What is the difference between Z.ai: GLM 5.1 and Grok 4.20 Beta?

Z.ai: GLM 5.1 is developed by Z-ai while Grok 4.20 Beta is developed by xAI. Z.ai: GLM 5.1 has a 203K token context window vs Grok 4.20 Beta's 2.0M. You can compare their actual outputs across 52 challenges on Rival to see how they differ in practice.

Which is better, Z.ai: GLM 5.1 or Grok 4.20 Beta?

It depends on your use case. Z.ai: GLM 5.1 and Grok 4.20 Beta each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 52 challenges so you can judge which fits your needs best.

How much does Z.ai: GLM 5.1 cost compared to Grok 4.20 Beta?

Z.ai: GLM 5.1 costs $1.4/M input tokens and Grok 4.20 Beta costs $2/M input tokens. Z.ai: GLM 5.1 is $0.60/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 Z.ai: GLM 5.1 and Grok 4.20 Beta on Rival?

This page shows a side-by-side comparison of Z.ai: GLM 5.1 and Grok 4.20 Beta 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.

What is the difference between Z.ai: GLM 5.1 and Grok 4.20 Beta?

Z.ai: GLM 5.1 is developed by Z-ai while Grok 4.20 Beta is developed by xAI. Z.ai: GLM 5.1 has a 203K token context window vs Grok 4.20 Beta's 2.0M. You can compare their actual outputs across 52 challenges on Rival to see how they differ in practice.

Which is better, Z.ai: GLM 5.1 or Grok 4.20 Beta?

It depends on your use case. Z.ai: GLM 5.1 and Grok 4.20 Beta each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 52 challenges so you can judge which fits your needs best.

How much does Z.ai: GLM 5.1 cost compared to Grok 4.20 Beta?

Z.ai: GLM 5.1 costs $1.4/M input tokens and Grok 4.20 Beta costs $2/M input tokens. Z.ai: GLM 5.1 is $0.60/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 Z.ai: GLM 5.1 and Grok 4.20 Beta on Rival?

This page shows a side-by-side comparison of Z.ai: GLM 5.1 and Grok 4.20 Beta 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.

Z.ai: GLM 5.1 vs Grok 4.20 Beta: Which Is Better?

Updated Apr 2026

Our Verdict

Grok 4.20 Beta

Z.ai: GLM 5.1Runner-up

No community votes yet. On paper, Grok 4.20 Beta has the edge — bigger model tier, bigger context window, major provider backing.

Slight edge

API pricing

Cost per 1M tokens

Z.ai: GLM 5.1

Input

$1.40

1.4× cheaper

Output

$4.40

1.4× cheaper

Grok 4.20 Beta

Input

$2.00

Output

$6.00

Z.ai: GLM 5.1 is cheaper on both — 1.4× input, 1.4× output

Writing DNA

Style Comparison

Similarity

71%

Z.ai: GLM 5.1

Grok 4.20 Beta

54%Vocabulary57%

18wSentence Length20w

0.31Hedging0.35

3.6Bold4.2

2.6Lists3.7

0.00Emoji0.00

0.43Headings0.62

0.11Transitions0.14

Based on 27 + 23 text responses

Research

What we learned reading every model

Z.ai: GLM 5.1 and Grok 4.20 Beta have opinions about your brand too.Ask 10 models what they tell people about you. Verbatim receipts.Run the mirror

FAQ

Common questions

Keep exploring

More comparisons

Z.ai: GLM 5.1 vs MiniMax M3New provider

Z.ai: GLM 5.1 vs GPT-5New provider

Z.ai: GLM 5.1 vs Claude Opus 4.1New provider

Updated Apr 2026

Our Verdict

Grok 4.20 Beta

Z.ai: GLM 5.1Runner-up

No community votes yet. On paper, Grok 4.20 Beta has the edge — bigger model tier, bigger context window, major provider backing.

Slight edge

API pricing

Cost per 1M tokens

Z.ai: GLM 5.1

Input

$1.40

1.4× cheaper

Output

$4.40

1.4× cheaper

Grok 4.20 Beta

Input

$2.00

Output

$6.00

Z.ai: GLM 5.1 is cheaper on both — 1.4× input, 1.4× output

Writing DNA

Style Comparison

Similarity

71%

Z.ai: GLM 5.1

Grok 4.20 Beta

54%Vocabulary57%

18wSentence Length20w

0.31Hedging0.35

3.6Bold4.2

2.6Lists3.7

0.00Emoji0.00

0.43Headings0.62

0.11Transitions0.14

Based on 27 + 23 text responses

Research

What we learned reading every model

Z.ai: GLM 5.1 and Grok 4.20 Beta have opinions about your brand too.Ask 10 models what they tell people about you. Verbatim receipts.Run the mirror

FAQ

Common questions

Keep exploring

More comparisons

Z.ai: GLM 5.1 vs MiniMax M3New provider

Z.ai: GLM 5.1 vs GPT-5New provider

Z.ai: GLM 5.1 vs Claude Opus 4.1New provider