Fine-tuning GPT models or using prompt engineering with OpenAI's API allows automatic code generation based on natural language descriptions.
Here is the code snippet you can refer to:

In the above code we are using the following key points:
- Prompt Engineering: Provides clear task descriptions for improved accuracy.
- Fine-Tuning: Customizes models for specific programming needs.
- Retrieval-Augmented Generation (RAG): Integrates knowledge bases for better results.
- Temperature Control: Adjusts creativity vs. accuracy in responses.
- Error Handling & Debugging: Ensures generated code is valid and efficient.
Hence, by referring to above, you can code generator using GPT models.