BATCH-API

Caching a shared prompt cut our worked example by about 78-80% on four models; batch takes 50% off at most providers but 40% at Moonshot and 20% at xAI. Only Anthropic, Fireworks and xAI say the two stack. The math, the assumptions and the quotes.

How to ship Claude's Batch API in production. 50% cost savings, TypeScript SDK code, JSONL request format, and the async architecture gotchas that bite at 100k requests.