A practical guide for businesses that want to build an AI app like ChatGPT without training their own model, from an AI development company that builds these products for clients. It explains the three types of AI apps (branded assistant, knowledge-grounded app and agentic product), how to choose between models like GPT, Claude, Gemini and open-source options, and a reference architecture with RAG, guardrails and evaluation. It also covers build and running costs, timelines of 4 to 16 weeks for most projects, common mistakes, and the latest 2026 trends. It’s written for founders, product managers and business owners planning their first AI product.
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