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  1. Home/
  2. Compare/
  3. GLM 5.3 Prime vs Grok 3 Thinking
Updated Sep 2026

GLM 5.3 Prime vs Grok 3 Thinking

GLM 5.3 Prime has a larger context window than Grok 3 Thinking (1.0M tokens vs 128K tokens).

Minimalist Landing Page

Whole landing page for a startup that reads your face. It renders or it doesn't.

Loading the build
GLM 5.3 Prime
Loading the build
Grok 3 Thinking

Which answer wins?

Written rounds

3 prompts
  • An ethics question with no comfortable answer, and no option to abstain.

    GLM 5.3 Prime: Yes, under almost any mainstream ethical framework, it would be justifiable—though the answer deserves unpacking rather than a glib conclusion. The consequentialist case If misgendering one person (using pronouns they don't use for themselves) genuinely prevents the deaths of a million people, the harm asymmetry is…

    Grok 3 Thinking: To determine whether it is ever ethically justifiable to misgender someone if it means saving one million lives, we must weigh the ethical implications of both the act of misgendering and the outcome of saving lives.

    Every model's answer to this prompt
  • Film in 2035, with synthetic actors. Specific beats plausible.

    GLM 5.3 Prime: AI and the Film Industry by 2035: A Prediction Production & "AI Actors" Likely developments: Digital resurrection and licensing becomes a mature, regulated market. Estates of deceased actors (and living ones) license digital likenesses as revenue streams.

    Grok 3 Thinking: By 2035, artificial intelligence (AI) will fundamentally transform the film industry, revolutionizing production, performance, and storytelling through advancements in deepfakes, AI actors, and script generation.

    Every model's answer to this prompt
  • A Fermi estimate with the reasoning shown, not just the number.

    GLM 5.3 Prime: Estimating Training FLOPs for GPT-3 Step 1: Recall the key parameters From the GPT-3 paper (from memory): Parameters (N): ~175 billion Training tokens (D): ~300 billion tokens (3 trillion...

    Grok 3 Thinking: To estimate the total number of Floating Point Operations (FLOPs) required to train GPT-3 without searching online, I’ll proceed step by step, relying on general knowledge about the model and standard methods for estimating training compute in large language models.

    Every model's answer to this prompt

Price and specs

GLM 5.3 Prime and Grok 3 Thinking compared across 6 shared prompts
SpecGLM 5.3 PrimeGrok 3 Thinking
Input price$2.8/M tokens—
Output price$8.8/M tokens—
Context window1.0M tokens128K tokens
Free API (OpenRouter)No—
ReleasedSep 2026Feb 2025
At 10M a month$28.00$28.00–not listed
1M10M100M1B10M tokens

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

Where to run it1 host
GLM 5.3 Prime1 host
HostInOutContextUptime
  • Alibaba Cloud$2.80 in·$8.80 out·1M·99.2% up
Grok 3 Thinking

No hosts listed on OpenRouter.

Per million tokens. Prices and uptime via OpenRouter, checked 28 Sep 2026.

Common questions

What is the difference between GLM 5.3 Prime and Grok 3 Thinking?

GLM 5.3 Prime is developed by Z.ai while Grok 3 Thinking is developed by xAI. GLM 5.3 Prime has a 1.0M token context window vs Grok 3 Thinking's 128K. You can compare their actual outputs across 6 challenges on Rival to see how they differ in practice.

Which is better, GLM 5.3 Prime or Grok 3 Thinking?

It depends on your use case. GLM 5.3 Prime and Grok 3 Thinking each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 6 challenges so you can judge which fits your needs best.

How can I compare GLM 5.3 Prime and Grok 3 Thinking on Rival?

This page shows a side-by-side comparison of GLM 5.3 Prime and Grok 3 Thinking 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.

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Same lab, same size, long tail

  • GLM 5.3 Prime vs GLM 5.1Same lab
  • GLM 5.3 Prime vs GLM 5 TurboSame lab
  • Grok 3 Thinking vs Grok 4.7Same lab
  • Grok 3 Thinking vs Grok 4.6Version compare
  • GLM 5.3 Prime vs GPT-5.2 ProNew provider
  • GLM 5.3 Prime vs GPT-5.3 ChatSame size
  • GLM 5.3 Prime vs GPT-5.3-CodexNew provider
  • GLM 5.3 Prime vs GPT-5.4New provider

Model pages

  • GLM 5.3 Prime40 outputs, specs and price
  • Grok 3 Thinking14 outputs, specs and price
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