Popular AppsCost to Build an LLM Customer Support Agent
Cost to Build an LLM Customer Support Agent
LLM Customer Support Agent MVP — comparable to LLM Support Agent
A grounded customer-support assistant that answers from your knowledge base and escalates to humans when needed.
Estimated MVP cost
$14,123
Estimated effort
253 hours
This is a starting estimate for a custom-built MVP, designed and built from scratch. You own all the code and IP with no platform lock-in. Scope, city count, and market change the price. Get an estimate tailored to your idea with ChatStack.
Explore the full PRD used to build this estimate
What’s included
Reduce support ticket volume with accurate, cited answers grounded in company documentation.
Key features
- RAG over help centre and internal docs
- Cited answers with source links
- Human handoff and ticket creation
- Conversation history and feedback
- Admin analytics on deflection rate
Platforms
- Web chat widget and agent console
Who it’s for
- Support agents
- End customers via chat widget
Out of scope for this MVP
- PII handling policies
- English-only MVP
- Voice channel deferred
Full cost breakdown
Every line item below is a real feature from the PRD, priced in hours and USD at an AI-accelerated delivery rate. Totals are rounded to the nearest $10.
| Feature | Category | Hours | Cost |
|---|---|---|---|
| Support chat widget, RAG pipeline, agent console, and ticketing integration. | Support Agent | 162 | $8,910 |
| Delivery overhead | |||
| Planning | 18 | $980 | |
| Project Management | 15 | $802 | |
| Testing | 8 | $446 | |
| DevOps | 6 | $356 | |
| Design & Frontend Build | 21 | $1,158 | |
| AI Tokens | 0 | $223 | |
| Security | 8 | $446 | |
| Risk (10% Contingency) | 15 | $802 | |
| Total | 253 | $14,123 | |
Estimate assumptions
- Runtime LLM costs billed separately.
Risks that could change this
- Knowledge base quality affects answer accuracy.
User stories
The full set of user stories behind this estimate, grouped by the person using the app.
Customer
As a customer, I want instant answers from the chat widget so that I do not wait for an agent.
Support Agent
As a support agent, I want to take over conversations when the bot cannot help.
Requirements
Functional and non-functional requirements the estimate above is priced against.
Deliver grounded chat with escalation to human agents.
Requirements assumptions
- Standard secure authentication and English-only MVP.
Technical specification
The reference architecture and stack this estimate is built on.
Hybrid retrieval with re-ranking over indexed help content.
Technical assumptions
- Supabase Postgres with RLS where applicable.
- Hosted on Vercel or AWS.
LLM Support Agent cost FAQs
- How much does an LLM support agent cost?
- About $14,100 for this MVP. You own the code and IP.
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