#llmbenchmark

Zhipu AI's 753B open-weight GLM-5.2 is the highest-ranking open-source model on lmarena.ai, challenging Claude Fable 5 across WebDev and Agent benchmarks — and it's already runnable locally via Ollama.

Anthropic's Claude Fable 5 tops nearly every benchmark at half the price of Mythos Preview — but the silent nerf clause changes the trust equation for every developer.