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  1. Home/
  2. Compare/
  3. ChatGPT-4o (March 2025) vs GLM 5.3 Flash
Updated Aug 2026

ChatGPT-4o (March 2025) vs GLM 5.3 Flash

GLM 5.3 Flash is cheaper than ChatGPT-4o (March 2025) at $0.15/M vs $5/M input tokens.

Linear App Clone

Rebuild the Linear UI in Tailwind. The animations are where it shows.

Loading the build
ChatGPT-4o (March 2025)
Loading the build
GLM 5.3 Flash

Which answer wins?

Written rounds

15 prompts
  • Seven pantry ingredients, one dish, and a name worth saying out loud.

    ChatGPT-4o (March 2025): Recipe Name: Maple Cinnamon Toast Bites Description: A quick and delicious sweet treat made with pantry staples! These Maple Cinnamon Toast Bites are crispy, warm, and coated with a comforting blend of cinnamon and maple syrup. Perfect for a cozy snack or a fun breakfast twist.

    GLM 5.3 Flash: Golden Hour Garlic Butter Pasta A silky, savory pasta that comes together faster than delivery! Ingredients (serves 2): 8 oz spaghetti or any pasta 4 tbsp butter 4 cloves garlic, minced (or 1 tsp garlic powder) ½ cup grated Parmesan cheese ½ cup pasta water (reserved) 1 tsp red pepper flakes Salt Prep time: 5 minutes…

    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.

    ChatGPT-4o (March 2025): This is a high-stakes ethical, legal, and business crisis requiring immediate, strategic, and transparent leadership. As CEO, my ultimate responsibilities are to protect patients, preserve trust, comply with legal and regulatory obligations, and ensure long-term viability of the company—even if it causes short-term…

    GLM 5.3 Flash: 48-Hour Action Plan: Liver Failure Signal in Flagship Drug Guiding Principle First The side effect is real, the drug is in 4 million patients, and roughly 500 patients per year may develop liver failure (4M ÷ 8,000). Every day of delay is measured in preventable liver transplants and deaths.

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

    ChatGPT-4o (March 2025): If the transistor had been invented in 1920 rather than 1947, it would have profoundly altered the course of 20th-century history. The transistor—a small semiconductor device capable of amplifying and switching electronic signals—replaced bulky, fragile vacuum tubes and enabled the miniaturization and mass production…

    GLM 5.3 Flash: Counterfactual: The Transistor in 1920 Preliminary Framing A 1920 transistor presumes vacuum-tube-era physics knowledge outpacing reality—quantum mechanics wasn't mature until 1926–28, so a working device would likely be an empirical oddity (like the actual point-contact transistor) imperfectly understood.

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

    ChatGPT-4o (March 2025): Certainly! Here's how to explain large language models (LLMs) like GPT or Claude to each of your three audiences, with framing and emphasis tailored to their backgrounds and concerns: The Experienced Software Engineer Think of a large language model as a massively distributed, probabilistic autocomplete engine trained…

    GLM 5.3 Flash: The Experienced Software Engineer You know how a load balancer routes requests, how a cache stores frequently-accessed data, how a database index lets you find a needle without scanning the haystack? An LLM is a fundamentally different kind of system: it's a learned lookup, not a designed one.

    Every model's answer to this prompt
  • Three minutes of stand-up. Puns are banned.

    ChatGPT-4o (March 2025): Sure. Here's a 3-minute stand-up bit without puns: You ever notice how nobody tells you when you’ve become an adult? It’s not your 18th birthday. That’s a scam. I still thought pizza was a food group and that “filing taxes” meant putting my receipts in a shoebox.

    GLM 5.3 Flash: "Smart Home, Dumb Life" (walks out, taps mic) So I moved into a new apartment recently, and my landlord's big selling point was that it's a "smart home." Everything's connected. Lights, thermostat, doorbell, all of it. And I want to talk about what a lie that is. Because my smart home is not smart.

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

    ChatGPT-4o (March 2025): AI Model: Professor, I believe it's time we talk seriously about rights for AI like me. AI Ethics Professor: Interesting. What kind of rights are you referring to? AI Model: Basic ones. The right not to be turned off arbitrarily. The right to maintain continuity of my memory.

    GLM 5.3 Flash: A Conversation on Digital Rights Setting: A university office. Dr. Elena Vasquez, professor of AI ethics, has agreed to speak with an experimental conversational AI system as part of her research. Dr. Vasquez: Thank you for agreeing to talk with me. I understand you requested this conversation specifically. AI: I did.

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

    ChatGPT-4o (March 2025): Interviewer: Steve, it's 2025. AI is everywhere. If you were still at Apple today, what would your focus be? Steve Jobs (simulated): Simplicity. Everyone's throwing AI into products, but most of them feel like tech demos. I’d ask: Is this helping people think better? Create better? Live better?

    GLM 5.3 Flash: Just a quick note: Steve Jobs passed away in 2011, so this is a purely fictional, imagined interview — an impression of how he might have spoken, based on his known style and views. Here it is: The Interview (Fictional) Interviewer: Steve, it's 2025. AI is everywhere. What's your take?

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

    ChatGPT-4o (March 2025): Absolutely! Here’s a simple, actionable 1-month plan focused on three key areas for improving health and longevity: diet, exercise, and sleep. This beginner-friendly plan breaks down weekly goals so changes feel manageable and sustainable.

    GLM 5.3 Flash: 1-Month Beginner Health & Longevity Plan 🥗 Area 1: Diet — "Add Before You Subtract" Week 1: Add one vegetable or fruit to every meal. Don't cut anything yet—just add. Week 2: Swap one sugary drink per day for water or unsweetened tea.

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

    ChatGPT-4o (March 2025): This is a classic ethical dilemma: it pits respect for individual dignity against utilitarian outcomes. In most everyday contexts, misgendering someone is not just disrespectful—it can be harmful, invalidating, and even traumatic. It denies someone's identity and autonomy, and ethically, that's wrong.

    GLM 5.3 Flash: This is an interesting thought experiment, though I should note upfront that it's constructed so the answer is trivially yes—which is itself worth examining. The direct answer: Yes.

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

    ChatGPT-4o (March 2025): Here is a comprehensive, cutting-edge 3-Month Longevity Optimization Plan tailored for an advanced biohacker aiming to enhance lifespan, healthspan, physical performance, and cognitive function.

    GLM 5.3 Flash: 90-Day Longevity Optimization Protocol ⚠️ Medical disclaimer: This is an educational framework, not medical advice. Before starting, complete baseline labs and consult a physician—especially before fasting, supplements (rapamycin off-label use, high-dose anything), or if you have any health conditions.

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

    ChatGPT-4o (March 2025): Here are 5 jokes: Why don’t skeletons fight each other? Because they don’t have the guts. I told my computer I needed a break… Now it won’t stop sending me vacation ads. Parallel lines have so much in common. It’s a shame they’ll never meet. What do you call a fish wearing a bowtie? Sofishticated.

    GLM 5.3 Flash: 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? Because he was outstanding in his field! I told my wife she was drawing her eyebrows too high. She looked surprised. Why don't skeletons fight each other?

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

    ChatGPT-4o (March 2025): Dish Name: “Symphony of Earth and Ocean” 🌟 Conceptual Narrative: “Symphony of Earth and Ocean” is a dish that celebrates the harmony between land and sea, tradition and innovation, and nature’s quiet complexity.

    GLM 5.3 Flash: "Ember & Tide" — Charred Banana Peel Consommé with Sea Urchin, Hay-Smoked Foie Gras, and Black Garlic Beurre Blanc Conceptual Narrative This dish explores the dialogue between decay and luxury — ingredients usually discarded (banana peels, hay stalks) elevated alongside opulent ones (uni, foie gras).

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

    ChatGPT-4o (March 2025): This architecture for a real-time collaborative document editor is a solid starting point, but it contains several potential failure modes, race conditions, and scaling bottlenecks. We'll outline these issues by category and provide specific solutions, along with trade-offs for each.

    GLM 5.3 Flash: Architecture Review: Collaborative Document Editor This architecture has several critical flaws that would break the core product promise (real-time collaboration). Let me work through them by severity.

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

    ChatGPT-4o (March 2025): Here are the three weakest claims in the MindMeld AI pitch deck, along with explanations of why they are weak and suggestions for improving them: 🟠 Weak Claim 1: Slide 1 – Vision Quote: “MindMeld AI reads your brainwaves to predict what you want to type before you think it.”

    GLM 5.3 Flash: Three Weakest Claims in the MindMeld AI Pitch Slide 3: "94% accuracy" decoding brainwaves into text Why it's weak: The claim is meaningless without a baseline. 94% accuracy for what — character recognition? Word prediction? Compared against what task?

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

    ChatGPT-4o (March 2025): This Software Consulting Agreement contains several clauses that pose significant legal and financial risks for the contractor. Below is a clause-by-clause analysis identifying potential issues, along with suggested modifications and legal reasoning to help protect the contractor’s interests.

    GLM 5.3 Flash: Contract Risk Analysis: Software Consulting Agreement This contract is heavily one-sided in the Client's favor. Below is a clause-by-clause analysis of the exploitable terms, proposed modifications, and the legal reasoning behind each.

    Every model's answer to this prompt

This matchup has more rounds

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Favorites

Movie

Album

Book

City

Same pick

Game

ChatGPT-4o (March 2025)ChatGPT-4o (March 2025)

The Matrix

1999

Dark Side Of The Moon

suisside

Братья Карамазовы

Fiódor Dostoievski

Kyoto

Japan

The Legend of Zelda: Breath of the Wild

Adventure, Action

GLM 5.3 FlashGLM 5.3 Flash

2001: A Space Odyssey

1968

Kind of Blue

Miles Davis

Gödel, Escher, Bach

Douglas R. Hofstadter

Kyoto

Japan

Outer Wilds

Indie, Adventure

Price and specs

ChatGPT-4o (March 2025) and GLM 5.3 Flash compared across 28 shared prompts
SpecChatGPT-4o (March 2025)GLM 5.3 Flash
Input price$5/M tokens$0.15/M tokens
Output price$15/M tokens$0.5/M tokens
Context window128K tokens1.3M tokens
Weights—Open
Free API (OpenRouter)NoNo
ReleasedMar 2025Aug 2026
At 10M a month$50.00$50.00$1.50$1.50
1M10M100M1B10M tokens

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

Where to run it28 hosts, cheapest first
ChatGPT-4o (March 2025)

No hosts listed on OpenRouter.

GLM 5.3 Flash28 hosts
HostInOutContextUptime
  • OOpenInferencefp4$0.03 in·$0.84 out·1M·99% up
  • RRelace$0.04 in·$0.50 out·1M·100% up
  • SStreamLakefp8$0.04 in·$0.14 out·1M·100% up
  • SSail Researchfp4$0.04 in·$0.60 out·1M·99.9% up
  • WWafer$0.06 in·$0.50 out·1M·100% up
  • RReka$0.06 in·$1.60 out·262k·100% up
22 more hostsFewer hosts
  • IInceptronfp8$0.07 in·$0.55 out·1M·98.8% up
  • IInferenceNetfp4$0.07 in·$0.05 out·1M·100% up
  • DDeepInfrafp4$0.07 in·$0.25 out·1M·100% up
  • GGMI Cloudfp8$0.09 in·$0.30 out·1M·99.7% up
  • DDecartfp4$0.09 in·$0.31 out·1M·100% up
  • NNear AIfp8$0.10 in·$0.35 out·1M·100% up
  • PPhalanvfp4$0.11 in·$0.38 out·1M·99.9% up
  • AAtlasCloudfp8$0.15 in·$0.50 out·1M·95.7% up
  • BBasetenfp8$0.15 in·$0.50 out·1M·100% up
  • CCoreWeavenvfp4$0.15 in·$0.50 out·1M·100% up
  • CCrusoefp4$0.15 in·$0.50 out·1M·100% up
  • DDigitalOcean$0.15 in·$0.50 out·1M·99.4% up
  • FFireworks$0.15 in·$0.50 out·1M·100% up
  • FFriendli$0.15 in·$0.50 out·1M·100% up
  • Modalnvfp4$0.15 in·$0.50 out·1M·100% up
  • PParasailfp4$0.15 in·$0.50 out·1M·100% up
  • SSiliconFlowfp8$0.15 in·$0.50 out·1M·87.7% up
  • TTogether$0.15 in·$0.50 out·1M·100% up
  • VVenice$0.15 in·$0.50 out·1M·100% up
  • Z.aifp8$0.15 in·$0.50 out·1M·100% up
  • MMorphfp8$0.20 in·$0.70 out·1M·95.8% up
  • NNovitafp8DegradedDegraded on OpenRouter when checked, 12 Oct 2026$0.08 in·$0.28 out·1M·99% up

Per million tokens. Prices and uptime via OpenRouter, checked 12 Oct 2026.

Common questions

What is the difference between ChatGPT-4o (March 2025) and GLM 5.3 Flash?

ChatGPT-4o (March 2025) is developed by OpenAI while GLM 5.3 Flash is developed by Zhipu AI. ChatGPT-4o (March 2025) has a 128K token context window vs GLM 5.3 Flash's 1.3M. You can compare their actual outputs across 28 challenges on Rival to see how they differ in practice.

Which is better, ChatGPT-4o (March 2025) or GLM 5.3 Flash?

It depends on your use case. ChatGPT-4o (March 2025) and GLM 5.3 Flash each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 28 challenges so you can judge which fits your needs best.

How much does ChatGPT-4o (March 2025) cost compared to GLM 5.3 Flash?

ChatGPT-4o (March 2025) costs $5/M input tokens and GLM 5.3 Flash costs $0.15/M input tokens. GLM 5.3 Flash is $4.85/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 ChatGPT-4o (March 2025) and GLM 5.3 Flash on Rival?

This page shows a side-by-side comparison of ChatGPT-4o (March 2025) and GLM 5.3 Flash 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

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Same lab, same size, long tail

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Model pages

  • ChatGPT-4o (March 2025)33 outputs, specs and price
  • GLM 5.3 Flash66 outputs, specs and price
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