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ChatGPT API 怎么购买？按 OpenAI 官方文档讲清企业开通 API 的流程：支持地区与主体、充值与用量层级、项目和服务帐号密钥、GPT-6 价格，以及数据出境合规要点。
How do I get an API key for ChatGPT? Create an OpenAI API key step by step: account, project, key type, billing credits, first request, rotation and security.
ChatGPT API pricing checked 13 Nov 2026: chat-latest costs $5/$30 per 1M tokens. How API billing differs from ChatGPT plans, free API credits and monthly examples.
OpenAI API pricing checked 13 Nov 2026: GPT-6 Astra, 6.1 Sol, Terra and Luna per-1M-token prices, Batch/Flex, Fast mode, caching, tools, plus a cost calculator.