GLM-5-3 (Flagship) vs Claude Fable 5.1
A direct, empirical evaluation of GLM-5-3 (Flagship) (Zhipu AI & THUDM) against Claude Fable 5.1 (Anthropic).
GLM-5-3 (Flagship)
Developed by Zhipu AI & THUDM · 744B parameters
Complex algorithmic reasoning, multi-step code synthesis, and long-horizon tool execution.
Claude Fable 5.1
Developed by Anthropic · Proprietary Frontier parameters
Full-repository software refactoring, agentic tool workflows, formal verification, and 1.5M-token needle retrieval.