GLM-5.2 vs GPT-5.5 Pro

Head-to-head technical comparison of intelligence, capabilities, and API pricing.

GLM-5.2

Z.ai

AI Mastery Index91.5

LMSYS Arena1465

Technical (MMLU-Pro)91.2%

Cost per 1M Tokens$1.4

GPT-5.5 Pro

OpenAI

AI Mastery Index94.2

LMSYS Arena1468

Technical (MMLU-Pro)94.2%

Cost per 1M Tokens$30

Architect's Verdict

When comparing GLM-5.2 and GPT-5.5 Pro, GPT-5.5 Pro edges out in overall capabilities according to the AI Mastery Index. However, for cost-sensitive workloads, GLM-5.2 offers a more economical API at $1.4 per 1M tokens. Your choice should depend heavily on whether you prioritize raw reasoning (MMLU) or scalable deployment economics.