Building AI Chatbots with LLM APIs
The Problem
Building a reliable, production-grade AI chatbot is significantly more complex than calling an LLM API and displaying the response. Conversation context management, safety guardrails, cost control, hallucination handling, and graceful degradation on out-of-scope questions all require careful engineering that is not obvious from the API documentation alone.
How AI Helps
- 01.Generates system prompt templates that define the chatbot's persona, domain scope, and fallback behaviour, giving developers a production-ready starting point rather than a blank prompt.
- 02.Writes conversation state management logic for multi-turn conversations: tracking context, summarising old turns, and maintaining user preferences across sessions.
- 03.Designs intent routing: a lightweight classifier that routes simple queries to a fast, cheap model and complex queries to a more capable one, optimising cost and latency simultaneously.
- 04.Generates test cases for safety and quality evaluation: adversarial inputs, out-of-scope questions, and jailbreak attempts that should be handled gracefully.
- 05.Writes the conversation evaluation pipeline — using an LLM judge to score response quality, helpfulness, and safety across a test set — enabling systematic quality monitoring.
Recommended Tools
Build structured AI prompts with role, task, context, and output format fields.
Design multi-step AI prompt chains with variable references between steps.
Visualize AI prompt chain JSON as a vertical flowchart.
Detect prompt injection attacks in text with pattern matching and a 0-10 risk score.
Build content filter rules for LLM output: blocked words, regex patterns, PII detection, and format constraints.
Recommended Models
Example Prompts
FAQ
- Should I use the Assistants API or build a custom conversation loop?
- The Assistants API (OpenAI) provides persistent threads and built-in tool support, which simplifies development for standard use cases. For full control over context management, cost optimisation, and multi-model architectures, build a custom loop with the chat completions API.
- How do I prevent the chatbot from making up information?
- Use RAG to ground responses in verified sources, include "If you don't know the answer from the provided context, say so" in the system prompt, and implement a citation requirement so every claim is backed by a source reference that users can verify.
- How much does a production chatbot cost to run?
- Costs vary enormously by traffic and model. A chatbot serving 10,000 daily active users with 10 messages each, averaging 500 input tokens and 200 output tokens per message, using GPT-4o mini costs approximately $67/day. Using GPT-4o for the same traffic costs $1,125/day. Model selection is the single largest cost variable.
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