Claude Fable 5.1 & GPT-6 Astra packages are live

python-async

Backend

asyncio without the foot-guns — when async is worth it, keeping the loop unblocked, TaskGroup over gather, cancellation and timeouts done correctly,…

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.