RAMADDA uses OpenAI's GPT API for extracting keywords and text summaries for documents (PDF, Word, etc). To enable this you will need to register with OpenAI and obtain an API key. They provide a free tier.

Once you obtain the API key add it to a .properties file in your RAMADDA home directory:

gpt.api.key=<your key>

RAMADDA uses the gpt-3.5-turbo which costs $0.002 / 1K tokens. Each of the document extraction actions described below (title, author, summary, keywords) require one call and approximately 3K - 4K tokens are passed to OpenAI. So, each call is approximately 1/2 to 1 cent per call. Now, when you go to add a document entry to RAMADDA under the "More..." section select Extract keywords and/or Extract Summary. Any keywords extracted will be added as metadata and the summary will be pre-prended to the new entry's description.
The Wiki editor provides an interface to the GPT api. If GPT is enabled there will be a GPT link Under the Etc... menu. This brings up the below dialog. Any text that is selected in the wiki editor will be added to the input area. When Evaluated the prompts and the input text are sent to GPT and the result is placed in the Results area. You can then either replace the selected text with the results or append the results.
Also under the Etc... menu is a Transcription service. You can record audio through your browser and then the audio is sent to OpenAI's Whisper API for transcription to text.

Note: this does not appear to work with Safari as the .mp4 audio file format Safari creates is not accepted by OpenAI.