What is the difference between Claude Opus 4.5 and Z.ai: GLM 5.1?

Claude Opus 4.5 is developed by Anthropic while Z.ai: GLM 5.1 is developed by Z-ai. in 2 community votes on Rival, Z.ai: GLM 5.1 wins 100% of head-to-head matchups. These results are based on blind head-to-head voting across 52 challenges.

Which is better, Claude Opus 4.5 or Z.ai: GLM 5.1?

Based on 2 community votes on Rival, Z.ai: GLM 5.1 wins 100% of head-to-head matchups against Claude Opus 4.5.

How are Claude Opus 4.5 vs Z.ai: GLM 5.1 votes collected on Rival?

Rival presents both models' outputs side-by-side in blind duels. Voters see the responses but don't know which model produced each one, eliminating brand bias. 2 votes have been collected for this pair across 52 challenges. All vote data is part of Rival's open dataset.

What is the difference between Claude Opus 4.5 and Z.ai: GLM 5.1?

Claude Opus 4.5 is developed by Anthropic while Z.ai: GLM 5.1 is developed by Z-ai. in 2 community votes on Rival, Z.ai: GLM 5.1 wins 100% of head-to-head matchups. These results are based on blind head-to-head voting across 52 challenges.

Which is better, Claude Opus 4.5 or Z.ai: GLM 5.1?

Based on 2 community votes on Rival, Z.ai: GLM 5.1 wins 100% of head-to-head matchups against Claude Opus 4.5.

How are Claude Opus 4.5 vs Z.ai: GLM 5.1 votes collected on Rival?

Rival presents both models' outputs side-by-side in blind duels. Voters see the responses but don't know which model produced each one, eliminating brand bias. 2 votes have been collected for this pair across 52 challenges. All vote data is part of Rival's open dataset.

Claude Opus 4.5 vs Z.ai: GLM 5.1: Which Is Better?

Updated Apr 2026

Our Verdict

Z.ai: GLM 5.1Winner

Claude Opus 4.5Runner-up

Pick Z.ai: GLM 5.1. In 2 blind votes, Z.ai: GLM 5.1 wins 100% of the time. That's not luck.

Clear winner

API pricing

Cost per 1M tokens

Claude Opus 4.5

Input

—

Output

—

Z.ai: GLM 5.1

Input

$1.40

Output

$4.40

Writing DNA

Style Comparison

Similarity

24%

Claude Opus 4.5 uses 15.2x more emoji

Claude Opus 4.5

Z.ai: GLM 5.1

64%Vocabulary54%

55wSentence Length18w

0.86Hedging0.31

5.8Bold3.6

4.5Lists2.6

0.15Emoji0.00

1.59Headings0.43

0.05Transitions0.11

Based on 24 + 27 text responses

Research

What we learned reading every model

Claude Opus 4.5 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

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Claude Opus 4.5 vs MiniMax M3New provider

Claude Opus 4.5 vs GPT-5New provider

Z.ai: GLM 5.1 vs Llama 4 MaverickNew provider

Updated Apr 2026

Our Verdict

Z.ai: GLM 5.1Winner

Claude Opus 4.5Runner-up

Pick Z.ai: GLM 5.1. In 2 blind votes, Z.ai: GLM 5.1 wins 100% of the time. That's not luck.

Clear winner

API pricing

Cost per 1M tokens

Claude Opus 4.5

Input

—

Output

—

Z.ai: GLM 5.1

Input

$1.40

Output

$4.40

Writing DNA

Style Comparison

Similarity

24%

Claude Opus 4.5 uses 15.2x more emoji

Claude Opus 4.5

Z.ai: GLM 5.1

64%Vocabulary54%

55wSentence Length18w

0.86Hedging0.31

5.8Bold3.6

4.5Lists2.6

0.15Emoji0.00

1.59Headings0.43

0.05Transitions0.11

Based on 24 + 27 text responses

Research

What we learned reading every model

Claude Opus 4.5 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

Claude Opus 4.5 vs MiniMax M3New provider

Claude Opus 4.5 vs GPT-5New provider

Z.ai: GLM 5.1 vs Llama 4 MaverickNew provider