What is the difference between GLM 5.3 Flash and GPT-5.2?

GLM 5.3 Flash is developed by Zhipu AI while GPT-5.2 is developed by OpenAI. GLM 5.3 Flash has a 1.3M token context window vs GPT-5.2's 400K. You can compare their actual outputs across 15 challenges on Rival to see how they differ in practice.

Which is better, GLM 5.3 Flash or GPT-5.2?

It depends on your use case. GLM 5.3 Flash and GPT-5.2 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.

How much does GLM 5.3 Flash cost compared to GPT-5.2?

GLM 5.3 Flash costs $0.15/M input tokens and GPT-5.2 costs $1.75/M input tokens. GLM 5.3 Flash is $1.60/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-5.2 on Rival?

This page shows a side-by-side comparison of GLM 5.3 Flash and GPT-5.2 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-5.2

GLM 5.3 Flash is cheaper than GPT-5.2 at $0.15/M vs $1.75/M input tokens.

GLM 5.3 Flash and GPT-5.2 compared across 15 shared prompts
Spec	GLM 5.3 Flash	GPT-5.2
Input price	$0.15/M tokens	$1.75/M tokens
Output price	$0.5/M tokens	$14/M tokens
Context window	1.3M tokens	400K tokens
Weights	Open	Closed
Free API (OpenRouter)	No	No
Released	Aug 2026	Dec 2025

Side by side

Same prompt, both answers

Opening lines from 2 of the 15 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…

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.

Read the full answer

GPT-5.2807 words

Below is a simple, beginner-friendly 1‑month plan built around 3 pillars: Nutrition, Movement, and Recovery (Sleep + Stress). It’s designed to be practical, low-friction, and sustainable.

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…

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…

Read the full answer

GPT-5.2211 words

Pantry “Golden Garlic Butter Pasta” (7-Ingredient Comfort Bowl) A rich, glossy pasta with garlicky butter and a pop of chili—made entirely from common pantry staples.

Read the full answer

Our Verdict

GLM 5.3 Flash

GPT-5.2

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

GLM 5.3 Flash costs 28x less per token.

Too close to call

API pricing

Cost per 1M tokens

GLM 5.3 Flash

Input

$0.15

12× cheaper

Output

$0.50

28× cheaper

GPT-5.2

Input

$1.75

Output

$14.00

GLM 5.3 Flash is cheaper on both: 12× input, 28× output.

Where to run it

32 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-5.22 hosts

HostInOutContextUptime

Azure AI Foundry$1.75 in$14.00 out400k100% up OpenAI$1.75 in$14.00 out400k99.6% up

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

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Same prompt, both answers

Beginner's Longevity Plan

Simple 7-Ingredient Recipe

Cost per 1M tokens

32 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between GLM 5.3 Flash and GPT-5.2?

Which is better, GLM 5.3 Flash or GPT-5.2?

How much does GLM 5.3 Flash cost compared to GPT-5.2?

How can I compare GLM 5.3 Flash and GPT-5.2 on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Same prompt, both answers

Beginner's Longevity Plan

Simple 7-Ingredient Recipe

Cost per 1M tokens

32 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between GLM 5.3 Flash and GPT-5.2?

Which is better, GLM 5.3 Flash or GPT-5.2?

How much does GLM 5.3 Flash cost compared to GPT-5.2?

How can I compare GLM 5.3 Flash and GPT-5.2 on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages