Short answer: an AI chatbot typically costs around $5,000–$20,000 for a simple FAQ or lead-capture bot, $20,000–$60,000 for an LLM-powered chatbot that answers questions from your own documents and website, and $60,000–$150,000+ for a custom AI assistant that connects to your systems and takes actions. On top of the build cost, budget for monthly AI model usage, hosting and maintenance.
AI chatbot cost by type
| Chatbot type | What it does | Approximate build cost* | Typical timeline |
|---|---|---|---|
| Rule-based / FAQ bot | Answers common questions from fixed flows, captures leads | $5,000–$20,000 | 2–4 weeks |
| LLM chatbot with your knowledge base | Understands natural language and answers from your documents, website and policies (RAG) | $20,000–$60,000 | 1–3 months |
| Custom AI assistant with integrations | Connects to CRM, ERP, booking or order systems; looks up data and takes actions | $60,000–$150,000+ | 3–6 months |
| AI features inside an existing app | Chat, search, summaries or recommendations added to your product | $15,000–$80,000 | 1–3 months |
*Approximate ranges for agency-built solutions in 2026. Your cost depends on scope, integrations and security requirements.
What affects the cost of an AI chatbot?
- Intelligence level: fixed flows are cheap; LLM understanding and reasoning cost more.
- Knowledge sources: how many documents, websites and databases the bot must learn from, and how often they change.
- Integrations: CRM, helpdesk, booking, payments, ERP or internal APIs.
- Actions: answering questions is simpler than booking appointments, updating records or processing orders.
- Channels: website widget, mobile app, WhatsApp, Microsoft Teams or Slack.
- Languages: multilingual bots need extra testing.
- Security and privacy: handling personal or regulated data adds design, testing and hosting requirements.
- Human handover: passing conversations to live agents with full context.
Ongoing costs
| Cost | What it covers | Typical range* |
|---|---|---|
| AI model usage | Charges from the LLM provider, based on the number and length of conversations | From tens to thousands of dollars per month, depending on volume |
| Hosting and vector database | Servers, storage and search for your knowledge base | $50–$1,000+ per month |
| Maintenance and improvement | Updating content, monitoring answers, improving prompts and fixing issues | Often 15–20% of the build cost per year |
Choosing the right model for each task, caching common answers and limiting response length keep usage costs under control.
How an LLM chatbot is built
- Discovery: goals, users, top questions and success metrics.
- Knowledge preparation: collect and clean documents, FAQs and website content.
- Retrieval (RAG): index content so the bot finds the right information before answering.
- Conversation design: tone, guardrails, fallback answers and human handover.
- Integrations: connect CRM, booking or order systems where needed.
- Testing: accuracy, safety, security and load testing with real questions.
- Launch and monitoring: review conversations, measure resolution rates and improve.
Build vs buy
Off-the-shelf chatbot tools are quick to start and suit simple website FAQs. A custom chatbot makes sense when you need answers from your own data, integrations with your systems, control over privacy and branding, or AI features inside your own product.
How to reduce AI chatbot cost
- Start with the top 20–50 questions your customers ask.
- Use retrieval from your existing content instead of training a custom model.
- Launch on one channel first, then expand.
- Add actions and integrations in later phases.
- Monitor conversations and improve the knowledge base continuously.
AI products we have built
Our team has built AI features into real products, including Sport Betting IQ (LLM-powered sports insights in a Flutter app), MomoMi (a crypto wallet with LLM features) and Careerails (AI candidate matching for recruitment). See our AI chatbot development services or request a free estimate.
Frequently asked questions
Simple FAQ bots cost around $5,000–$20,000, LLM chatbots using your own content around $20,000–$60,000, and custom AI assistants with integrations $60,000 or more.
Expect AI model usage fees based on conversation volume, hosting and storage for your knowledge base, and ongoing maintenance.
A simple bot can launch in a few weeks; an LLM chatbot with your knowledge base usually takes 1–3 months.
Yes. Using retrieval-augmented generation (RAG), a chatbot can answer questions from your documents, website and policies.
It can be, with access controls, data encryption, careful choice of AI provider, and rules that stop the bot sharing sensitive information.
