Z.ai: GLM 5.1
Nothing here. The model returned empty. We stared at it for a while.
Z.ai: GLM 5.1 vs OpenAI o3
Compare Z.ai: GLM 5.1 by Z-ai against OpenAI o3 by OpenAI, tested across 52 shared challenges. Updated April 2026.
Which is better, Z.ai: GLM 5.1 or OpenAI o3?
Z.ai: GLM 5.1 and OpenAI o3 are both competitive models. Z.ai: GLM 5.1 costs $1.4/M input tokens vs $10/M for OpenAI o3. Compare their real outputs side by side below.
Key Differences Between Z.ai: GLM 5.1 and OpenAI o3
Z.ai: GLM 5.1 is made by z-ai while OpenAI o3 is from openai. On pricing, Z.ai: GLM 5.1 costs $1.4/M input tokens vs $10/M for OpenAI o3.
Our Verdict
OpenAI o3
Z.ai: GLM 5.1Runner-up
No community votes yet. On paper, OpenAI o3 has the edge — bigger model tier, major provider backing.
Z.ai: GLM 5.1 is 9.1x cheaper per token — worth considering if cost matters.
Too close to call
Writing DNA
Style Comparison
Similarity
98%
Z.ai: GLM 5.1 uses 5.2x more bold
Z.ai: GLM 5.1
OpenAI o3
54%Vocabulary68%
18wSentence Length14w
0.31Hedging0.26
3.6Bold0.7
2.6Lists3.0
0.00Emoji0.00
0.43Headings0.38
0.11Transitions0.12
Based on 27 + 16 text responses
vsAsk them anything yourself
Some models write identically. You are paying for the brand.
178 models fingerprinted across 32 writing dimensions. Free research.
Model Similarity Index
185x
price gap between models that write identically
178
models
12
clone pairs
32
dimensions
Devstral M / S
95.7%
Qwen3 Coder / Flash
95.6%
GPT-5.4 / Mini
93.3%
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
Free preview13 of 58 slides
FAQ