Claude Fable 5.1 & GPT-6 Astra packages are live

x.ai

Design

An inspired interpretation of xAI's design language — Elon Musk's frontier-AI company whose web surface is a strict near-black canvas broken only by…

Choose your model

Available for 11 model families. The engineering substance is the same in each; the structure, checklist phrasing and constraint ordering are tuned per family.