Z.ai: GLM 5.1 vs OpenAI o4 Mini High
Compare Z.ai: GLM 5.1 by Z-ai against OpenAI o4 Mini High by OpenAI, context windows of 203K vs 200K, tested across 52 shared challenges. Updated April 2026.
Which is better, Z.ai: GLM 5.1 or OpenAI o4 Mini High?
Z.ai: GLM 5.1 and OpenAI o4 Mini High are both competitive models. Z.ai: GLM 5.1 costs $1.4/M input tokens vs $1.1/M for OpenAI o4 Mini High. Context windows: 203K vs 200K tokens. Compare their real outputs side by side below.
Key Differences Between Z.ai: GLM 5.1 and OpenAI o4 Mini High
Z.ai: GLM 5.1 is made by z-ai while OpenAI o4 Mini High is from openai. Z.ai: GLM 5.1 has a 203K token context window compared to OpenAI o4 Mini High's 200K. On pricing, Z.ai: GLM 5.1 costs $1.4/M input tokens vs $1.1/M for OpenAI o4 Mini High.
No community votes yet. On paper, Z.ai: GLM 5.1 has the edge — bigger model tier, newer.
Style Comparison
Z.ai: GLM 5.1 uses 364.7x more bold
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.
