How much does it cost to build an AI chatbot?
An AI assistant on your site that answers from your own content 24/7.
Do it yourself with AI — step by step
- 1
Decide scope: pure Q&A/support (Chatbase) vs branching flows + actions (Voiceflow) vs deep helpdesk automation (Intercom Fin).
- 2
Gather + clean the knowledge base: point Chatbase at your sitemap/URLs + upload PDFs; remove outdated/contradictory material first.
- 3
Pick the answering model — Claude (Opus 4.8 / Haiku), GPT-5.5, or Gemini 3.1; cheaper model for FAQs, stronger one for complex queries.
- 4
Write the system prompt/persona: brand voice, scope guardrails ('only answer about [company]; hand off if unsure'), escalation rule.
- 5
Configure actions if needed (order status, book a demo, create a ticket) and test each with real + edge-case inputs.
- 6
Test adversarially before launch: off-topic, ambiguous, hostile questions — confirm it cites your content and never invents prices/policies.
- 7
Embed the widget, match brand colors, set lead capture/analytics, and review conversation logs weekly.
Best AI tools for this
Updated 2026-06-29 — generative-media tools move fast.
Train-on-content site support/Q&A bot + widget
Free / $40 / $150
Visual builder for branching flows + actions
Free / $60 / $150
AI support agent inside a full helpdesk
$0.99 / resolution + seats
Underlying answering model (usually bundled)
Platform credits
Where AI ends and you (or a pro) begins
Ingesting content, drafting answers, suggesting intents/flows, summarizing logs.
Curating the KB, tight guardrails + escalation, adversarial testing for hallucinations on prices/legal/policy, reviewing real transcripts.
When it must integrate with CRM/helpdesk/order systems, handle high volume, take real actions (refunds, bookings), or stay accurate on regulated content.
Find a pro on Fiverr ($45–$520) →Compare every AI model, estimate your build cost, and get a model recommendation.