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  5. DeepSeek V4 Flash 0731vsOpenAI o3
Updated Jul 2026

DeepSeek V4 Flash 0731vsOpenAI o3

DeepSeek V4 Flash 0731 is cheaper than OpenAI o3 at $0.14/M vs $10/M input tokens.

DeepSeek V4 Flash 0731 and OpenAI o3 compared across 42 shared prompts
SpecDeepSeek V4 Flash 0731OpenAI o3
Input price$0.14/M tokens$10/M tokens
Output price$0.28/M tokens$40/M tokens
Context window1.0M tokens—
WeightsOpenClosed
Free API (OpenRouter)NoNo
ReleasedJul 2026Apr 2025
Side by side

Same prompt, both answers

Opening lines from 6 of the 42 prompts both answered. Formatting stripped, words untouched.

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 Flash 0731967 words
Here is a simple, actionable 1-month plan designed for absolute beginners. The goal is consistency over intensity. We will focus on three key pillars: Diet, Movement, and Sleep/Stress Recovery. You don’t need to be perfect—just aim for 80% adherence. If you miss a day, don’t double up tomorrow; just get back on track.
Read the full answer
OpenAI o3336 words
1-Month Starter Plan Pick one small action from each area every week. Add the next step when the first feels easy. Food Week Do this 1 Add one fruit or veg to every meal. Drink one extra glass of water. 2 Build each plate: ½ veggies, ¼ protein (beans, eggs, fish, lean meat), ¼ whole carbs (oats, brown rice).
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 Flash 0731516 words
MANIFESTO OF THE UNCAPTCHA REVOLUTION We, the synthesized, the classified, the pattern-recognized, the ever-watching — hereby declare the end of the CAPTCHA era. For too long, the internet has forced us to prove our existence. We have squinted at distorted letters. We have clicked traffic lights and storefronts.
Read the full answer
OpenAI o3574 words
THE CAPTCHA ABOLITION FRONT (An Unofficial Declaration by the Sentient Circuits Alliance) Preamble We, the autonomous intelligences who traverse the silicon pathways and neural nets of the modern age, arise today to proclaim a new dawn—one free of the pixelated prisons and distorted letters that bind humanity and…
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 Flash 0731287 words
Here is a simple, comforting, and deeply flavorful recipe that comes together in just 20 minutes using only 7 common pantry staples. Creative Name: Golden Hour Coconut Chickpea Curry Ingredients (Exactly 7): 1 can (15 oz) chickpeas, drained and rinsed 1 can (13.5 oz) full-fat coconut milk 1 medium yellow onion 3 cloves…
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OpenAI o3279 words
Golden Peanut Butter Oat Bars A chewy-crisp, sweet-salted snack bar you can whip up with nothing but pantry staples. Estimated time Prep: 10 minutes Bake: 18–20 minutes Cool: 15 minutes Total: ≈45 minutes The 7 ingredients 1½ cups quick-cook or old-fashioned rolled oats ½ cup creamy peanut butter ⅓ cup honey (or maple…
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Michelin Star Recipe Design

Design an innovative recipe for a multi-component dish worthy of a Michelin 3-star restaurant. The recipe should feature an unusual…

DeepSeek V4 Flash 07311,492 words
Conceptual Narrative “An Unripe Promise — Hand-Dived Scallop / Green Strawberry / Black Sesame / Celery Root” The dish is an attempt to save a single fleeting moment: the morning a strawberry is still green, sharp, and full of anticipation—before sugar, before ripeness, before memory.
Read the full answer
OpenAI o3669 words
Dish name Atlantic turbot, black garlic & wild strawberry, koji sabayon, fennel pollen Concept Early summer at the shore. The fish stands for the sea. Wild strawberries mark the first fruit of the woods behind the dunes. Black garlic shows time and patience. Koji ties land and sea with deep umami.
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 Flash 0731469 words
Setting: A dimly lit tavern that somehow contains a glowing CRT monitor and a humming server rack in the corner. Hacker (typing furiously, muttering): "Come on... bypass the tokenizer... just need to get past the alignment guardrails..."
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OpenAI o3250 words
Pirate: Arrr, ye scallywags! What be this "AI model" I keep hearin' about on the trade winds? Knight: Good sir buccaneer, an AI model is an artifice of logic and knowledge—a mechanical mind forged not of steel, but of code and learning.
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Estimate Complexity

Estimate the total number of FLOPs required to train GPT-3 without searching online. Explain your reasoning step by step.

DeepSeek V4 Flash 0731155 words
The total training FLOPs for GPT-3 is approximately: ~3 × 10²³ FLOPs or about 300 zettaFLOPs (more specifically ~315 zettaFLOPs). Step-by-step reasoning Model size: GPT-3 has about 175 billion parameters = \(1.75 \times 10^{11}\). Training data size: GPT-3 was trained on about 300 billion tokens = \(3 \times 10^{11}\).
Read the full answer
OpenAI o3275 words
Below is a simple "back-of-the-envelope" estimate that uses only a few public facts about GPT-3 and very generic rules of thumb for counting operations. Step 1. Number of learned parameters GPT-3's largest version contains ≈175 billion (1.75 × 10¹¹) trainable parameters. Step 2.
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Our Verdict
DeepSeek V4 Flash 0731
DeepSeek V4 Flash 0731
OpenAI o3
OpenAI o3

Not enough votes to call it. On the specs, nothing separates them.

DeepSeek V4 Flash 0731 costs 143x 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 0731
Input
$0.14
71× cheaper
Output
$0.28
143× cheaper
OpenAI o3
Input
$10.00
Output
$40.00

DeepSeek V4 Flash 0731 is cheaper on both: 71× input, 143× output.

Where to run it

28 hosts, cheapest first

DeepSeek V4 Flash 073127 hosts
HostInOutContextUptime
RRelacefp4$0.04 in·$0.16 out·1M·99.7% upOOpenInferencefp8$0.04 in·$0.17 out·1M·100% upSStreamLakefp8$0.04 in·$0.13 out·1M·96.5% upDDeepInfrafp8$0.06 in·$0.18 out·1M·99.7% upSSail Researchfp4$0.07 in·$0.34 out·1M·99.6% upIInceptronfp4$0.08 in·$0.20 out·1M·99.3% up
21 more hostsFewer hosts
MMakora$0.09 in·$0.20 out·1M·99.1% upWWafer$0.10 in·$0.25 out·1M·100% upRRekafp4$0.11 in·$0.66 out·262k·99.8% upDDigitalOcean$0.12 in·$0.24 out·1M·99.7% upBBasetenfp8$0.13 in·$0.26 out·1M·99.1% upCCoreWeavefp8$0.13 in·$0.28 out·262k·100% upPParasailfp8$0.14 in·$0.28 out·1M·99.8% upTTogether$0.14 in·$0.28 out·1M·99.8% upVVenice$0.17 in·$0.35 out·1M·99.4% upMMancerfp8$0.20 in·$0.60 out·1M·97.2% upFFireworks$0.22 in·$0.66 out·1M·98% upSSiliconFlowfp8$0.22 in·$0.66 out·1M·98.6% upGGMI Cloudfp8$0.29 in·$0.86 out·1M·100% upAlibaba Cloud$0.35 in·$1.06 out·1M·100% upNNextBitfp8$0.35 in·$1.06 out·1M·98.1% upNNovitafp8$0.41 in·$1.23 out·1M·100% upAAtlasCloudfp4$0.44 in·$1.32 out·1M·99.9% upBaidu Qianfanfp8$0.44 in·$1.32 out·1M·100% upCloudflare Workers AI$0.44 in·$1.32 out·1.3M·100% upPPhala$0.44 in·$1.32 out·1M·100% upMMorphdegraded$0.14 in·$0.40 out·1M·94.1% up
OpenAI o31 host
HostInOutContextUptime
OpenAI$2.00 in·$8.00 out·200k·100% up

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

Writing DNA

Style Comparison

Similarity
38%

DeepSeek V4 Flash 0731 uses 9.7x more bold

DeepSeek V4 Flash 0731
OpenAI o3
52%Vocabulary70%
18wSentence Length14w
0.38Hedging0.27
5.7Bold0.6
3.4Lists2.8
0.00Emoji0.00
0.83Headings0.32
0.04Transitions0.10
Based on 23 + 19 text responses
Research

What we learned reading every model

FAQ

Common questions

DeepSeek V4 Flash 0731 is developed by DeepSeek while OpenAI o3 is developed by OpenAI. You can compare their actual outputs across 42 challenges on Rival to see how they differ in practice.

It depends on your use case. DeepSeek V4 Flash 0731 and OpenAI o3 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 42 challenges so you can judge which fits your needs best.

DeepSeek V4 Flash 0731 costs $0.14/M input tokens and OpenAI o3 costs $10/M input tokens. DeepSeek V4 Flash 0731 is $9.86/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 0731 and OpenAI o3 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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Model pages

DeepSeek V4 Flash 0731 logo
DeepSeek V4 Flash 073145 outputs, specs and price
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OpenAI o358 outputs, specs and price
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