GLM-5.2

Zhipu's GLM-5.2 is a ~753B-parameter open-weight MoE (~40B active, MIT) that leads open models on Artificial Analysis' Intelligence Index (51 — the top open-weights score) while its Z.ai API list price ($1.40 in / $4.40 out) runs roughly one-sixth the closed frontier, and open-weight hosts price it lower still. It adds selectable High and Max thinking-effort reasoning modes for long-horizon coding. Its vendor-aggregate SWE-bench Pro (62.1) edges GPT-5.5's, though independent contamination-resistant runs of the GLM family land far lower, so its coding lead is softer than the headline suggests. Its 1M-token context holds an entire mid-sized codebase, and it ships as a drop-in Anthropic-compatible backend for Claude Code workflows — a value challenger rather than a frontier-reliable autonomous agent.