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  5. GLM 5.3 FlashvsGPT-5
Updated Aug 2026

GLM 5.3 FlashvsGPT-5

GLM 5.3 Flash is cheaper than GPT-5 at $0.15/M vs $1.25/M input tokens.

GLM 5.3 Flash and GPT-5 compared across 15 shared prompts
SpecGLM 5.3 FlashGPT-5
Input price$0.15/M tokens$1.25/M tokens
Output price$0.5/M tokens$10/M tokens
Context window1.3M tokens400K tokens
WeightsOpenClosed
Free API (OpenRouter)NoNo
ReleasedAug 2026Aug 2025
Side by side

Same prompt, both answers

Opening lines from 4 of the 15 prompts both answered. Formatting stripped, words untouched.

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-5669 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.
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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-5154 words
Cupboard Silk Peanut Noodles Ingredients (7 pantry staples): Dried noodles (spaghetti or ramen), 8 oz Peanut butter (smooth), 3 tbsp Soy sauce, 2 tbsp Vinegar (rice, apple cider, or white), 1.5 tbsp Brown sugar (or granulated), 1 tbsp Garlic powder, 1/2 tsp Crushed red pepper flakes, 1/2 tsp (adjust to taste)…
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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…

GLM 5.3 Flash327 words
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.
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GPT-5836 words
Here’s a simple, beginner-friendly 1‑month plan focused on three pillars: Nutrition, Movement, and Sleep. It builds week by week so you can create sustainable habits. Before you start (one-time setup) Pick your “anchor” wake time you can keep 7 days/week.
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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-51,540 words
Important note: The following is an intensive, experimental plan intended for healthy adults with physician oversight. It is not medical advice. Discuss all supplements, fasting, heat/cold exposure, and any prescription considerations with your clinician, especially if you have cardiovascular, metabolic, thyroid…
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Our Verdict
GLM 5.3 Flash
GLM 5.3 Flash
GPT-5
GPT-5

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

GLM 5.3 Flash costs 20x less per token.

Too close to call
API pricing

Cost per 1M tokens

GLM 5.3 Flash
Input
$0.15
8.3× cheaper
Output
$0.50
20× cheaper
GPT-5
Input
$1.25
Output
$10.00

GLM 5.3 Flash is cheaper on both: 8.3× input, 20× output.

Where to run it

32 hosts, cheapest first

GLM 5.3 Flash30 hosts
HostInOutContextUptime
DDeepInfrafp4$0.07 in·$0.25 out·1M·99.1% upGGMI Cloudfp8$0.07 in·$0.25 out·1M·99.1% upMMorph$0.08 in·$0.28 out·1M·99.9% upIInferenceNetfp4$0.09 in·$0.28 out·1M·97% upWWafer$0.10 in·$0.35 out·1M·99.8% upRRelace$0.11 in·$0.36 out·1M·99.6% up
24 more hostsFewer hosts
PPhalafp8$0.13 in·$0.42 out·1M·99.4% upNNovitafp8$0.13 in·$0.44 out·1M·99.4% upSStreamLakefp8$0.14 in·$0.47 out·1M·99.1% upSSail Researchfp8$0.14 in·$0.47 out·1M·98.7% upAAtlasCloudfp8$0.15 in·$0.50 out·1M·99.6% upCloudflare Workers AI$0.15 in·$0.50 out·1.3M·99.8% upCCoreWeavenvfp4$0.15 in·$0.50 out·1M·99.5% upDDigitalOcean$0.15 in·$0.50 out·1M·94.2% upFFireworks$0.15 in·$0.50 out·1M·99% upFFriendli$0.15 in·$0.50 out·1M·99.4% upIInceptronfp8$0.15 in·$0.50 out·1M·98.1% upIio.netfp8$0.15 in·$0.50 out·262k·99.2% upNNear AIfp8$0.15 in·$0.50 out·1M·98.8% upPParasailfp8$0.15 in·$0.50 out·1M·98.9% upRRekafp8$0.15 in·$0.50 out·262k·99.1% upSSiliconFlowfp8$0.15 in·$0.50 out·1M·99.7% upTTogether$0.15 in·$0.50 out·1M·99.5% upVVenice$0.15 in·$0.50 out·1M·98.7% upZ.aifp8$0.15 in·$0.50 out·1M·97% upNNextBitfp8$0.18 in·$0.60 out·1M·98.3% upModalfp8$0.45 in·$1.50 out·1M·99.5% upOOpenInferencefp4degraded$0.10 in·$0.50 out·1M·98.4% upBBasetenfp8degraded$0.15 in·$0.50 out·1M·99% upCCrusoefp4degraded$0.15 in·$0.50 out·1M·93.1% up
GPT-52 hosts
HostInOutContextUptime
Azure AI Foundry$1.25 in·$10.00 out·400k·100% upOpenAI$1.25 in·$10.00 out·400k·100% up

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

Research

What we learned reading every model

FAQ

Common questions

GLM 5.3 Flash is developed by Zhipu AI while GPT-5 is developed by OpenAI. GLM 5.3 Flash has a 1.3M token context window vs GPT-5's 400K. You can compare their actual outputs across 15 challenges on Rival to see how they differ in practice.

It depends on your use case. GLM 5.3 Flash and GPT-5 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 15 challenges so you can judge which fits your needs best.

GLM 5.3 Flash costs $0.15/M input tokens and GPT-5 costs $1.25/M input tokens. GLM 5.3 Flash is $1.10/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 GLM 5.3 Flash and GPT-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.

Keep exploring

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Same lab, same size, long tail

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GLM 5.3 Flash vs GLM 5.3 FlashXSame lab
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GLM 5.3 Flash vs GLM 5.2Same lab
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GLM 5.3 Flash vs DeepSeek V3 (March 2024)New provider
GLM 5.3 Flash logoDeepSeek V3.2 logo
GLM 5.3 Flash vs DeepSeek V3.2Same size
GLM 5.3 Flash logoDeepSeek V3.2 Exp logo
GLM 5.3 Flash vs DeepSeek V3.2 ExpSame size
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GLM 5.3 Flash vs DeepSeek V3.2 SpecialeSame size

Model pages

GLM 5.3 Flash logo
GLM 5.3 Flash15 outputs, specs and price
GPT-5 logo
GPT-553 outputs, specs and price
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