How likely is that the API will change (from specs, to pricing, to being broken)? I am about to finish some freelance work that uses GPT api and it will be a pa

How likely is that the API will change (from specs, to pricing, to being broken)? I am about to finish some freelance work that uses GPT api and it will be a pain in the ass if we have to switch or find an alternative (even creating a custom endpoint on Azure...)