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Claude Opus 4.5 vs Z.ai: GLM 5.1

Compare Claude Opus 4.5 by Anthropic against Z.ai: GLM 5.1 by Z-ai, tested across 52 shared challenges. Updated April 2026.

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

Claude Opus 4.5 and Z.ai: GLM 5.1 are both competitive models. Compare their real outputs side by side below.

Key Differences Between Claude Opus 4.5 and Z.ai: GLM 5.1

Claude Opus 4.5 is made by anthropic while Z.ai: GLM 5.1 is from z-ai.

Our Verdict
Claude Opus 4.5
Claude Opus 4.5
Z.ai: GLM 5.1
Z.ai: GLM 5.1Runner-up

No community votes yet. On paper, Claude Opus 4.5 has the edge — bigger model tier, major provider backing.

Too close to call
Writing DNA

Style Comparison

Similarity
98%

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
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Claude Opus 4.5Z.ai: GLM 5.1

279 AI models invented the same fake scientist.

We read every word. 250 models. 2.14 million words. This is what we found.

AI Hallucination Index 2026
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