 Flash costs $1.5/M input tokens and GPT-5.4 Mini costs $0.75/M input tokens. GPT-5.4 Mini is $0.75/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 3.5 Flash and GPT-5.4 Mini on Rival?

This page shows a side-by-side comparison of Gemini 3.5 Flash and GPT-5.4 Mini 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 3.5 Flash vs GPT-5.4 Mini: Which Is Better?

Updated May 2026

Our Verdict

Gemini 3.5 Flash

GPT-5.4 MiniRunner-up

No community votes yet. On paper, Gemini 3.5 Flash has the edge — bigger model tier, newer, bigger context window.

Slight edge

API pricing

Cost per 1M tokens

Gemini 3.5 Flash

Input

$1.50

Output

$9.00

GPT-5.4 Mini

Input

$0.75

2.0× cheaper

Output

$4.50

2.0× cheaper

GPT-5.4 Mini is cheaper on both — 2.0× input, 2.0× output

Writing DNA

Style Comparison

Similarity

41%

GPT-5.4 Mini uses 4.6x more hedging

Gemini 3.5 Flash

GPT-5.4 Mini

59%Vocabulary54%

18wSentence Length20w

0.16Hedging0.72

4.4Bold6.0

3.0Lists8.3

0.00Emoji0.00

0.89Headings2.11

0.11Transitions0.04

Based on 27 + 23 text responses

Research

What we learned reading every model

Gemini 3.5 Flash and GPT-5.4 Mini 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

GPT-5.4 Mini vs MiniMax M3New provider

GPT-5.4 Mini vs Meta: Muse Spark 1.1New provider

GPT-5.4 Mini vs Claude Sonnet 4New provider

Updated May 2026

Our Verdict

Gemini 3.5 Flash

GPT-5.4 MiniRunner-up

No community votes yet. On paper, Gemini 3.5 Flash has the edge — bigger model tier, newer, bigger context window.

Slight edge

API pricing

Cost per 1M tokens

Gemini 3.5 Flash

Input

$1.50

Output

$9.00

GPT-5.4 Mini

Input

$0.75

2.0× cheaper

Output

$4.50

2.0× cheaper

GPT-5.4 Mini is cheaper on both — 2.0× input, 2.0× output

Writing DNA

Style Comparison

Similarity

41%

GPT-5.4 Mini uses 4.6x more hedging

Gemini 3.5 Flash

GPT-5.4 Mini

59%Vocabulary54%

18wSentence Length20w

0.16Hedging0.72

4.4Bold6.0

3.0Lists8.3

0.00Emoji0.00

0.89Headings2.11

0.11Transitions0.04

Based on 27 + 23 text responses

Research

What we learned reading every model

Gemini 3.5 Flash and GPT-5.4 Mini 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

GPT-5.4 Mini vs MiniMax M3New provider

GPT-5.4 Mini vs Meta: Muse Spark 1.1New provider

GPT-5.4 Mini vs Claude Sonnet 4New provider