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Claude 3.7 Sonnet vs Z.ai: GLM 5.1

Compare Claude 3.7 Sonnet by Anthropic against Z.ai: GLM 5.1 by Z-ai, context windows of 200K vs 203K, tested across 52 shared challenges. Updated April 2026.

Which is better, Claude 3.7 Sonnet or Z.ai: GLM 5.1?

Claude 3.7 Sonnet and Z.ai: GLM 5.1 are both competitive models. Claude 3.7 Sonnet costs $3/M input tokens vs $1.4/M for Z.ai: GLM 5.1. Context windows: 200K vs 203K tokens. Compare their real outputs side by side below.

Key Differences Between Claude 3.7 Sonnet and Z.ai: GLM 5.1

Claude 3.7 Sonnet is made by anthropic while Z.ai: GLM 5.1 is from z-ai. Claude 3.7 Sonnet has a 200K token context window compared to Z.ai: GLM 5.1's 203K. On pricing, Claude 3.7 Sonnet costs $3/M input tokens vs $1.4/M for Z.ai: GLM 5.1.

Our Verdict
Claude 3.7 Sonnet
Claude 3.7 Sonnet
Z.ai: GLM 5.1
Z.ai: GLM 5.1

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 5.1 is 3.4x cheaper per token — worth considering if cost matters.

Too close to call
Writing DNA

Style Comparison

Similarity
98%

Claude 3.7 Sonnet uses 4.1x more headings

Claude 3.7 Sonnet
Z.ai: GLM 5.1
62%Vocabulary54%
35wSentence Length18w
0.99Hedging0.31
1.2Bold3.6
4.3Lists2.6
0.00Emoji0.00
1.78Headings0.43
0.23Transitions0.11
Based on 13 + 27 text responses
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Claude 3.7 SonnetZ.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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