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Z.AI: GLM 4.5 vs Claude Opus 4

Compare Z.AI: GLM 4.5 by Zhipu AI against Claude Opus 4 by Anthropic, in 16 community votes, z.ai: glm 4.5 and claude opus 4 are closely matched, context windows of 128K vs 200K, tested across 30 shared challenges. Updated April 2026.

Which is better, Z.AI: GLM 4.5 or Claude Opus 4?

Z.AI: GLM 4.5 and Claude Opus 4 are closely matched based on 16 community votes. Z.AI: GLM 4.5 costs $0.6/M input tokens vs $15/M for Claude Opus 4. Context windows: 128K vs 200K tokens. Compare their real outputs side by side below.

Key Differences Between Z.AI: GLM 4.5 and Claude Opus 4

Z.AI: GLM 4.5 is made by zhipu while Claude Opus 4 is from anthropic. Z.AI: GLM 4.5 has a 128K token context window compared to Claude Opus 4's 200K. On pricing, Z.AI: GLM 4.5 costs $0.6/M input tokens vs $15/M for Claude Opus 4. In community voting, In 16 community votes, Z.AI: GLM 4.5 and Claude Opus 4 are closely matched.

In 16 community votes, Z.AI: GLM 4.5 and Claude Opus 4 are closely matched. Z.AI: GLM 4.5 leads in Web Design, while Claude Opus 4 leads in Image Generation. Based on blind community voting from the Rival open dataset of 16+ human preference judgments for this pair.

Web Design: Z.AI: GLM 4.5 wins 80% of votes
Image Generation: Claude Opus 4 wins 100% of votes
Our Verdict
Z.AI: GLM 4.5
Z.AI: GLM 4.5
Claude Opus 4
Claude Opus 4

Too close to call. Pick based on your use case.

Pick Z.AI: GLM 4.5 for Web Design. Pick Claude Opus 4 for Image Generation. Z.AI: GLM 4.5 is 34x cheaper per token — worth considering if cost matters.

Too close to call
Writing DNA

Style Comparison

Similarity
79%

Claude Opus 4 uses 4.3x more sentence length

Z.AI: GLM 4.5
Claude Opus 4
52%Vocabulary64%
14wSentence Length62w
0.49Hedging0.52
5.5Bold4.4
4.9Lists9.1
0.13Emoji0.11
0.68Headings1.87
0.20Transitions0.27
Based on 21 + 16 text responses
vs

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Z.AI: GLM 4.5Claude Opus 4

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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