Send images to the OpenAI Responses API for vision analysis by URL, base64, or file_id, and generate images with the image_generation tool

Documented steps

1. POST https://api.openai.com/v1/responses with 'Authorization: Bearer <API_KEY>' and a vision-capable model.
2. For image input, add a content item of type 'input_image' alongside your text content.
3. Supply a hosted image as {"type":"input_image","image_url":"https://..."}.
4. Or supply inline data as {"type":"input_image","image_url":"data:image/jpeg;base64,<BASE64>"}.
5. Or reference an uploaded file as {"type":"input_image","file_id":"file-..."} after uploading through the Files API.
6. Optionally set 'detail' to 'auto' (default), 'low', 'high', or 'original' to trade image analysis precision against token cost.
7. Send the request and read the model's analysis from output_text or the message item as usual.
8. For image GENERATION instead, put your prompt in 'input' and add tools:[{"type":"image_generation"}].
9. Find the output item of type 'image_generation_call' and read its 'result' field, which holds base64-encoded image data.
10. Decode the base64 result and write it to disk as a PNG or your chosen format.
11. Verify which underlying image model your account uses, since image generation is billed by model rather than a flat per-call rate.