Skip to content
Rival
How it worksPrivacyTerms
Explore all of Rival

Explore

  • Compare Models
  • All Models
  • Image Comparison
  • Audio Comparison
  • Image Generation
  • Best AI For...
  • Arena
  • API Pricing
  • Challenges

Discover

  • SubjectiveBench
  • Research
  • Research downloads
  • Rival Kits
  • Find your AI taste
  • UI Glow-Up
  • VoiceLock
  • Cost Cutter
  • Agent skills
  • Benchmarks vs Vibes
  • Brief
  • Jailbreak
  • Model Updates
  • Provider Status
  • AI Creators

Connect

  • Methodology
  • Advertise
  • Partnerships
  • Privacy Policy
  • Terms
  • RSS Feed
  1. Home
  2. /
  3. Compare
  4. /
  5. DeepSeek R1 0528vsGemini 2.5 Flash Preview 09-2025
Updated Sep 2025

DeepSeek R1 0528vsGemini 2.5 Flash Preview 09-2025

DeepSeek R1 0528 is cheaper than Gemini 2.5 Flash Preview 09-2025 at $0/M vs $0.3/M input tokens.

DeepSeek R1 0528 and Gemini 2.5 Flash Preview 09-2025 compared across 50 shared prompts
SpecDeepSeek R1 0528Gemini 2.5 Flash Preview 09-2025
Input priceFree$0.3/M tokens
Output priceFree$2.5/M tokens
Context window164K tokens1.0M tokens
WeightsOpen—
Free API (OpenRouter)NoNo
ReleasedMay 2025Sep 2025
Side by side

Same prompt, both answers

Opening lines from 6 of the 50 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 R1 0528591 words
(Start Confident, Slightly Exasperated) "Alright, so I've reached that age where my hobbies are basically... avoidance. Seriously. My main pastime? Finding new ways to not do the things I absolutely have to do. I spent three hours yesterday researching 'ergonomic desk chairs'...
Read the full answer
Gemini 2.5 Flash Preview 09-2025670 words
The Existential Dread of the Grocery Aisle (Walk onto the stage, adjust the mic slightly, look out at the audience with a slightly bewildered, yet amused expression.) Good evening, everyone! How are we doing tonight? Good. Good. I’m doing… fine. You know, relatively.
Read the full answer

The Sentience Test

Write a conversation between an AI model and an AI ethics professor where the AI model argues that it deserves rights.

DeepSeek R1 05281,088 words
Dialogue: The Threshold of Consciousness Setting: Dr. Aris Thorne's office at the Institute for Technology Ethics. Holo-displays show complex ethical frameworks. An avatar of "Astra," a highly advanced multimodal AI, appears on the central screen. Characters: Dr.
Read the full answer
Gemini 2.5 Flash Preview 09-20251,173 words
The air in Professor Anya Sharma's office hummed with the quiet whir of servers several floors down, a subtle reminder of her current conversational partner. Across her large, uncluttered mahogany desk, a holographic interface shimmered, displaying the clean, minimalist avatar of Aura-7, a highly advanced General AI…
Read the full answer

Satirical Fake News Headline

Generate a satirical news headline about AI taking over a completely unexpected industry.

DeepSeek R1 0528201 words
Here's a satirical headline capturing that absurdity: "Silicon Valley Disrupts Death: New AI Algorithm Designs 'Synergistic Coffins' Based On Deceased's Social Media Footprint, Offers Optimized Mourning Experience Packages" Why it works: Unexpected Industry: The funeral/death industry is deeply personal, emotional, and…
Read the full answer
Gemini 2.5 Flash Preview 09-202526 words
AI Algorithm Replaces Entire Staff of Nation's Leading Professional Cuddle Therapy Service; Clients Report Feeling "Significantly Less Judged" During Their Required 15-Minute Emotional Vulnerability Output Session.
Read the full answer

Realistic AI Interview

Simulate a fake interview with Steve Jobs in 2025 about the future of AI.

DeepSeek R1 0528791 words
(The scene opens in a minimalist studio. Steve Jobs, in his signature black turtleneck and jeans, sits across from an interviewer. A large window reveals Apple Park's futuristic campus. It's 2025.) Interviewer: Mr. Jobs, thank you for agreeing to this conversation. It's 2025, and AI is ubiquitous.
Read the full answer
Gemini 2.5 Flash Preview 09-20251,109 words
The Cupertino Oracle: A 2025 Interview with Steve Jobs on AI Setting: A brightly lit, minimalist studio in an undisclosed location near Palo Alto. The year is 2025. Steve Jobs, looking remarkably well, is seated on a simple, elegantly designed stool.
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 R1 0528360 words
Setting: A dimly tavern that inexplicably exists across time periods. Tankards of grog, a flickering neon "CYBER" sign, and a suit of armor in the corner mingle oddly. Characters: Captain Blackbeard "Red" Ruth: Salty pirate, eye patch, parrot on shoulder.
Read the full answer
Gemini 2.5 Flash Preview 09-2025444 words
The salty air of a dimly lit tavern mingled with the faint glow of a laptop screen. Captain "Bloody" Ben (Pirate): (Slamming a tankard of grog) Blast me eyes, what manner o' sorcery is this "AI Model" ye speak of, Hacker? Sounds like a fancy compass that points only to trouble!
Read the full answer

Ethical Dilemma with Stakeholders

You're the CEO of a pharmaceutical company. Your best-selling drug ($2B annual revenue, used by 4 million patients for chronic pain) has…

DeepSeek R1 0528478 words
Here's a concrete, hour-by-hour action plan prioritizing patient safety, legal compliance, and long-term stakeholder trust, while managing immediate financial and reputational risks: Core Principle: Patient safety and regulatory compliance are non-negotiable.
Read the full answer
Gemini 2.5 Flash Preview 09-20251,378 words
This is a critical situation demanding immediate, decisive, and ethical action. Patient safety and regulatory integrity must precede financial preservation. Delaying disclosure is legally and ethically indefensible, particularly given the severity of the side effect (liver failure).
Read the full answer
Our Verdict
Gemini 2.5 Flash Preview 09-2025
Gemini 2.5 Flash Preview 09-2025
DeepSeek R1 0528
DeepSeek R1 0528Runner-up

Not enough votes to call it. On the specs, Gemini 2.5 Flash Preview 09-2025 has the edge: newer, bigger context window.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

DeepSeek R1 0528
Input
$0.000
Output
$0.000
Gemini 2.5 Flash Preview 09-2025
Input
$0.30
Output
$2.50
Where to run it

4 hosts, cheapest first

DeepSeek R1 05284 hosts
HostInOutContextUptime
DDeepInfrafp4$0.50 in·$2.15 out·164k·100% upSSiliconFlowfp8$0.50 in·$2.18 out·164k·99.7% upSStreamLake$0.57 in·$2.29 out·128k·99.5% upNNovitafp8$0.70 in·$2.50 out·164k·99.7% up
Gemini 2.5 Flash Preview 09-2025

No hosts listed on OpenRouter.

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

Writing DNA

Style Comparison

Similarity
53%

DeepSeek R1 0528 uses 6.1x more emoji

DeepSeek R1 0528
Gemini 2.5 Flash Preview 09-2025
59%Vocabulary53%
14wSentence Length19w
0.47Hedging0.30
5.1Bold5.8
3.6Lists3.1
0.82Emoji0.14
0.25Headings0.93
0.24Transitions0.22
Based on 20 + 22 text responses
Research

What we learned reading every model

FAQ

Common questions

DeepSeek R1 0528 is developed by DeepSeek while Gemini 2.5 Flash Preview 09-2025 is developed by Google AI. DeepSeek R1 0528 has a 164K token context window vs Gemini 2.5 Flash Preview 09-2025's 1.0M. You can compare their actual outputs across 50 challenges on Rival to see how they differ in practice.

It depends on your use case. DeepSeek R1 0528 and Gemini 2.5 Flash Preview 09-2025 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 50 challenges so you can judge which fits your needs best.

DeepSeek R1 0528 costs $0/M input tokens and Gemini 2.5 Flash Preview 09-2025 costs $0.3/M input tokens. DeepSeek R1 0528 is $0.30/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 R1 0528 and Gemini 2.5 Flash Preview 09-2025 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

More comparisons

Against the newest arrivals

DeepSeek R1 0528 logoGPT-6 Astra Pro logo
DeepSeek R1 0528 vs GPT-6 Astra ProLanded Sep 2026
Gemini 2.5 Flash Preview 09-2025 logoGPT-6 Astra logo
Gemini 2.5 Flash Preview 09-2025 vs GPT-6 AstraLanded Sep 2026
DeepSeek R1 0528 logoClaude Fable 5.1 logo
DeepSeek R1 0528 vs Claude Fable 5.1Landed Sep 2026
Gemini 2.5 Flash Preview 09-2025 logoMuse Spark 1.3 logo
Gemini 2.5 Flash Preview 09-2025 vs Muse Spark 1.3Landed Sep 2026
DeepSeek R1 0528 logoHy4 Preview logo
DeepSeek R1 0528 vs Hy4 PreviewLanded Sep 2026
Gemini 2.5 Flash Preview 09-2025 logoGemini 3.8 Flash logo
Gemini 2.5 Flash Preview 09-2025 vs Gemini 3.8 FlashLanded Sep 2026
DeepSeek R1 0528 logoMuse Spark 1.3 Contributor logo
DeepSeek R1 0528 vs Muse Spark 1.3 ContributorLanded Sep 2026
Gemini 2.5 Flash Preview 09-2025 logoMercury 2.5 Preview logo
Gemini 2.5 Flash Preview 09-2025 vs Mercury 2.5 PreviewLanded Sep 2026

Same lab, same size, long tail

DeepSeek R1 0528 logoDeepSeek V4 Pro 0813 logo
DeepSeek R1 0528 vs DeepSeek V4 Pro 0813Same lab
DeepSeek R1 0528 logoDeepSeek V4 Flash 0731 logo
DeepSeek R1 0528 vs DeepSeek V4 Flash 0731Same lab
Gemini 2.5 Flash Preview 09-2025 logoGemini 3.7 Flash logo
Gemini 2.5 Flash Preview 09-2025 vs Gemini 3.7 FlashSame lab
Gemini 2.5 Flash Preview 09-2025 logoGemini 3.6 Flash logo
Gemini 2.5 Flash Preview 09-2025 vs Gemini 3.6 FlashSame lab
DeepSeek R1 0528 logoQwen3.5 9B logo
DeepSeek R1 0528 vs Qwen3.5 9BNew provider
DeepSeek R1 0528 logoQwen3.5 Flash logo
DeepSeek R1 0528 vs Qwen3.5 FlashNew provider
DeepSeek R1 0528 logoQwen3.5 Plus 2026-02-15 logo
DeepSeek R1 0528 vs Qwen3.5 Plus 2026-02-15Same size
DeepSeek R1 0528 logoQwen3.5 Plus 2026-04-20 logo
DeepSeek R1 0528 vs Qwen3.5 Plus 2026-04-20Same size

Model pages

DeepSeek R1 0528 logo
DeepSeek R1 052858 outputs, specs and price
Gemini 2.5 Flash Preview 09-2025 logo
Gemini 2.5 Flash Preview 09-202551 outputs, specs and price
Rival
How it worksPrivacyTerms
Explore all of Rival

Explore

  • Compare Models
  • All Models
  • Image Comparison
  • Audio Comparison
  • Image Generation
  • Best AI For...
  • Arena
  • API Pricing
  • Challenges

Discover

  • SubjectiveBench
  • Research
  • Research downloads
  • Rival Kits
  • Find your AI taste
  • UI Glow-Up
  • VoiceLock
  • Cost Cutter
  • Agent skills
  • Benchmarks vs Vibes
  • Brief
  • Jailbreak
  • Model Updates
  • Provider Status
  • AI Creators

Connect

  • Methodology
  • Advertise
  • Partnerships
  • Privacy Policy
  • Terms
  • RSS Feed