The best Z.ai model for writing is GLM 5.2 — 51.1 intelligence with the context to hold a full long-form draft. GLM 5.1 (40.2) and GLM 5 (39.5) round out the top three.
The best AI models for writing — drafting, editing, long-form content and creative work — ranked by general capability (the Artificial Analysis Intelligence Index) among models with the context to hold a full draft. There is no single writing benchmark, so this ranking uses overall intelligence as the proxy that correlates best with prose quality, restricted to models with at least 100K tokens of context.
The best Z.ai model for writing is GLM 5.2 — 51.1 intelligence with the context to hold a full long-form draft. GLM 5.1 (40.2) and GLM 5 (39.5) round out the top three.
GLM 5.1 (40.2) is the closest alternative on this metric, followed by GLM 5 (39.5). See the full ranking above for the tradeoffs.
modelgrep tracks 12 Z.ai models with live benchmarks, speed, latency and per-provider pricing, led on intelligence by GLM 5.2. 11 of them qualify for this ranking.