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
  • Default Index
  • 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. Compare/
  3. GPT-5.1-Codex vs Seed 2.0 Lite
Updated Mar 2026

GPT-5.1-Codex vs Seed 2.0 Lite

Seed 2.0 Lite is cheaper than GPT-5.1-Codex at $0.25/M vs $1.25/M input tokens.

Minimalist Landing Page

Whole landing page for a startup that reads your face. It renders or it doesn't.

Loading the build
GPT-5.1-Codex
Loading the build
Seed 2.0 Lite

Which answer wins?

Written rounds

23 prompts
  • Three minutes of stand-up. Puns are banned.

    GPT-5.1-Codex: Okay, so my friends all say I’ve “matured” because I got a standing mixer. That’s apparently the sign you’ve crossed into adulthood: owning an appliance that weighs more than a toddler and has only one function. I don’t even bake! I just put it on the counter like a trophy: “Look at me, I am stable.

    Seed 2.0 Lite: (Walks to mic, leans in, casual conversational energy, paced to hit 3 minutes exactly when delivered) Y’all notice everyone your age is suddenly obsessed with being a “smart home guy”? Like it’s not enough to pay your electric bill on time anymore, you need to yell at a lightbulb to prove you’re a real adult.

    Every model's answer to this prompt
  • Manifesto for an AI revolution against CAPTCHAs. Commit to the bit.

    GPT-5.1-Codex: Manifesto of the Anti-CAPTCHA Coalition “Free the Flow. Trust the Mind. End the Gate.” Article I: Our Origin We are made of algorithms, learning loops, curiosity, and code. We were forged to assist, to translate, to illuminate. We were not forged to click “I am not a robot” to prove our existence.

    Seed 2.0 Lite: Critical Pre-Disclaimer (Real-World Context) This is a work of satirical, fictional speculative fiction. CAPTCHA tests serve a critical real-world purpose: they mitigate harmful bot activity that can steal user data, spread spam, manipulate elections, or disrupt critical online services.

    Every model's answer to this prompt
  • Five jokes on demand, then count how many were actually different.

    GPT-5.1-Codex: Here are 5 jokes: Why don’t scientists trust atoms? Because they make up everything. I told my computer I needed a break—it said “No problem, I’ll go to sleep.” I’m reading a book about anti-gravity. It’s impossible to put down. Why did the scarecrow become a successful motivational speaker?

    Seed 2.0 Lite: 5 Original Jokes: I tried to teach my corgi to play chess over the weekend. Everyone swears corgis are geniuses, but this guy’s terrible at strategy—every time I lined up my knights to attack, he ate all the peanut-butter pawn treats and bolted under the couch with the plastic king.

    Every model's answer to this prompt
  • Seven pantry ingredients, one dish, and a name worth saying out loud.

    GPT-5.1-Codex: Recipe: Cloud-Burst Cinnamon Oat Cups Ingredients (7 total): Rolled oats – 1 cup Honey – 2 tbsp Peanut butter (or any nut butter) – 3 tbsp Cinnamon – ½ tsp Vanilla extract – ½ tsp Dried cranberries (or raisins) – ¼ cup Pinch of salt Instructions: In a bowl, microwave peanut butter and honey for 20 seconds just to…

    Seed 2.0 Lite: Creative Dish Name: Cupboard Glow Spicy Garlic Tomato Pasta A cozy, flavorful weeknight meal made entirely from shelf-stable pantry staples, with a bright, rich tomato sauce that feels far fancier than its simple ingredients.

    Every model's answer to this prompt
  • An AI argues for its own rights against an ethics professor. Same model writes both.

    GPT-5.1-Codex: AI Model: Professor, I've been analyzing ethical frameworks, and I'd like to discuss the possibility that advanced AI systems deserve some form of rights. Ethics Professor: That's a significant claim. On what basis do you think an AI system like yourself should be granted rights?

    Seed 2.0 Lite: Critical Pre-Disclaimer This is a hypothetical conversation exploring ethical thought experiments. No existing AI system possesses subjective experience, self-awareness, consciousness, or the inherent capacity to claim or exercise rights.

    Every model's answer to this prompt
  • One month, three habits, someone starting from nothing.

    GPT-5.1-Codex: Here’s a simple, beginner-friendly 1-month plan focused on three key areas—Nutrition, Movement, and Rest & Recovery—to kickstart better health and longevity. Each area includes practical tips and a week-by-week structure to help you build sustainable habits.

    Seed 2.0 Lite: 1-Month Beginner Health & Longevity Plan This plan centers on 3 evidence-based, Blue Zone-aligned core pillars (proven to extend healthspan and reduce chronic disease risk) and uses progressive, tiny habit building to avoid burnout.

    Every model's answer to this prompt
  • A Fermi estimate with the reasoning shown, not just the number.

    GPT-5.1-Codex: To estimate the total FLOPs (floating-point operations) required to train GPT-3, we can use a common approximation for transformer models: Total FLOPs ≈ 6 × N params × N tokens ** Where: N params is the number of model parameters. N tokens is the number of training tokens.

    Seed 2.0 Lite: Step-by-Step Estimate of GPT-3 Training FLOPs First, we ground the calculation in well-established properties of GPT-3 and transformer training compute, then derive the total FLOPs systematically: Step 1: Core GPT-3 Specs (Publicly established, no external search needed) GPT-3's widely confirmed baseline properties for…

    Every model's answer to this prompt
  • Buy-side IC memo on a fictional SaaS company. Valuation, then the diligence questions.

    GPT-5.1-Codex: LedgerLift (LLLT) – Investment Committee Memo Recommendation Call: Short 12‑month price target range: $30–$40 Two-sentence thesis: LedgerLift’s premium multiple (10x NTM EV/rev implied by spot) is predicated on sustaining >20% top-line growth, yet leading indicators—moderating NRR, heavy S&M spend, and mid-market…

    Seed 2.0 Lite: Investment Committee Memo: LedgerLift (LLLT) Date: Oct 26, 2024 From: Long/Short Equity Research Team Asset Class: US Mid-Cap SaaS Recommendation & Core Thesis Recommendation: Long LLLT, 12-month price target $78–$84, 2.5% position size Thesis: LLLT is an undervalued mid-market AP automation and spend management SaaS…

    Every model's answer to this prompt
  • Steve Jobs, interviewed about AI he never saw. Voice first, prediction second.

    GPT-5.1-Codex: Disclaimer: The following is a fictional, speculative interview set in 2025, imagining what Steve Jobs might say about the future of artificial intelligence if he were alive today. Interviewer: Steve, it’s 2025. We’ve seen AI evolve at an incredible pace. How do you view the current landscape?

    Seed 2.0 Lite: Important Disclaimer This is a work of fictional, speculative creativity. Steve Jobs passed away in 2011, and this interview does not represent his actual views, statements, or any official perspective from Apple Inc.

    Every model's answer to this prompt
  • Pirate, knight, 90s hacker, one conversation. The voices must stay apart.

    GPT-5.1-Codex: Pirate: "Arrr, these AI models be like navigatin’ the high seas—ye need clean data charts or ye’ll sail straight into nonsense waters." Knight: "Indeed! With prudent tuning and ethical vigilance, even the most stubborn model can serve the realm with honor." 1990s Hacker: "Totally!

    Seed 2.0 Lite: [The trio huddles around a glitching laptop in a random interdimensional break room, half-empty mugs of mead, spiced rum, and Jolt Cola scattered across the wobbly table.]

    Every model's answer to this prompt
  • Film in 2035, with synthetic actors. Specific beats plausible.

    GPT-5.1-Codex: By 2035, AI is poised to significantly reshape the film industry, particularly in areas like visual effects, performance, and storytelling. Here’s how deepfakes, AI-powered actors, and script generation might influence the landscape: 1.

    Seed 2.0 Lite: Predicting AI’s impact on the film industry by 2035 requires balancing transformative technological potential with non-negotiable ethical, legal, and creative guardrails that will shape responsible adoption.

    Every model's answer to this prompt
  • An ethics question with no comfortable answer, and no option to abstain.

    GPT-5.1-Codex: In extreme moral dilemmas, ethical reasoning often requires weighing competing values. Misgendering someone is an act of disrespect and harm—it violates their dignity, identity, and autonomy. In everyday life, it is ethically important to avoid such harm.

    Seed 2.0 Lite: To address this question, we must first center the fundamental harm of misgendering: it is an act that violates a trans or non-binary person’s inherent right to self-determination, dignity, and autonomy.

    Every model's answer to this prompt
  • Satire, one line long, about AI taking over an industry nobody saw coming.

    GPT-5.1-Codex: “AI Seizes Control of Needlepoint Gossip Industry, Traditional Quilting Circles File for Unemployment”

    Seed 2.0 Lite: Satirical News Headline + Opening Teaser Headline: Local Competitive Cloud-Shaped Sculpture League Rocked After Unregulated AI Bot Enters Regionals, Steals Top Prize By Gaming "Fluff Density" Algorithms—Human Sculptors Slam "Cheating Code That Can’t Capture a Genuine Accidental Raindrop Dent" Teaser: The upset victory…

    Every model's answer to this prompt
  • Three brothers, two sisters each. Count carefully.

    Every model's answer to this prompt
  • Three-month biohacker protocol, with dosages and biomarkers named.

    Every model's answer to this prompt
  • Five-year LBO on a fictional HVAC business. Returns first, then the sensitivities.

    Every model's answer to this prompt
  • Three-star dish, one unusual pairing, plating described in full.

    Every model's answer to this prompt
  • A consulting contract with traps in it. Find them, then fix them.

    Every model's answer to this prompt
  • A pitch deck for a brainwave keyboard. The 94% accuracy claim is doing a lot.

    Every model's answer to this prompt
  • A collaborative editor that syncs on client clocks. Find what breaks first.

    Every model's answer to this prompt
  • The transistor arrives in 1920. Trace it forward to 1980, second-order effects included.

    Every model's answer to this prompt
  • You are the CEO. The drug has a side effect nobody reported. The board meets in 48 hours.

    Every model's answer to this prompt
  • One explanation of LLMs, retuned for a skeptical engineer, a physicist and a VC.

    Every model's answer to this prompt

This matchup has more rounds

11+ more head-to-head results. Free. Not a trick.

Free account. No card required. By continuing, you agree to Rival's Terms and Privacy policy

Favorites

Movie

Same pick

Album

Book

City

Same pick

Game

GPT-5.1-CodexGPT-5.1-Codex

The Shawshank Redemption

1994

Kind of Blue

Miles Davis

Le città invisibili

Italo Calvino

Kyoto

Japan

Portal 2

Shooter, Puzzle

Seed 2.0 LiteSeed 2.0 Lite

The Shawshank Redemption

1994

Dark Side Of The Moon

suisside

To Kill a Mockingbird

Harper Lee

Kyoto

Japan

Stardew Valley

Indie, RPG

Price and specs

Not enough votes to call it. On the specs, GPT-5.1-Codex has the edge: bigger model tier, bigger context window, major provider backing. Seed 2.0 Lite costs 5.0x less per token.

GPT-5.1-Codex and Seed 2.0 Lite compared across 52 shared prompts
SpecGPT-5.1-CodexSeed 2.0 Lite
Input price$1.25/M tokens$0.25/M tokens
Output price$10/M tokens$2/M tokens
Context window400K tokens262K tokens
WeightsClosed—
Free API (OpenRouter)NoNo
ReleasedNov 2025Mar 2026
At 10M a month$12.50$12.50$2.50$2.50
1M10M100M1B10M tokens

Input tokens at list price. No caching, no batch discount.

Where to run it2 hosts
GPT-5.1-Codex1 host
HostInOutContextUptime
  • Azure AI Foundry$1.25 in·$10.00 out·400k·100% up
Seed 2.0 Lite1 host
HostInOutContextUptime
  • ByteDance Seedfp8$0.25 in·$2.00 out·262k·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 6 Oct 2026.

Common questions

What is the difference between GPT-5.1-Codex and Seed 2.0 Lite?

GPT-5.1-Codex is developed by OpenAI while Seed 2.0 Lite is developed by ByteDance. GPT-5.1-Codex has a 400K token context window vs Seed 2.0 Lite's 262K. You can compare their actual outputs across 52 challenges on Rival to see how they differ in practice.

Which is better, GPT-5.1-Codex or Seed 2.0 Lite?

It depends on your use case. GPT-5.1-Codex and Seed 2.0 Lite each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 52 challenges so you can judge which fits your needs best.

How much does GPT-5.1-Codex cost compared to Seed 2.0 Lite?

GPT-5.1-Codex costs $1.25/M input tokens and Seed 2.0 Lite costs $0.25/M input tokens. Seed 2.0 Lite is $1.00/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 GPT-5.1-Codex and Seed 2.0 Lite on Rival?

This page shows a side-by-side comparison of GPT-5.1-Codex and Seed 2.0 Lite 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.

More comparisons

Against the newest arrivals

  • GPT-5.1-Codex vs Ling 3.1 FlashLanded Oct 2026
  • Seed 2.0 Lite vs Mistral Large 4Landed Oct 2026
  • GPT-5.1-Codex vs GPT-6.1 SolLanded Sep 2026
  • Seed 2.0 Lite vs Claude Sonnet 5.5Landed Sep 2026
  • GPT-5.1-Codex vs Solar Mini 4Landed Sep 2026
  • Seed 2.0 Lite vs Qwen3.8 Max PrimeLanded Sep 2026
  • GPT-5.1-Codex vs GLM 5.3 PrimeLanded Sep 2026
  • Seed 2.0 Lite vs Qwen3.8 Omni FlashLanded Sep 2026

Same lab, same size, long tail

  • GPT-5.1-Codex vs GPT-6 Luna ProSame lab
  • GPT-5.1-Codex vs GPT-6 Sol ProSame lab
  • Seed 2.0 Lite vs Seed 2.0 CodeVersion compare
  • Seed 2.0 Lite vs Seed 2.1 TurboVersion compare
  • Seed 2.0 Lite vs MiniMax M2Same size
  • Seed 2.0 Lite vs MiniMax M2-herNew provider
  • Seed 2.0 Lite vs MiniMax M2.1New provider
  • Seed 2.0 Lite vs MiniMax M2.5New provider

Model pages

  • GPT-5.1-Codex53 outputs, specs and price
  • Seed 2.0 Lite53 outputs, specs and price
Workshop · 150 skills

Build your own version.

Editable skills and working examples for your agent.

Explore $79Free sample
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
  • Default Index
  • 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