Cost and billing

Credits, per-response cost, preflight estimates, budgets and spend caps, cost export, and margin transparency.

Placeholder — the architect writes this chapter.

Features

Streaming, tool calling, structured outputs, prompt caching, multimodal input, speech, image and video generation, and the Batch API.

Reliability

Failover and attempt disclosure, circuit breakers, the full error taxonomy, idempotency, and status.