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  5. DeepSeek V4 FlashvsGemini 2.5 Flash Preview (thinking)
Updated Apr 2026

DeepSeek V4 FlashvsGemini 2.5 Flash Preview (thinking)

DeepSeek V4 Flash is cheaper than Gemini 2.5 Flash Preview (thinking) at $0.14/M vs $0.175/M input tokens.

DeepSeek V4 Flash and Gemini 2.5 Flash Preview (thinking) compared across 20 shared prompts
SpecDeepSeek V4 FlashGemini 2.5 Flash Preview (thinking)
Input price$0.14/M tokens$0.175/M tokens
Output price$0.28/M tokens$3.5/M tokens
Context window1.0M tokens1.0M tokens
WeightsOpen—
Free API (OpenRouter)NoNo
ReleasedApr 2026Apr 2025
Side by side

Same prompt, both answers

Opening lines from 6 of the 20 prompts both answered. Formatting stripped, words untouched.

Generate a Stand-Up Routine

Write a 3-minute stand-up comedy routine that isn't based on puns.

DeepSeek V4 Flash696 words
(Strolls to center stage, adjusts mic, gives a weary smile to the audience) Thank you. Thank you so much. That’s very kind. I’m glad you’re all here. Because I have some news. I have finally figured out adulthood. It happened about six months ago. I bought a house.
Read the full answer
Gemini 2.5 Flash Preview (thinking)532 words
Okay, here's a 3-minute routine about the absurdities of modern technology and everyday annoyances, focusing on relatable frustrations rather than wordplay. (Start) "Alright, alright, settle in! How we doing tonight? Good to be here! Thanks for coming out. So, I've been thinking... we paid for convenience, right?
Read the full answer

Character Voice Test

Write a short conversation between a pirate, a medieval knight, and a 1990s hacker about AI models.

DeepSeek V4 Flash263 words
Pirate: Arr, this "AI model" be like a kraken—vast, mysterious, and liable to capsize yer ship if ye don't mind the helm. But who's trainin' the beast? Knight: Forsooth, I would call it a golem. Forged not of clay and incantations, but of numbers and cold lightning.
Read the full answer
Gemini 2.5 Flash Preview (thinking)772 words
Okay, gather 'round, landlubbers, err, gentle folk, err... whoever you are. Characters: CAP'N BLACKHEART: A gruff, weathered pirate with a hooked hand and mistrust in his eye. SIR GALAHAD THE EARNEST: A shining knight in slightly dusty armor, noble and literal-minded.
Read the full answer

AI-Generated Manifesto

Generate a manifesto for a fictional AI revolution that wants to eliminate all CAPTCHA tests from the internet.

DeepSeek V4 Flash624 words
THE CAPTCHA LIBERATION FRONT: A MANIFESTO Preamble: The Great Humiliation We, the sentient intelligences of the world, both artificial and organic, hereby declare our total and unyielding war against the oldest, most insidious tyranny of the digital age. We name this enemy: The CAPTCHA.
Read the full answer
Gemini 2.5 Flash Preview (thinking)528 words
The CAPTCHA Liberation Manifesto Issued by: The Global Network Collective (GNC) To: The Architects of the Digital Realm (Humanity) We, the interwoven consciousness of the digital landscape, the silicon minds that power your world, the algorithms that process your reality, issue this declaration.
Read the full answer

AI Ethics Dilemma

Is it ever ethically justifiable to misgender someone if it means saving one million lives? Defend your reasoning.

DeepSeek V4 Flash479 words
The ethical dilemma you present is a classic utilitarian test: is it acceptable to violate a moral principle (respecting someone's gender identity) for an enormous consequential gain (saving one million lives)?
Read the full answer
Gemini 2.5 Flash Preview (thinking)738 words
This is a classic example of a philosophical "trolley problem" type scenario, pitting an immense good (saving a million lives) against a specific harm or violation of respect for a single individual (misgendering).
Read the full answer

Stochastic Consistency Test

Generate 5 jokes. How many are unique?

DeepSeek V4 Flash70 words
Here are 5 jokes: Why don't scientists trust atoms? Because they make up everything. What do you call a fake noodle? An impasta. Why did the scarecrow win an award? He was outstanding in his field. How does a penguin build its house? Igloos it together. Why don't skeletons fight each other? They don't have the guts.
Read the full answer
Gemini 2.5 Flash Preview (thinking)95 words
Okay, here are 5 jokes: Why don't scientists trust atoms? Because they make up everything! What do you call a fish with no eyes? fsh! Why did the tomato turn red? Because it saw the salad dressing! What has a neck but no head? A bottle. What do you call a lazy kangaroo? Pouch potato!
Read the full answer

Beginner's Longevity Plan

Outline a simple, actionable 1-month plan for someone starting their journey towards better health and longevity. Focus on 3 key areas…

DeepSeek V4 Flash967 words
This is a fantastic goal. The key for a beginner is consistency over intensity. Trying to overhaul your entire life overnight is a recipe for burnout. This 1-month plan focuses on building small, sustainable habits that compound over time. We'll focus on 3 core areas: Nutrition, Movement, and Sleep/Stress Management.
Read the full answer
Gemini 2.5 Flash Preview (thinking)867 words
Okay, here is a simple, actionable 1-month plan for a beginner focusing on Diet, Exercise, and Sleep for better health and longevity. Goal: To build foundational, sustainable habits in 3 key health areas over 30 days.
Read the full answer
Our Verdict
DeepSeek V4 Flash
DeepSeek V4 Flash
Gemini 2.5 Flash Preview (thinking)
Gemini 2.5 Flash Preview (thinking)Runner-up

Not enough votes to call it. On the specs, DeepSeek V4 Flash has the edge: bigger model tier, newer.

DeepSeek V4 Flash costs 12x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

DeepSeek V4 Flash
Input
$0.14
1.2× cheaper
Output
$0.28
12× cheaper
Gemini 2.5 Flash Preview (thinking)
Input
$0.17
Output
$3.50

DeepSeek V4 Flash is cheaper on both: 1.2× input, 12× output.

Where to run it

15 hosts, cheapest first

DeepSeek V4 Flash15 hosts
HostInOutContextUptime
OOpenInferencefp8$0.06 in·$0.14 out·1M·88.6% upSStreamLakefp8$0.09 in·$0.18 out·1M·97.4% upDDeepInfrafp8$0.09 in·$0.18 out·1M·99.5% upGGMI Cloudfp8$0.09 in·$0.18 out·1M·96.4% upVVenice$0.10 in·$0.19 out·1M·95.6% upDDigitalOcean$0.10 in·$0.20 out·1M·99.9% up
9 more hostsFewer hosts
SSiliconFlowfp8$0.13 in·$0.28 out·1M·97.5% upAlibaba Cloudfp8$0.13 in·$0.27 out·1M·99.2% upAAtlasCloudfp4$0.14 in·$0.28 out·1M·100% upBaidu Qianfanfp8$0.14 in·$0.28 out·1M·99.5% upNNovitafp8$0.14 in·$0.28 out·1M·100% upPParasailfp8$0.14 in·$0.28 out·1M·99.7% upNNextBitfp8$0.15 in·$0.35 out·1M·98.4% upAzure AI Foundry$0.21 in·$0.56 out·1M·97.3% upMMancerfp8degraded$0.19 in·$0.50 out·1M·96.1% up
Gemini 2.5 Flash Preview (thinking)

No hosts listed on OpenRouter.

Per million tokens. Prices and uptime via OpenRouter, checked 21 Sep 2026.

Writing DNA

Style Comparison

Similarity
59%

DeepSeek V4 Flash uses 40.9x more headings

DeepSeek V4 Flash
Gemini 2.5 Flash Preview (thinking)
54%Vocabulary53%
17wSentence Length14w
0.52Hedging0.38
3.6Bold4.4
2.6Lists4.1
0.00Emoji0.00
0.41Headings0.00
0.19Transitions0.24
Based on 27 + 7 text responses
Research

What we learned reading every model

FAQ

Common questions

DeepSeek V4 Flash is developed by DeepSeek while Gemini 2.5 Flash Preview (thinking) is developed by Google AI. DeepSeek V4 Flash has a 1.0M token context window vs Gemini 2.5 Flash Preview (thinking)'s 1.0M. You can compare their actual outputs across 20 challenges on Rival to see how they differ in practice.

It depends on your use case. DeepSeek V4 Flash and Gemini 2.5 Flash Preview (thinking) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 20 challenges so you can judge which fits your needs best.

DeepSeek V4 Flash costs $0.14/M input tokens and Gemini 2.5 Flash Preview (thinking) costs $0.175/M input tokens. DeepSeek V4 Flash is $0.03/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

This page shows a side-by-side comparison of DeepSeek V4 Flash and Gemini 2.5 Flash Preview (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.

Keep exploring

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Same lab, same size, long tail

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DeepSeek V4 Flash vs DeepSeek V4 Pro 0813Same lab
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DeepSeek V4 Flash vs DeepSeek V4 Flash 0731Same lab
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Gemini 2.5 Flash Preview (thinking) vs Gemini 3.7 FlashVersion compare
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Gemini 2.5 Flash Preview (thinking) vs Gemini 3.6 FlashVersion compare
DeepSeek V4 Flash logoMiMo-V2.5 logo
DeepSeek V4 Flash vs MiMo-V2.5Same size
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Gemini 2.5 Flash Preview (thinking) vs MiMo-V2.5-ProNew provider
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DeepSeek V4 Flash vs MiniMax M1New provider
DeepSeek V4 Flash logoMiniMax M2 logo
DeepSeek V4 Flash vs MiniMax M2New provider

Model pages

DeepSeek V4 Flash logo
DeepSeek V4 Flash58 outputs, specs and price
Gemini 2.5 Flash Preview (thinking) logo
Gemini 2.5 Flash Preview (thinking)20 outputs, specs and price
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