Try to find you $:/plugins/NoteStreams/WikiSage/model-list file and add models manually. My list is:
gemini-2.5-pro-exp-03-25
gemini-2.5-flash-preview-04-17
gpt-4.1-nano
gpt-4.1-mini
gpt-4.1
gpt-4o-mini
o4-mini-2025-04-16
gpt-4o-mini-tts
gpt-4.5-preview-2025-02-27
gpt-4.5-preview
chatgpt-4o-latest
gpt-4o
gpt-4
gpt-3.5-turbo
gpt-4o-2024-08-06
gpt-4.5-preview-2025-02-27
dall-e-3
o1-preview
claude-3-opus-20240229
claude-3-sonnet-20240229
claude-3-haiku-20240307
claude-3-5-haiku-latest
claude-3-5-sonnet-latest
That should fix the availability of the models in the list.
I don’t know why the AI coder would work while the chat would not, I would start by looking at the tiddler $:/plugins/NoteStreams/WikiSage/gemini-api-key and seeing if it’s actually there.
These are not problems I’ve encountered, so I’ll make sure to do some more extensive testing before the next release 
That will be in the next release, as well as the journal widgets 



