What is the difference between DeepSeek R1 and Gemini 3.5 Flash?

DeepSeek R1 is developed by DeepSeek while Gemini 3.5 Flash is developed by Google AI. DeepSeek R1 has a 128K token context window vs Gemini 3.5 Flash's 1.0M. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, DeepSeek R1 or Gemini 3.5 Flash?

It depends on your use case. DeepSeek R1 and Gemini 3.5 Flash 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 DeepSeek R1 cost compared to Gemini 3.5 Flash?

DeepSeek R1 costs $0.55/M input tokens and Gemini 3.5 Flash costs $1.5/M input tokens. DeepSeek R1 is $0.95/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 DeepSeek R1 and Gemini 3.5 Flash on Rival?

This page shows a side-by-side comparison of DeepSeek R1 and Gemini 3.5 Flash 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 DeepSeek R1 and Gemini 3.5 Flash?

DeepSeek R1 is developed by DeepSeek while Gemini 3.5 Flash is developed by Google AI. DeepSeek R1 has a 128K token context window vs Gemini 3.5 Flash's 1.0M. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, DeepSeek R1 or Gemini 3.5 Flash?

It depends on your use case. DeepSeek R1 and Gemini 3.5 Flash 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 DeepSeek R1 cost compared to Gemini 3.5 Flash?

DeepSeek R1 costs $0.55/M input tokens and Gemini 3.5 Flash costs $1.5/M input tokens. DeepSeek R1 is $0.95/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 DeepSeek R1 and Gemini 3.5 Flash on Rival?

This page shows a side-by-side comparison of DeepSeek R1 and Gemini 3.5 Flash 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.

DeepSeek R1 vs Gemini 3.5 Flash: Which Is Better?

Updated May 2026

Our Verdict

Gemini 3.5 Flash

DeepSeek R1Runner-up

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

DeepSeek R1 is 4.1x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

DeepSeek R1

Input

$0.55

2.7× cheaper

Output

$2.19

4.1× cheaper

Gemini 3.5 Flash

Input

$1.50

Output

$9.00

DeepSeek R1 is cheaper on both — 2.7× input, 4.1× output

Writing DNA

Style Comparison

Similarity

56%

DeepSeek R1 uses 4.3x more emoji

DeepSeek R1

Gemini 3.5 Flash

62%Vocabulary59%

15wSentence Length18w

0.52Hedging0.16

8.0Bold4.4

5.7Lists3.0

0.04Emoji0.00

0.62Headings0.89

0.28Transitions0.11

Based on 22 + 27 text responses

Research

What we learned reading every model

DeepSeek R1 and Gemini 3.5 Flash 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

DeepSeek R1 vs MiniMax M3New provider

DeepSeek R1 vs GPT-5New provider

DeepSeek R1 vs Claude Sonnet 4New provider

Updated May 2026

Our Verdict

Gemini 3.5 Flash

DeepSeek R1Runner-up

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

DeepSeek R1 is 4.1x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

DeepSeek R1

Input

$0.55

2.7× cheaper

Output

$2.19

4.1× cheaper

Gemini 3.5 Flash

Input

$1.50

Output

$9.00

DeepSeek R1 is cheaper on both — 2.7× input, 4.1× output

Writing DNA

Style Comparison

Similarity

56%

DeepSeek R1 uses 4.3x more emoji

DeepSeek R1

Gemini 3.5 Flash

62%Vocabulary59%

15wSentence Length18w

0.52Hedging0.16

8.0Bold4.4

5.7Lists3.0

0.04Emoji0.00

0.62Headings0.89

0.28Transitions0.11

Based on 22 + 27 text responses

Research

What we learned reading every model

DeepSeek R1 and Gemini 3.5 Flash 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

DeepSeek R1 vs MiniMax M3New provider

DeepSeek R1 vs GPT-5New provider

DeepSeek R1 vs Claude Sonnet 4New provider