I work at OpenAI. Since Insert is still in beta we really appreciate the feedback! We've found that it's easier to get Insert to work in production settings for code than for natural language. For natural language which I think you are more interested in, we documented some best practices that can help the users succeed here: https://beta.openai.com/docs/guides/completion/inserting-tex... I'd especially recommend trying our new and improved best_of feature.