What is the difference between GLM 5.3 and Grok 4 Fast (free)?

GLM 5.3 is developed by Zhipu AI while Grok 4 Fast (free) is developed by xAI. GLM 5.3 has a 1.3M token context window vs Grok 4 Fast (free)'s 2.0M. You can compare their actual outputs across 2 challenges on Rival to see how they differ in practice.

Which is better, GLM 5.3 or Grok 4 Fast (free)?

It depends on your use case. GLM 5.3 and Grok 4 Fast (free) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 2 challenges so you can judge which fits your needs best.

How much does GLM 5.3 cost compared to Grok 4 Fast (free)?

GLM 5.3 costs $0.6538/M input tokens and Grok 4 Fast (free) costs $0/M input tokens. Grok 4 Fast (free) is $0.65/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 and Grok 4 Fast (free) on Rival?

This page shows a side-by-side comparison of GLM 5.3 and Grok 4 Fast (free) 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 5.3vsGrok 4 Fast (free)

Grok 4 Fast (free) is cheaper than GLM 5.3 at $0/M vs $0.6538/M input tokens.

GLM 5.3 and Grok 4 Fast (free) compared across 2 shared prompts
Spec	GLM 5.3	Grok 4 Fast (free)
Input price	$0.6538/M tokens	Free
Output price	$2.0548/M tokens	Free
Context window	1.3M tokens	2.0M tokens
Weights	Open	—
Free API (OpenRouter)	No	No
Released	Aug 2026	Sep 2025

Side by side

Same prompt, both answers

Opening lines from every prompt 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 5.3415 words

1-Month Beginner Health & Longevity Plan Week 1: Foundation & Awareness Goal: Establish baselines, not perfection 🥗 Diet Track what you currently eat for 3 days (no judging—just observe) Drink a glass of water upon waking each morning Add ONE vegetable to one meal daily 🏃 Exercise Walk 15 minutes daily (any pace, any…

Read the full answer

Grok 4 Fast (free)849 words

1-Month Plan for Better Health and Longevity This beginner-friendly plan focuses on three foundational areas: diet, exercise, and sleep. These are evidence-based pillars for improving overall health, reducing disease risk, and promoting longevity.

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 5.3210 words

Golden Pantry Fried Rice Total Time: 20 minutes (5 min prep, 15 min cook) Ingredients (7 pantry staples) Cooked white rice (day-old is best) Eggs Soy sauce Garlic (minced or garlic powder) Frozen peas and carrots Canned corn Vegetable oil Instructions Prep (5 min): Break up cold rice with a fork. Drain the corn.

Read the full answer

Grok 4 Fast (free)240 words

Pantry Hero Pasta Primavera This simple, savory one-pot pasta dish transforms basic staples into a flavorful, garlicky tomato sauce that's comforting and ready in under 30 minutes.

Read the full answer

Our Verdict

GLM 5.3

Grok 4 Fast (free)

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

Too close to call

API pricing

Cost per 1M tokens

GLM 5.3

Input

$0.65

Output

$2.05

Grok 4 Fast (free)

Input

$0.000

Output

$0.000

Where to run it

30 hosts, cheapest first

GLM 5.330 hosts

HostInOutContextUptime

Baidu Qianfanfp8$0.65 in$2.05 out1M99.8% up Morph$0.71 in$2.24 out1M99.8% up Rekafp8$0.76 in$2.57 out262k99.4% up Sail Researchfp8$0.77 in$4.00 out1M99.9% up Novitafp8$0.78 in$2.46 out1M99.9% up io.netfp8$0.82 in$2.77 out262k99.7% up

24 more hosts

Phala$0.84 in$2.64 out1M99.5% up DeepInfrafp4$0.90 in$3.00 out1M98% up InferenceNetfp4$0.90 in$3.00 out1M98% up DigitalOcean$0.91 in$2.86 out1M99.8% up Inceptronfp4$1.04 in$3.39 out1M99.4% up GMI Cloudfp8$1.05 in$3.30 out1M99.5% up Makorafp4$1.05 in$4.20 out980k97.3% up SiliconFlowfp8$1.12 in$3.52 out1M99.7% up Alibaba Cloud$1.19 in$3.74 out1M100% up Decartfp4$1.19 in$3.74 out1M99.1% up Friendli$1.26 in$3.96 out1M100% up AkashMLfp8$1.30 in$4.40 out1M100% up AtlasCloudfp8$1.40 in$4.40 out1M99.4% up Basetenfp4$1.40 in$4.40 out1M99.7% up Cloudflare Workers AI$1.40 in$4.40 out1.3M99.8% up Crusoefp4$1.40 in$4.40 out1M98.3% up Fireworks$1.40 in$4.40 out1M99.5% up Mistralnvfp4$1.40 in$4.40 out1M99.7% up Modal$1.40 in$4.40 out1M99% up Parasailfp8$1.40 in$4.40 out1M99.1% up Together$1.40 in$4.40 out1M98.1% up Venice$1.40 in$4.40 out1M98.8% up Wafer$1.40 in$4.40 out1M99.9% up Z.aifp8$1.40 in$4.40 out1M99.9% up

Grok 4 Fast (free)

No hosts listed on OpenRouter.

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

30 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between GLM 5.3 and Grok 4 Fast (free)?

Which is better, GLM 5.3 or Grok 4 Fast (free)?

How much does GLM 5.3 cost compared to Grok 4 Fast (free)?

How can I compare GLM 5.3 and Grok 4 Fast (free) 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

30 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between GLM 5.3 and Grok 4 Fast (free)?

Which is better, GLM 5.3 or Grok 4 Fast (free)?

How much does GLM 5.3 cost compared to Grok 4 Fast (free)?

How can I compare GLM 5.3 and Grok 4 Fast (free) on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages