Claude 3 Opus vs Z.ai: GLM 5

Compare Claude 3 Opus by Anthropic against Z.ai: GLM 5 by Zhipu AI, context windows of 200K vs 203K, tested across 12 shared challenges. Updated April 2026.

Which is better, Claude 3 Opus or Z.ai: GLM 5?

Claude 3 Opus and Z.ai: GLM 5 are both competitive models. Claude 3 Opus costs $15/M input tokens vs $0.8/M for Z.ai: GLM 5. Context windows: 200K vs 203K tokens. Compare their real outputs side by side below.

Key Differences Between Claude 3 Opus and Z.ai: GLM 5

Claude 3 Opus is made by anthropic while Z.ai: GLM 5 is from zhipu. Claude 3 Opus has a 200K token context window compared to Z.ai: GLM 5's 203K. On pricing, Claude 3 Opus costs $15/M input tokens vs $0.8/M for Z.ai: GLM 5.

Our Verdict
Claude 3 Opus
Claude 3 Opus
Z.ai: GLM 5
Z.ai: GLM 5

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

Z.ai: GLM 5 is 29x cheaper per token — worth considering if cost matters.

Too close to call
Writing DNA

Style Comparison

Similarity
94%

Z.ai: GLM 5 uses 633.6x more bold

Claude 3 Opus
Z.ai: GLM 5
54%Vocabulary54%
14wSentence Length17w
0.48Hedging0.37
0.0Bold6.3
3.0Lists4.7
0.00Emoji0.00
0.00Headings0.60
0.06Transitions0.18
Based on 3 + 22 text responses
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Claude 3 OpusZ.ai: GLM 5

279 AI models invented the same fake scientist.

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AI Hallucination Index 2026
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