gpt-image-2-all 500 errors usually mean a content-policy hit — When you see 500 Internal Server Error with message 未接收到上游响应内容 (“no upstream response received”), the prompt or reference image typically tripped upstream content policy (e.g., named celebrities, copyrighted characters — “LeBron James from the Lakers” will fail outright). The call isn’t billed and retries won’t help; guide the user to revise the prompt.
📖 Official relay vs. reverse: /en/api-capabilities/gpt-image-2/vs-gpt-image-2-all
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