Learn to fine-tune GPT-4.1 models with custom data and build a production-ready chat application using Next.js 15. The guide covers scraping and preparing training datasets in JSONL format, submitting data to OpenAI for supervised fine-tuning, and creating a modern chat interface with real-time streaming responses using the Vercel AI SDK and shadcn/ui components. Includes complete code examples for data preparation scripts, API route integration, and frontend implementation with proper error handling and UX considerations.
Table of contents
Table of Contents:Understanding Fine-TuningPrerequisitesStep 1: Dataset PreparationStep 2: Fine-Tuning SubmissionStep 3: Next.js Application SetupStep 4: Building the Chat InterfaceStep 5: API Route IntegrationStep 6: Testing Your ApplicationConclusionSort: