What is the difference between GLM 5.3 Flash and GPT-4.5?

GLM 5.3 Flash is developed by Zhipu AI while GPT-4.5 is developed by OpenAI. GLM 5.3 Flash has a 1.3M token context window vs GPT-4.5's 128K. You can compare their actual outputs across 3 challenges on Rival to see how they differ in practice.

Which is better, GLM 5.3 Flash or GPT-4.5?

It depends on your use case. GLM 5.3 Flash and GPT-4.5 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 3 challenges so you can judge which fits your needs best.

How much does GLM 5.3 Flash cost compared to GPT-4.5?

GLM 5.3 Flash costs $0.15/M input tokens and GPT-4.5 costs $75/M input tokens. GLM 5.3 Flash is $74.85/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 GLM 5.3 Flash and GPT-4.5 on Rival?

This page shows a side-by-side comparison of GLM 5.3 Flash and GPT-4.5 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.

Updated Aug 2026

GLM 5.3 FlashvsGPT-4.5

GLM 5.3 Flash is cheaper than GPT-4.5 at $0.15/M vs $75/M input tokens.

GLM 5.3 Flash and GPT-4.5 compared across 3 shared prompts
Spec	GLM 5.3 Flash	GPT-4.5
Input price	$0.15/M tokens	$75/M tokens
Output price	$0.5/M tokens	$150/M tokens
Context window	1.3M tokens	128K tokens
Weights	Open	—
Free API (OpenRouter)	No	No
Released	Aug 2026	Feb 2025

Side by side

Same prompt, both answers

Opening lines from every prompt both answered. Formatting stripped, words untouched.

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…

GLM 5.3 Flash205 words

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…

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GPT-4.5153 words

Sweet Cinnamon Sugar Swirls Ingredients: 1 sheet puff pastry, thawed 1/4 cup granulated sugar 1 tablespoon cinnamon 2 tablespoons melted butter Pinch of salt 1 teaspoon vanilla extract Powdered sugar (optional for dusting) Prep Time: 10 minutes Cook Time: 15 minutes Total Time: 25 minutes Instructions: Preheat your…

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Advanced Longevity Plan (Biohacker)

Develop a comprehensive, cutting-edge 3-month longevity plan for a biohacker aiming to optimize longevity, physical and cognitive…

GLM 5.3 Flash1,294 words

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.

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GPT-4.5202 words

Longevity Optimization Protocol (3-Month Timeline) Month 1: Establish Foundational Habits & Baseline Metrics Full biomarker panel & epigenetic age test. Wearable setup: Oura/WHOOP, CGM, HR chest strap. Diet: 5-day keto (70/25/5) + 2 carb-refeed days; 16:8 IF + weekly 24-h fast.

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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…

GLM 5.3 Flash720 words

"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).

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GPT-4.5322 words

Dish Title: "Ocean & Earth Symphony: Kombu-Cured Venison, Sea Urchin Custard, Black Garlic Soil, and Smoked Cherry Blossom Emulsion" Conceptual Narrative: This composition embodies the delicate interplay between land and sea, exploring the subtle yet profound connection between umami-rich sea elements and earthy forest…

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Our Verdict

GLM 5.3 Flash

GPT-4.5

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

GLM 5.3 Flash costs 300x less per token.

Too close to call

API pricing

Cost per 1M tokens

GLM 5.3 Flash

Input

$0.15

500× cheaper

Output

$0.50

300× cheaper

GPT-4.5

Input

$75.00

Output

$150.00

GLM 5.3 Flash is cheaper on both: 500× input, 300× output.

Where to run it

30 hosts, cheapest first

GLM 5.3 Flash30 hosts

HostInOutContextUptime

DeepInfrafp4$0.07 in$0.25 out1M99.1% up GMI Cloudfp8$0.07 in$0.25 out1M99.2% up Morph$0.08 in$0.28 out1M100% up InferenceNetfp4$0.09 in$0.28 out1M97.5% up Wafer$0.10 in$0.35 out1M99.7% up OpenInferencefp4$0.10 in$0.50 out1M98.6% up

24 more hosts

Relace$0.11 in$0.36 out1M99.7% up Phalafp8$0.13 in$0.42 out1M99.5% up Novitafp8$0.13 in$0.44 out1M99.4% up StreamLakefp8$0.14 in$0.47 out1M99% up Sail Researchfp8$0.14 in$0.47 out1M99% up AtlasCloudfp8$0.15 in$0.50 out1M99.6% up Basetenfp8$0.15 in$0.50 out1M98.7% up CoreWeavenvfp4$0.15 in$0.50 out1M99.5% up DigitalOcean$0.15 in$0.50 out1M93.7% up Fireworks$0.15 in$0.50 out1M99% up Friendli$0.15 in$0.50 out1M98.7% up Inceptronfp8$0.15 in$0.50 out1M98.2% up io.netfp8$0.15 in$0.50 out262k99.2% up Near AIfp8$0.15 in$0.50 out1M98.9% up Parasailfp8$0.15 in$0.50 out1M98.7% up Rekafp8$0.15 in$0.50 out262k98.9% up SiliconFlowfp8$0.15 in$0.50 out1M99.7% up Together$0.15 in$0.50 out1M99.5% up Venice$0.15 in$0.50 out1M98.8% up Z.aifp8$0.15 in$0.50 out1M96.5% up NextBitfp8$0.18 in$0.60 out1M97.9% up Cloudflare Workers AI$0.30 in$1.00 out1.3M99.8% up Modalfp8$0.45 in$1.50 out1M99.6% up Crusoefp4degraded$0.15 in$0.50 out1M93% up

GPT-4.5

No hosts listed on OpenRouter.

Per million tokens. Prices and uptime via OpenRouter, checked 22 Sep 2026.

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