Z.ai: GLM 5.1 vs Grok 4.20 Beta
Compare Z.ai: GLM 5.1 by Z-ai against Grok 4.20 Beta by xAI, context windows of 203K vs 2.0M, tested across 52 shared challenges. Updated April 2026.
Which is better, Z.ai: GLM 5.1 or Grok 4.20 Beta?
Z.ai: GLM 5.1 and Grok 4.20 Beta are both competitive models. Z.ai: GLM 5.1 costs $1.4/M input tokens vs $2/M for Grok 4.20 Beta. Context windows: 203K vs 2000K tokens. Compare their real outputs side by side below.
Key Differences Between Z.ai: GLM 5.1 and Grok 4.20 Beta
Z.ai: GLM 5.1 is made by z-ai while Grok 4.20 Beta is from xai. Z.ai: GLM 5.1 has a 203K token context window compared to Grok 4.20 Beta's 2000K. On pricing, Z.ai: GLM 5.1 costs $1.4/M input tokens vs $2/M for Grok 4.20 Beta.
No community votes yet. On paper, Grok 4.20 Beta has the edge — bigger model tier, bigger context window, major provider backing.
Style Comparison
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Ask them anything yourself
Some models write identically. You are paying for the brand.
178 models fingerprinted across 32 writing dimensions. Free research.
185x
price gap between models that write identically
178
models
12
clone pairs
32
dimensions
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
