DeepSeek R1 vs Gemini 2.5 Flash Preview

Compare DeepSeek R1 by DeepSeek against Gemini 2.5 Flash Preview by Google AI, in 1 community votes, deepseek r1 wins 100% of head-to-head duels, context windows of 128K vs 1.0M, tested across 27 shared challenges. Updated April 2026.

Which is better, DeepSeek R1 or Gemini 2.5 Flash Preview?

DeepSeek R1 is the better choice overall, winning 100% of 1 blind community votes on Rival. DeepSeek R1 costs $0.55/M input tokens vs $0.15/M for Gemini 2.5 Flash Preview. Context windows: 128K vs 1049K tokens. Compare their real outputs side by side below.

Key Differences Between DeepSeek R1 and Gemini 2.5 Flash Preview

DeepSeek R1 is made by deepseek while Gemini 2.5 Flash Preview is from google. DeepSeek R1 has a 128K token context window compared to Gemini 2.5 Flash Preview's 1049K. On pricing, DeepSeek R1 costs $0.55/M input tokens vs $0.15/M for Gemini 2.5 Flash Preview. In community voting, In 1 community votes, DeepSeek R1 wins 100% of head-to-head duels.

In 1 community votes, DeepSeek R1 wins 100% of head-to-head duels. Based on blind community voting from the Rival open dataset of 1+ human preference judgments for this pair.

Our Verdict
DeepSeek R1
DeepSeek R1Winner
Gemini 2.5 Flash Preview
Gemini 2.5 Flash PreviewRunner-up

Pick DeepSeek R1. In 1 blind votes, DeepSeek R1 wins 100% of the time. That's not luck.

Gemini 2.5 Flash Preview is 3.6x cheaper per token — worth considering if cost matters.

Clear winner
Writing DNA

Style Comparison

Similarity
94%

DeepSeek R1 uses 4.3x more emoji

DeepSeek R1
Gemini 2.5 Flash Preview
62%Vocabulary51%
15wSentence Length15w
0.52Hedging0.70
8.0Bold4.1
5.7Lists3.3
0.04Emoji0.00
0.62Headings0.09
0.28Transitions0.24
Based on 22 + 12 text responses
vs

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DeepSeek R1Gemini 2.5 Flash Preview
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