Responses API rejects base64 `input_image` data URIs longer than ~65,520 chars with `invalid_payload` / “is not a valid absolute URI”

调用 Responses API 并以 base64 data URI 形式传入 input_image 时,如果单个 image_url 字符串超过约 65,520 个字符,服务端会返回 invalid_payload / “is not a valid absolute URI”。优先确认单张图








