Z.ai: GLM 5.1 vs Qwen: Qwen3.5 Plus 2026-02-15
Compare Z.ai: GLM 5.1 by Z-ai against Qwen: Qwen3.5 Plus 2026-02-15 by Qwen, context windows of 203K vs 1.0M, tested across 52 shared challenges. Updated April 2026.
Which is better, Z.ai: GLM 5.1 or Qwen: Qwen3.5 Plus 2026-02-15?
Z.ai: GLM 5.1 and Qwen: Qwen3.5 Plus 2026-02-15 are both competitive models. Z.ai: GLM 5.1 costs $1.4/M input tokens vs $0.4/M for Qwen: Qwen3.5 Plus 2026-02-15. Context windows: 203K vs 1000K tokens. Compare their real outputs side by side below.
Key Differences Between Z.ai: GLM 5.1 and Qwen: Qwen3.5 Plus 2026-02-15
Z.ai: GLM 5.1 is made by z-ai while Qwen: Qwen3.5 Plus 2026-02-15 is from qwen. Z.ai: GLM 5.1 has a 203K token context window compared to Qwen: Qwen3.5 Plus 2026-02-15's 1000K. On pricing, Z.ai: GLM 5.1 costs $1.4/M input tokens vs $0.4/M for Qwen: Qwen3.5 Plus 2026-02-15.
No community votes yet. On paper, Qwen: Qwen3.5 Plus 2026-02-15 has the edge — bigger model tier, bigger context window.
Style Comparison
Qwen: Qwen3.5 Plus 2026-02-15 uses 10.0x more emoji
vsAsk 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.
