Best gpt model for Roblox studio + blender?

A user is seeking recommendations for the best GPT model to use with Roblox Studio and Blender, as their current model, astra 6, consumes credits too quickly. They utilize GPT for various tasks including generating models for Blender to import into Roblox Studio, map building, and scripting, essentially using it for all aspects of their development process. They are looking for a more credit-efficient and effective alternative.