What is the difference between DeepSeek V3.1 and Gemini 2.5 Flash Preview 05-20 (thinking)?

DeepSeek V3.1 is developed by DeepSeek while Gemini 2.5 Flash Preview 05-20 (thinking) is developed by Google AI. DeepSeek V3.1 has a 164K token context window vs Gemini 2.5 Flash Preview 05-20 (thinking)'s 1.0M. You can compare their actual outputs across 12 challenges on Rival to see how they differ in practice.

Which is better, DeepSeek V3.1 or Gemini 2.5 Flash Preview 05-20 (thinking)?

It depends on your use case. DeepSeek V3.1 and Gemini 2.5 Flash Preview 05-20 (thinking) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 12 challenges so you can judge which fits your needs best.

How much does DeepSeek V3.1 cost compared to Gemini 2.5 Flash Preview 05-20 (thinking)?

DeepSeek V3.1 costs $0.2/M input tokens and Gemini 2.5 Flash Preview 05-20 (thinking) costs $0.15/M input tokens. Gemini 2.5 Flash Preview 05-20 (thinking) is $0.05/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 V3.1 and Gemini 2.5 Flash Preview 05-20 (thinking) on Rival?

This page shows a side-by-side comparison of DeepSeek V3.1 and Gemini 2.5 Flash Preview 05-20 (thinking) 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.

Updated Aug 2025

DeepSeek V3.1vsGemini 2.5 Flash Preview 05-20 (thinking)

Gemini 2.5 Flash Preview 05-20 (thinking) is cheaper than DeepSeek V3.1 at $0.15/M vs $0.2/M input tokens.

DeepSeek V3.1 and Gemini 2.5 Flash Preview 05-20 (thinking) compared across 12 shared prompts
Spec	DeepSeek V3.1	Gemini 2.5 Flash Preview 05-20 (thinking)
Input price	$0.2/M tokens	$0.15/M tokens
Output price	$0.8/M tokens	$3.5/M tokens
Context window	164K tokens	1.0M tokens
Weights	Open	—
Free API (OpenRouter)	No	No
Released	Aug 2025	May 2025