Now it’s possible to add documents to a thread not only to assistants.
After I made some responsive design optimizations, users who are working in the field can use AI-Assistants, no matter where their work takes them. AI-Assistants to go.
Now you can choose a model: gpt-4o or the brand new, cheaper gpt-4o-mini
Your preview appears broken with 401 errors (seems you removed the key).
Yes I removed API key because I can’t pay for it forever 
New models added:
gpt-4o
gpt-4o-mini
gpt-o1-preview
gpt-4-turbo-preview
New language models (o1-mini and o1-preview) added. Trained with reinforcement learning to perform complex reasoning.
Unfortunatelly o1 models doesn’t work with OpenAI assistants.
Sorry