I just updated my ‘Generate Alt Text with OpenAI Vision’ shortcut to version 1.2:

• Updated to use the gpt-4o model (the gpt-4-vision-preview model is being deprecated by OpenAI)
• Substituted a simple ‘Copy to Clipboard’ as the final action instead of ‘Stop and Output’ because it was creating new text files in the file system for users running it as a Quick Action
• Updated the instructional prompt to try to cut down on unnecessarily wordy transcriptions

Get it from the HeyDingus Shortcuts Library.