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Getting error code 400 on both Vision and PDF base64 input - Response API

OpenAI Developer Community June 6, 2026
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Well, I fixed it: Both Vision and PDF base64 issues:

Images : The curly brackets needed to be removed.

“type”: “input_image”, “image_url”: “data:image/jpeg;base64, {base64_image}

PDFs : The space before base64_file needed to be removed.

“file_data”:“data:application/pdf;base64, base64_file

Don’t know why these issues were not raised over the last year. Go figure… I quess Codex could have picked it up, but I prefer to keep my brain active - helps when one gets older. Time to take a nap…

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