Errors

Status	Code	Meaning
400	`invalid_request`	Malformed JSON or a missing field
401	`invalid_api_key`	Missing, revoked or mistyped key
403	`forbidden`	Key lacks access to the model or tool
404	`not_found`	Unknown route or model
429	`rate_limit_exceeded`	Slow down and retry
503	`upstream_unavailable`	Provider outage, see status