What is the difference between Claude Opus 5 and Z.ai: GLM 5.1?

Claude Opus 5 is developed by Anthropic while Z.ai: GLM 5.1 is developed by Z-ai. Claude Opus 5 has a 1.0M token context window vs Z.ai: GLM 5.1's 203K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 5 or Z.ai: GLM 5.1?

It depends on your use case. Claude Opus 5 and Z.ai: GLM 5.1 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 Claude Opus 5 cost compared to Z.ai: GLM 5.1?

Claude Opus 5 costs $5/M input tokens and Z.ai: GLM 5.1 costs $1.4/M input tokens. Z.ai: GLM 5.1 is $3.60/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 Claude Opus 5 and Z.ai: GLM 5.1 on Rival?

This page shows a side-by-side comparison of Claude Opus 5 and Z.ai: GLM 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 Claude Opus 5 and Z.ai: GLM 5.1?

Claude Opus 5 is developed by Anthropic while Z.ai: GLM 5.1 is developed by Z-ai. Claude Opus 5 has a 1.0M token context window vs Z.ai: GLM 5.1's 203K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 5 or Z.ai: GLM 5.1?

It depends on your use case. Claude Opus 5 and Z.ai: GLM 5.1 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 Claude Opus 5 cost compared to Z.ai: GLM 5.1?

Claude Opus 5 costs $5/M input tokens and Z.ai: GLM 5.1 costs $1.4/M input tokens. Z.ai: GLM 5.1 is $3.60/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 Claude Opus 5 and Z.ai: GLM 5.1 on Rival?

This page shows a side-by-side comparison of Claude Opus 5 and Z.ai: GLM 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.

Claude Opus 5 vs Z.ai: GLM 5.1: Which Is Better?

Updated Jul 2026

Our Verdict

Claude Opus 5

Z.ai: GLM 5.1Runner-up

No community votes yet. On paper, Claude Opus 5 has the edge — bigger model tier, newer, bigger context window, major provider backing.

Z.ai: GLM 5.1 is 5.7x cheaper per token — worth considering if cost matters.

Slight edge

API pricing

Cost per 1M tokens

Claude Opus 5

Input

$5.00

Output

$25.00

Z.ai: GLM 5.1

Input

$1.40

3.6× cheaper

Output

$4.40

5.7× cheaper

Z.ai: GLM 5.1 is cheaper on both — 3.6× input, 5.7× output

Writing DNA

Style Comparison

Similarity

79%

Claude Opus 5 uses 1.7x more emoji

Claude Opus 5

Z.ai: GLM 5.1

54%Vocabulary54%

21wSentence Length18w

0.40Hedging0.31

3.9Bold3.6

1.9Lists2.6

0.02Emoji0.00

0.71Headings0.43

0.05Transitions0.11

Based on 27 + 27 text responses

Research

What we learned reading every model

Claude Opus 5 and Z.ai: GLM 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 5.1 vs MiniMax M3New provider

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

Z.ai: GLM 5.1 vs Claude Opus 4.1Cross-provider

Updated Jul 2026

Our Verdict

Claude Opus 5

Z.ai: GLM 5.1Runner-up

No community votes yet. On paper, Claude Opus 5 has the edge — bigger model tier, newer, bigger context window, major provider backing.

Z.ai: GLM 5.1 is 5.7x cheaper per token — worth considering if cost matters.

Slight edge

API pricing

Cost per 1M tokens

Claude Opus 5

Input

$5.00

Output

$25.00

Z.ai: GLM 5.1

Input

$1.40

3.6× cheaper

Output

$4.40

5.7× cheaper

Z.ai: GLM 5.1 is cheaper on both — 3.6× input, 5.7× output

Writing DNA

Style Comparison

Similarity

79%

Claude Opus 5 uses 1.7x more emoji

Claude Opus 5

Z.ai: GLM 5.1

54%Vocabulary54%

21wSentence Length18w

0.40Hedging0.31

3.9Bold3.6

1.9Lists2.6

0.02Emoji0.00

0.71Headings0.43

0.05Transitions0.11

Based on 27 + 27 text responses

Research

What we learned reading every model

Claude Opus 5 and Z.ai: GLM 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 5.1 vs MiniMax M3New provider

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

Z.ai: GLM 5.1 vs Claude Opus 4.1Cross-provider