Claude Fable 5.1 & GPT-6 Astra packages are live

queues

Backend

Message queues that do not lose or duplicate work — acknowledgement, idempotent consumers, retries with backoff, dead-letter queues, and ordering.

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.