Providing temporary use of online non-downloadable software for conversational digital assistants using artificial intelligence technology, namely, pre-trained large language models and generative pre-trained transformer type large language models, in connection with conversing with financial institution customers and employees; Application service provider featuring application programming interface (API) software for conversational digital assistants using artificial intelligence technology, namely, generative pre-trained transformer type large language models, in connection with conversing with financial institution customers and employees; Software as a service (SAAS) services featuring software for conversational digital assistants using artificial intelligence technology, namely, pre-trained large language models and generative pre-trained transformer type large language models, in connection with conversing with financial institution customers and employees