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Next.js + OpenAI — AI-Powered Products
GPT-4, embeddings, and function calling integrated into a production web app.
Technologies
Next.js
Full-stack framework with API routes
OpenAI API
GPT-4, embeddings, and function calling
Vercel AI SDK
Streaming responses and chat UI
Supabase + pgvector
Vector storage for RAG
LangChain
Agent orchestration for complex workflows
Why this stack
- ✓Vercel AI SDK provides streaming chat UI with minimal code
- ✓pgvector in Supabase stores embeddings for RAG without a separate vector DB
- ✓API routes keep OpenAI keys server-side — never exposed to clients
- ✓Function calling lets GPT trigger real actions (bookings, searches, payments)
Best for
AI chatbotsDocument Q&AContent generation toolsAI copilotsSemantic search
Timeline
21–28 days
Starting price
From $4,500
FAQ
How much do OpenAI API costs run?
For an MVP with 100–500 daily users, expect $50–$200/month. GPT-4o-mini is 10× cheaper than GPT-4 for most use cases. We optimize prompts to minimize token usage.