https://techcrunch.com/2023/06/13/openai-intros-new-generative-text-features-while-reducing-pricing/

As the competition in the generative AI space grows fiercer, OpenAI is upgrading its text-generating models while reducing pricing.

Today, OpenAI announced the release of new versions of GPT-3.5-turbo and GPT-4, the latter being its latest text-generating AI, with a capability called function calling. As OpenAI explains in a blog post, function calling allows developers to describe programming functions to GPT-3.5-turbo and GPT-4 and have the models create code to execute those functions.