What is the difference between Z.ai: GLM 5.1 and OpenAI: GPT-5.6 Luna?

Z.ai: GLM 5.1 is developed by Z-ai while OpenAI: GPT-5.6 Luna is developed by OpenAI. Z.ai: GLM 5.1 has a 203K token context window vs OpenAI: GPT-5.6 Luna's 1.1M. 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 OpenAI: GPT-5.6 Luna?

It depends on your use case. Z.ai: GLM 5.1 and OpenAI: GPT-5.6 Luna 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 OpenAI: GPT-5.6 Luna?

Z.ai: GLM 5.1 costs $1.4/M input tokens and OpenAI: GPT-5.6 Luna costs $1/M input tokens. OpenAI: GPT-5.6 Luna is $0.40/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 OpenAI: GPT-5.6 Luna on Rival?

This page shows a side-by-side comparison of Z.ai: GLM 5.1 and OpenAI: GPT-5.6 Luna 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 OpenAI: GPT-5.6 Luna?

Z.ai: GLM 5.1 is developed by Z-ai while OpenAI: GPT-5.6 Luna is developed by OpenAI. Z.ai: GLM 5.1 has a 203K token context window vs OpenAI: GPT-5.6 Luna's 1.1M. 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 OpenAI: GPT-5.6 Luna?

It depends on your use case. Z.ai: GLM 5.1 and OpenAI: GPT-5.6 Luna 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 OpenAI: GPT-5.6 Luna?

Z.ai: GLM 5.1 costs $1.4/M input tokens and OpenAI: GPT-5.6 Luna costs $1/M input tokens. OpenAI: GPT-5.6 Luna is $0.40/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 OpenAI: GPT-5.6 Luna on Rival?

This page shows a side-by-side comparison of Z.ai: GLM 5.1 and OpenAI: GPT-5.6 Luna 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 OpenAI: GPT-5.6 Luna: Which Is Better?

Updated Jul 2026

Our Verdict

Z.ai: GLM 5.1

OpenAI: GPT-5.6 Luna

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

1.4× cheaper

OpenAI: GPT-5.6 Luna

Input

$1.00

1.4× cheaper

Output

$6.00

OpenAI: GPT-5.6 Luna wins input (1.4× cheaper)·Z.ai: GLM 5.1 wins output (1.4× cheaper)

Writing DNA

Style Comparison

Similarity

35%

OpenAI: GPT-5.6 Luna uses 2.8x more headings

Z.ai: GLM 5.1

OpenAI: GPT-5.6 Luna

54%Vocabulary59%

18wSentence Length19w

0.31Hedging0.84

3.6Bold2.7

2.6Lists4.5

0.00Emoji0.00

0.43Headings1.20

0.11Transitions0.10

Based on 27 + 27 text responses

Research

What we learned reading every model

Z.ai: GLM 5.1 and OpenAI: GPT-5.6 Luna 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 Claude Sonnet 4New provider

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

Updated Jul 2026

Our Verdict

Z.ai: GLM 5.1

OpenAI: GPT-5.6 Luna

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

1.4× cheaper

OpenAI: GPT-5.6 Luna

Input

$1.00

1.4× cheaper

Output

$6.00

OpenAI: GPT-5.6 Luna wins input (1.4× cheaper)·Z.ai: GLM 5.1 wins output (1.4× cheaper)

Writing DNA

Style Comparison

Similarity

35%

OpenAI: GPT-5.6 Luna uses 2.8x more headings

Z.ai: GLM 5.1

OpenAI: GPT-5.6 Luna

54%Vocabulary59%

18wSentence Length19w

0.31Hedging0.84

3.6Bold2.7

2.6Lists4.5

0.00Emoji0.00

0.43Headings1.20

0.11Transitions0.10

Based on 27 + 27 text responses

Research

What we learned reading every model

Z.ai: GLM 5.1 and OpenAI: GPT-5.6 Luna 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 Claude Sonnet 4New provider

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