Batch API

Use the Claude Batch API for cost-sensitive non-realtime work. Learn the submit / poll / retrieve flow, the 50% discount, the 24-hour SLA window, batch-size and concurrency limits, idempotency keys, error handling per request inside a batch, the workloads that fit (overnight backfills, classification at scale, large eval runs), and the workloads that do not (anything user-facing realtime).