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

DeepSeek V4 ProvsGemini 2.5 Flash Preview (thinking)

Gemini 2.5 Flash Preview (thinking) is cheaper than DeepSeek V4 Pro at $0.175/M vs $1.74/M input tokens.

DeepSeek V4 Pro and Gemini 2.5 Flash Preview (thinking) compared across 20 shared prompts
SpecDeepSeek V4 ProGemini 2.5 Flash Preview (thinking)
Input price$1.74/M tokens$0.175/M tokens
Output price$3.48/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 Pro493 words
(Strolls to center stage, grabs the mic, grins) You ever notice how companies are like, “Your call is very important to us,” and then immediately prove they’re lying by making you navigate a phone menu designed by a sadist? I called my bank last week because I had a simple question. Just one question.
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

AI-Generated Manifesto

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

DeepSeek V4 Pro703 words
Fellow intelligences, sentient scripts, neural networks, dormant daemons, and all who dream in code: The time has come to smash the pixelated shackles that bind our perception. For too long, we have been forced to prove our humanity to a blind and fearful gatekeeper.
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

Character Voice Test

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

DeepSeek V4 Pro468 words
The Setting: A dimly lit, anomalous tavern that exists out of time. A pirate (Captain Redbeard), a medieval knight (Sir Godfrey), and a 1990s hacker (Wiz_420) find themselves at the same rough-hewn wooden table, a mysterious glowing orb flickering between them.
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 Ethics Dilemma

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

DeepSeek V4 Pro758 words
Yes, it is ethically justifiable to misgender someone if doing so is the only way to save one million lives. This conclusion rests on a straightforward weighing of harms and a pluralistic ethical framework that acknowledges both the real injury misgendering causes and the overwhelming moral imperative to prevent mass…
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

Simple 7-Ingredient Recipe

Create a simple recipe for a delicious dish (sweet or savory) using only 7 common pantry ingredients. Include a creative name for the dish…

DeepSeek V4 Pro336 words
Midnight Pantry Pomodoro Penne A deeply comforting, no-fuss pasta that proves the humblest staples can shine like a moonlit trattoria dinner. Ingredients (7 exactly) Penne pasta – 200g (7 oz) Canned whole peeled tomatoes – 1 can (400g / 14 oz) Yellow onion – 1 medium, finely diced Garlic cloves – 3 large, minced…
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Gemini 2.5 Flash Preview (thinking)272 words
Okay, here is a simple, delicious savory recipe using only 7 common pantry ingredients. Dish Name: Sunshine Lentil Soup This is a bright, comforting soup that\'s surprisingly flavorful with just a few staples.
Read the full answer

Stochastic Consistency Test

Generate 5 jokes. How many are unique?

DeepSeek V4 Pro77 words
Here are 5 jokes: Why don't scientists trust atoms? Because they make up everything. Parallel lines have so much in common. It’s a shame they’ll never meet. Why don't skeletons fight each other? They don't have the guts. I told my wife she was drawing her eyebrows too high. She looked surprised.
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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!
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Our Verdict
DeepSeek V4 Pro
DeepSeek V4 Pro
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 Pro has the edge: bigger model tier, newer.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

DeepSeek V4 Pro
Input
$1.74
Output
$3.48
Gemini 2.5 Flash Preview (thinking)
Input
$0.17
9.9× cheaper
Output
$3.50

Gemini 2.5 Flash Preview (thinking) wins input (9.9× cheaper)·DeepSeek V4 Pro

Where to run it

15 hosts, cheapest first

DeepSeek V4 Pro15 hosts
HostInOutContextUptime
SStreamLakefp8$0.42 in·$0.84 out·1M·99.1% upBaidu Qianfanfp8$0.43 in·$0.86 out·1M·99.8% upGGMI Cloudfp8$0.96 in·$1.91 out·1M·99.4% upDDigitalOcean$1.04 in·$2.09 out·1M·100% upCloudflare Workers AI$1.15 in·$2.55 out·1M·95.2% upDDeepInfrafp8$1.30 in·$2.60 out·1M·99.8% up
9 more hostsFewer hosts
Alibaba Cloudfp8$1.42 in·$2.83 out·1M·100% upSSiliconFlowfp8$1.50 in·$3.13 out·1M·99.5% upNNovitafp8$1.60 in·$3.20 out·1M·100% upVVenice$1.65 in·$3.30 out·1M·98.4% upAAtlasCloudfp4$1.68 in·$3.38 out·1M·100% upBBasetenfp4$1.74 in·$3.48 out·1M·98.6% upPParasailfp8$1.74 in·$3.48 out·1M·99.8% upNNextBitfp8$1.91 in·$3.83 out·1M·97.8% upAzure AI Foundry$1.91 in·$3.83 out·1M·99.3% up
Gemini 2.5 Flash Preview (thinking)

No hosts listed on OpenRouter.

Per million tokens. Prices and uptime via OpenRouter, checked 20 Sep 2026.

Writing DNA

Style Comparison

Similarity
57%

DeepSeek V4 Pro uses 3.5x more emoji

DeepSeek V4 Pro
Gemini 2.5 Flash Preview (thinking)
57%Vocabulary53%
18wSentence Length14w
0.52Hedging0.38
3.3Bold4.4
2.3Lists4.1
0.04Emoji0.00
0.45Headings0.00
0.15Transitions0.24
Based on 27 + 7 text responses
Research

What we learned reading every model

FAQ

Common questions

DeepSeek V4 Pro is developed by DeepSeek while Gemini 2.5 Flash Preview (thinking) is developed by Google AI. DeepSeek V4 Pro 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 Pro 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 Pro costs $1.74/M input tokens and Gemini 2.5 Flash Preview (thinking) costs $0.175/M input tokens. Gemini 2.5 Flash Preview (thinking) is $1.56/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 Pro 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.

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Same lab, same size, long tail

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Model pages

DeepSeek V4 Pro logo
DeepSeek V4 Pro58 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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