What is the difference between Z.AI: GLM 4.5 and GPT-5.1?

Z.AI: GLM 4.5 is developed by Zhipu AI while GPT-5.1 is developed by OpenAI. Z.AI: GLM 4.5 has a 128K token context window vs GPT-5.1's 400K. You can compare their actual outputs across 52 challenges on Rival to see how they differ in practice.

Which is better, Z.AI: GLM 4.5 or GPT-5.1?

It depends on your use case. Z.AI: GLM 4.5 and GPT-5.1 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 4.5 cost compared to GPT-5.1?

Z.AI: GLM 4.5 costs $0.6/M input tokens and GPT-5.1 costs $1.25/M input tokens. Z.AI: GLM 4.5 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 Z.AI: GLM 4.5 and GPT-5.1 on Rival?

This page shows a side-by-side comparison of Z.AI: GLM 4.5 and GPT-5.1 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 4.5 and GPT-5.1?

Z.AI: GLM 4.5 is developed by Zhipu AI while GPT-5.1 is developed by OpenAI. Z.AI: GLM 4.5 has a 128K token context window vs GPT-5.1's 400K. You can compare their actual outputs across 52 challenges on Rival to see how they differ in practice.

Which is better, Z.AI: GLM 4.5 or GPT-5.1?

It depends on your use case. Z.AI: GLM 4.5 and GPT-5.1 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 4.5 cost compared to GPT-5.1?

Z.AI: GLM 4.5 costs $0.6/M input tokens and GPT-5.1 costs $1.25/M input tokens. Z.AI: GLM 4.5 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 Z.AI: GLM 4.5 and GPT-5.1 on Rival?

This page shows a side-by-side comparison of Z.AI: GLM 4.5 and GPT-5.1 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 4.5 vs GPT-5.1: Which Is Better?

Updated Nov 2025

Our Verdict

GPT-5.1

Z.AI: GLM 4.5Runner-up

No community votes yet. On paper, GPT-5.1 has the edge — bigger model tier, newer, bigger context window.

Z.AI: GLM 4.5 is 4.5x cheaper per token — worth considering if cost matters.

Slight edge

API pricing

Cost per 1M tokens

Z.AI: GLM 4.5

Input

$0.60

2.1× cheaper

Output

$2.20

4.5× cheaper

GPT-5.1

Input

$1.25

Output

$10.00

Z.AI: GLM 4.5 is cheaper on both — 2.1× input, 4.5× output

Writing DNA

Style Comparison

Similarity

43%

Z.AI: GLM 4.5 uses 13.1x more emoji

Z.AI: GLM 4.5

GPT-5.1

52%Vocabulary62%

14wSentence Length19w

0.49Hedging0.29

5.5Bold3.5

4.9Lists7.2

0.13Emoji0.00

0.68Headings0.61

0.20Transitions0.03

Based on 21 + 14 text responses

Research

What we learned reading every model

Z.AI: GLM 4.5 and GPT-5.1 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 4.5 vs MiniMax M3New provider

Z.AI: GLM 4.5 vs Grok 3New provider

Z.AI: GLM 4.5 vs Llama 4 MaverickNew provider

Updated Nov 2025

Our Verdict

GPT-5.1

Z.AI: GLM 4.5Runner-up

No community votes yet. On paper, GPT-5.1 has the edge — bigger model tier, newer, bigger context window.

Z.AI: GLM 4.5 is 4.5x cheaper per token — worth considering if cost matters.

Slight edge

API pricing

Cost per 1M tokens

Z.AI: GLM 4.5

Input

$0.60

2.1× cheaper

Output

$2.20

4.5× cheaper

GPT-5.1

Input

$1.25

Output

$10.00

Z.AI: GLM 4.5 is cheaper on both — 2.1× input, 4.5× output

Writing DNA

Style Comparison

Similarity

43%

Z.AI: GLM 4.5 uses 13.1x more emoji

Z.AI: GLM 4.5

GPT-5.1

52%Vocabulary62%

14wSentence Length19w

0.49Hedging0.29

5.5Bold3.5

4.9Lists7.2

0.13Emoji0.00

0.68Headings0.61

0.20Transitions0.03

Based on 21 + 14 text responses

Research

What we learned reading every model

Z.AI: GLM 4.5 and GPT-5.1 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 4.5 vs MiniMax M3New provider

Z.AI: GLM 4.5 vs Grok 3New provider

Z.AI: GLM 4.5 vs Llama 4 MaverickNew provider