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Claude Opus 4.6 vs Z.ai: GLM 5.1

Compare Claude Opus 4.6 by Anthropic against Z.ai: GLM 5.1 by Z-ai, context windows of 1.0M vs 203K, tested across 52 shared challenges. Updated April 2026.

Which is better, Claude Opus 4.6 or Z.ai: GLM 5.1?

Claude Opus 4.6 and Z.ai: GLM 5.1 are both competitive models. Claude Opus 4.6 costs $5/M input tokens vs $1.4/M for Z.ai: GLM 5.1. Context windows: 1000K vs 203K tokens. Compare their real outputs side by side below.

Key Differences Between Claude Opus 4.6 and Z.ai: GLM 5.1

Claude Opus 4.6 is made by anthropic while Z.ai: GLM 5.1 is from z-ai. Claude Opus 4.6 has a 1000K token context window compared to Z.ai: GLM 5.1's 203K. On pricing, Claude Opus 4.6 costs $5/M input tokens vs $1.4/M for Z.ai: GLM 5.1.

Our Verdict
Claude Opus 4.6
Claude Opus 4.6
Z.ai: GLM 5.1
Z.ai: GLM 5.1Runner-up

No community votes yet. On paper, Claude Opus 4.6 has the edge — bigger model tier, bigger context window, major provider backing.

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

Too close to call
Writing DNA

Style Comparison

Similarity
98%

Claude Opus 4.6 uses 20.7x more emoji

Claude Opus 4.6
Z.ai: GLM 5.1
53%Vocabulary54%
35wSentence Length18w
0.68Hedging0.31
5.2Bold3.6
2.9Lists2.6
0.21Emoji0.00
1.34Headings0.43
0.03Transitions0.11
Based on 23 + 27 text responses
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Claude Opus 4.6Z.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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