GPT-5.6 Soul vs Fable 5 vs Grok 4.5 vs GLM 5.2: How They Compare (analysis)
A plain-language rundown of four flagship models from mid-2026 — GPT-5.6 Soul, Fable 5, Grok 4.5, and open-weight GLM 5.2 — what each is tuned for, where to access it, and the trade-offs. Analysis, not a how-to.