stream=true 推 partial_image 事件)instructions 作为 system prompt 透传X-Codex-Beta-Features / Version 等)n > 1 会被接受但降级为 1 张(Codex 上游限制)background: "transparent" 不支持(gpt-image-2 产品限制)curl --location --request POST 'https://4sapi.com/v1/images/generations' \
--header 'Accept: application/json' \
--header 'Authorization: sk-' \
--header 'Content-Type: application/json' \
--data-raw '{
"model": "gpt-image-2",
"prompt": "cat",
"n": 1
}'{
"created": 1713833628,
"data": [
{
"url": ""
}
]
}