Claude Opus 4.8 vs GLM-5.2

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

Claude Opus 4.8

Anthropic

AI Mastery Index94.6

LMSYS Arena1463

Technical (MMLU-Pro)94.5%

Cost per 1M Tokens$5

GLM-5.2

Z.ai

AI Mastery Index91.5

LMSYS Arena1465

Technical (MMLU-Pro)91.2%

Cost per 1M Tokens$1.4

Architect's Verdict

When comparing Claude Opus 4.8 and GLM-5.2, Claude Opus 4.8 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.