A user input message with an image, or “additional messages” with an image added (depicted), results in an error, replicated by sending the same to either “gpt-4.5-preview” or “gpt-4o-2024-11-20” or others.
The image was placed by pasting a clipboard of image contents into the text focus, where it appeared.
Instead linking right to a forum topic’s image URL with a paperclip press populates the UI with the image, but then sending fails - a quick timeout continues, even upon retries, same with another image source:
Those users having continuous use and now report problems are likely not on the Responses endpoint.
The timeout error on internet URL has been fixed, confirmed locally, but base64 data URL still has the same “An error occurred while processing your request”.
Chat Completions and Responses on the API Playground are sending the same base64 encoding. One just fails. The same trying base64 locally.
The Playground is forming the request properly, otherwise the validation would bounce it:
And OpenAI really wants a model to know it can see, even with no image, jamming another system message on the context end right into the existing assistant writing prompt…