OpenAI Codex Mini vs Z.ai: GLM 5.1
Compare OpenAI Codex Mini by OpenAI against Z.ai: GLM 5.1 by Z-ai, context windows of 200K vs 203K, tested across 10 shared challenges. Updated April 2026.
Which is better, OpenAI Codex Mini or Z.ai: GLM 5.1?
OpenAI Codex Mini and Z.ai: GLM 5.1 are both competitive models. OpenAI Codex Mini costs $1.5/M input tokens vs $1.4/M for Z.ai: GLM 5.1. Context windows: 200K vs 203K tokens. Compare their real outputs side by side below.
Key Differences Between OpenAI Codex Mini and Z.ai: GLM 5.1
OpenAI Codex Mini is made by openai while Z.ai: GLM 5.1 is from z-ai. OpenAI Codex Mini has a 200K token context window compared to Z.ai: GLM 5.1's 203K. On pricing, OpenAI Codex Mini costs $1.5/M input tokens vs $1.4/M for Z.ai: GLM 5.1.
No community votes yet. On paper, Z.ai: GLM 5.1 has the edge — bigger model tier, newer.
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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.
