Z.ai: GLM 5.1 vs Horizon Alpha
Compare Z.ai: GLM 5.1 by Z-ai against Horizon Alpha by OpenRouter, context windows of 203K vs 256K, tested across 33 shared challenges. Updated April 2026.
Which is better, Z.ai: GLM 5.1 or Horizon Alpha?
Z.ai: GLM 5.1 and Horizon Alpha are both competitive models. Z.ai: GLM 5.1 costs $1.4/M input tokens vs $0/M for Horizon Alpha. Context windows: 203K vs 256K tokens. Compare their real outputs side by side below.
Key Differences Between Z.ai: GLM 5.1 and Horizon Alpha
Z.ai: GLM 5.1 is made by z-ai while Horizon Alpha is from openrouter. Z.ai: GLM 5.1 has a 203K token context window compared to Horizon Alpha's 256K. On pricing, Z.ai: GLM 5.1 costs $1.4/M input tokens vs $0/M for Horizon Alpha.
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Style Comparison
Z.ai: GLM 5.1 uses 364.7x more bold
vs
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.
