GLM-5.2 passes community vibe check; Z.ai forecasts open Fable-class model by December

[AINews] GLM > GPT? GLM-5.2 passes vibe check; Z.ai forecasts Open Fable by December

Zhipu's GLM-5.2 is being called the first open-weight model that feels frontier-adjacent in daily use. Jeremy Howard rated it at least as good as Opus 4.8 and GPT-5.5, though it lacks vision. Artificial Analysis placed it above GPT-5.5 on a new knowledge-work eval. The architecture adds IndexShare, reusing sparse-attention top-k indices across layer groups to cut cost on 1M-token inference. Z.ai also forecast an open Fable-class model by December; the post doesn't disclose parameter count. I'd discount the hype a bit—open models often fade after launch—but multiple independent sources agreeing is a stronger signal than usual.

Why it matters: GLM-5.2 is independently rated as frontier-level in daily use by multiple sources, with Jeremy Howard and Artificial Analysis both giving positive comparisons — the first time an open model is seriously discussed at this tier. Deduction because the body is a paywalled newslett...