Claude Fable 5.1 & GPT-6 Astra packages are live

lazy-loading

Performance

Deferring work until it is needed — components, images, data and third-party scripts — without creating waterfalls or hurting the metrics you meant…

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.