What is the difference between Z.ai: GLM 5.1 and GPT-5.1 Chat?

Z.ai: GLM 5.1 is developed by Z-ai while GPT-5.1 Chat is developed by OpenAI. Z.ai: GLM 5.1 has a 203K token context window vs GPT-5.1 Chat's 128K. You can compare their actual outputs across 51 challenges on Rival to see how they differ in practice.

Which is better, Z.ai: GLM 5.1 or GPT-5.1 Chat?

It depends on your use case. Z.ai: GLM 5.1 and GPT-5.1 Chat each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 51 challenges so you can judge which fits your needs best.

How much does Z.ai: GLM 5.1 cost compared to GPT-5.1 Chat?

Z.ai: GLM 5.1 costs $1.4/M input tokens and GPT-5.1 Chat costs $1.25/M input tokens. GPT-5.1 Chat is $0.15/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 GPT-5.1 Chat on Rival?

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

Z.ai: GLM 5.1 is developed by Z-ai while GPT-5.1 Chat is developed by OpenAI. Z.ai: GLM 5.1 has a 203K token context window vs GPT-5.1 Chat's 128K. You can compare their actual outputs across 51 challenges on Rival to see how they differ in practice.

Which is better, Z.ai: GLM 5.1 or GPT-5.1 Chat?

It depends on your use case. Z.ai: GLM 5.1 and GPT-5.1 Chat each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 51 challenges so you can judge which fits your needs best.

How much does Z.ai: GLM 5.1 cost compared to GPT-5.1 Chat?

Z.ai: GLM 5.1 costs $1.4/M input tokens and GPT-5.1 Chat costs $1.25/M input tokens. GPT-5.1 Chat is $0.15/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 GPT-5.1 Chat on Rival?

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

Updated Apr 2026

Our Verdict

Z.ai: GLM 5.1

GPT-5.1 Chat

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

Too close to call

API pricing

Cost per 1M tokens

Z.ai: GLM 5.1

Input

$1.40

Output

$4.40

2.3× cheaper

GPT-5.1 Chat

Input

$1.25

1.1× cheaper

Output

$10.00

GPT-5.1 Chat wins input (1.1× cheaper)·Z.ai: GLM 5.1 wins output (2.3× cheaper)

Writing DNA

Style Comparison

Similarity

54%

Z.ai: GLM 5.1 uses 43.5x more headings

Z.ai: GLM 5.1

GPT-5.1 Chat

54%Vocabulary73%

18wSentence Length18w

0.31Hedging0.45

3.6Bold1.1

2.6Lists2.4

0.00Emoji0.00

0.43Headings0.00

0.11Transitions0.06

Based on 27 + 15 text responses

Research

What we learned reading every model

Z.ai: GLM 5.1 and GPT-5.1 Chat 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

GPT-5.1 Chat vs MiniMax M3New provider

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

GPT-5.1 Chat vs Pony AlphaNew provider

Updated Apr 2026

Our Verdict

Z.ai: GLM 5.1

GPT-5.1 Chat

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

Too close to call

API pricing

Cost per 1M tokens

Z.ai: GLM 5.1

Input

$1.40

Output

$4.40

2.3× cheaper

GPT-5.1 Chat

Input

$1.25

1.1× cheaper

Output

$10.00

GPT-5.1 Chat wins input (1.1× cheaper)·Z.ai: GLM 5.1 wins output (2.3× cheaper)

Writing DNA

Style Comparison

Similarity

54%

Z.ai: GLM 5.1 uses 43.5x more headings

Z.ai: GLM 5.1

GPT-5.1 Chat

54%Vocabulary73%

18wSentence Length18w

0.31Hedging0.45

3.6Bold1.1

2.6Lists2.4

0.00Emoji0.00

0.43Headings0.00

0.11Transitions0.06

Based on 27 + 15 text responses

Research

What we learned reading every model

Z.ai: GLM 5.1 and GPT-5.1 Chat 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

GPT-5.1 Chat vs MiniMax M3New provider

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

GPT-5.1 Chat vs Pony AlphaNew provider