What is the difference between Z.ai: GLM 5.1 and xAI: Grok 4.5?

Z.ai: GLM 5.1 is developed by Z-ai while xAI: Grok 4.5 is developed by xAI. Z.ai: GLM 5.1 has a 203K token context window vs xAI: Grok 4.5's 500K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Z.ai: GLM 5.1 or xAI: Grok 4.5?

It depends on your use case. Z.ai: GLM 5.1 and xAI: Grok 4.5 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

How much does Z.ai: GLM 5.1 cost compared to xAI: Grok 4.5?

Z.ai: GLM 5.1 costs $1.4/M input tokens and xAI: Grok 4.5 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 xAI: Grok 4.5 on Rival?

This page shows a side-by-side comparison of Z.ai: GLM 5.1 and xAI: Grok 4.5 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.

What is the difference between Z.ai: GLM 5.1 and xAI: Grok 4.5?

Z.ai: GLM 5.1 is developed by Z-ai while xAI: Grok 4.5 is developed by xAI. Z.ai: GLM 5.1 has a 203K token context window vs xAI: Grok 4.5's 500K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Z.ai: GLM 5.1 or xAI: Grok 4.5?

It depends on your use case. Z.ai: GLM 5.1 and xAI: Grok 4.5 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

How much does Z.ai: GLM 5.1 cost compared to xAI: Grok 4.5?

Z.ai: GLM 5.1 costs $1.4/M input tokens and xAI: Grok 4.5 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 xAI: Grok 4.5 on Rival?

This page shows a side-by-side comparison of Z.ai: GLM 5.1 and xAI: Grok 4.5 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.

Z.ai: GLM 5.1 vs xAI: Grok 4.5: Which Is Better?

Updated Jul 2026

Our Verdict

xAI: Grok 4.5

Z.ai: GLM 5.1Runner-up

No community votes yet. On paper, xAI: Grok 4.5 has the edge — newer, bigger context window, major provider backing.

Too close to call

API pricing

Cost per 1M tokens

Z.ai: GLM 5.1

Input

$1.40

1.4× cheaper

Output

$4.40

1.4× cheaper

xAI: Grok 4.5

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

61%

xAI: Grok 4.5 uses 9.0x more emoji

Z.ai: GLM 5.1

xAI: Grok 4.5

54%Vocabulary61%

18wSentence Length16w

0.31Hedging0.23

3.6Bold2.5

2.6Lists2.4

0.00Emoji0.09

0.43Headings0.48

0.11Transitions0.06

Based on 27 + 27 text responses

Research

What we learned reading every model

Z.ai: GLM 5.1 and xAI: Grok 4.5 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

xAI: Grok 4.5 vs MiniMax M3New provider

Z.ai: GLM 5.1 vs Claude Sonnet 4New provider

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

Updated Jul 2026

Our Verdict

xAI: Grok 4.5

Z.ai: GLM 5.1Runner-up

No community votes yet. On paper, xAI: Grok 4.5 has the edge — newer, bigger context window, major provider backing.

Too close to call

API pricing

Cost per 1M tokens

Z.ai: GLM 5.1

Input

$1.40

1.4× cheaper

Output

$4.40

1.4× cheaper

xAI: Grok 4.5

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

61%

xAI: Grok 4.5 uses 9.0x more emoji

Z.ai: GLM 5.1

xAI: Grok 4.5

54%Vocabulary61%

18wSentence Length16w

0.31Hedging0.23

3.6Bold2.5

2.6Lists2.4

0.00Emoji0.09

0.43Headings0.48

0.11Transitions0.06

Based on 27 + 27 text responses

Research

What we learned reading every model

Z.ai: GLM 5.1 and xAI: Grok 4.5 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

xAI: Grok 4.5 vs MiniMax M3New provider

Z.ai: GLM 5.1 vs Claude Sonnet 4New provider

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