# How Much Does It Cost to Build an AI Chatbot?

- Tool: Development Cost
- Last updated: November 2026

## TL;DR

An AI chatbot costs $5,000 to $25,000 for a simple rule-based or FAQ bot, $12,000 to $60,000 for a custom chatbot that answers from your own content, and $100,000 to $250,000 or more for an enterprise, action-taking bot. Running a custom chatbot typically costs $60 to $1,300 a month in LLM fees at 10,000 conversations, often cheaper than per-resolution pricing from an off-the-shelf SaaS tool at that volume.

## Chatbot cost by type

A scripted, rule-based bot and an AI chatbot that answers from your own documents are different builds at different price points, and a lot of 'chatbot cost' confusion comes from guides mixing the two together under one number.

| Tier | Examples | Cost | Timeline |
| --- | --- | --- | --- |
| Rule-based / FAQ bot | Scripted decision tree, no model-generated answers | $5,000-$25,000 | 2-4 weeks |
| Custom RAG chatbot (small/offshore team) | AI-generated answers over your own docs, 1-2 integrations | $12,000-$25,000 | 6-9 weeks |
| Custom RAG chatbot (US mid-market) | Same scope, built by a US-based team | $60,000-$120,000 | 8-14 weeks |
| Multichannel chatbot | Same AI core, deployed across web, SMS, and messaging apps | $60,000-$100,000 | 16-24 weeks |
| Enterprise / agentic chatbot | Takes actions, not just answers; deep system integrations | $100,000-$250,000+ | 24-36 weeks |

## What each add-on costs

| Feature | Cost range | Notes |
| --- | --- | --- |
| Each extra channel (SMS, WhatsApp, etc.) | +$3,000-$8,000 | On top of the base web chatbot |
| Each tool or CRM integration | +$5,000-$15,000 | Scheduling, order lookup, ticketing systems |
| Large knowledge base (100,000+ documents) | +$10,000-$20,000 | Indexing and retrieval tuning at scale |
| HIPAA or PII compliance | +$15,000-$30,000 | Required for health or sensitive personal data |
| Fine-tuning | +$10,000-$25,000 | Rarely needed; most use cases work on prompting alone |
| Voice | +$10,000-$20,000 | Phone or voice-channel support |
| Actions (bookings, refunds) | +$8,000-$20,000 | The bot does something, not just answers |
| Document prep and cleanup | 30-50% of the build | Usually the most underestimated line item |

## Running cost per conversation (worked math, Nov 2026 prices)

Worked example: a support bot turn using 8,000 input tokens (system prompt, tools, history, and retrieved docs) plus 500 output tokens, over a 6-turn conversation.

| Model | Per turn | Per conversation | 10,000 conversations/mo |
| --- | --- | --- | --- |
| Claude Sonnet 5.5 / GPT-6.1 Sol, uncached | 8K x $2/1M + 0.5K x $10/1M = $0.021 | $0.126 | $1,260 |
| Claude Sonnet 5.5, 7K of 8K tokens cached | $0.0077 | $0.046 | $462 |
| Claude Haiku 5.5 / GPT-6 Luna | $0.00105 | $0.0063 | $63 |
| Gemini 3.8 Flash (price doubles Jan 1 2027) | $0.0079 | $0.047 | $474 (about $950 after Jan 1 2027) |

Add a vector database at $0-$50/mo (free with Supabase pgvector, or Pinecone's Builder tier at $20/mo), maintenance at 15-20% of build cost per year, and integration upkeep of $500-$1,500/mo if the bot is wired into other systems.

## Buy an off-the-shelf bot, or build custom

At 10,000 conversations a month with roughly half resolved by the bot, the math tips toward a custom build. Intercom's Fin at $0.99 per resolved outcome runs about $4,950/mo for 5,000 resolutions; Zendesk's $1.50-$2.00 per automated resolution runs $7,500-$10,000/mo plus seats. A custom chatbot on a cached Claude Sonnet 5.5 setup costs roughly $462 in model fees plus about $50 in infra. A $15,000-$25,000 custom build pays back against Fin in about 4 months at that volume. Below roughly 500 conversations a month, the SaaS tool is cheaper.

| Product | Price |
| --- | --- |
| Chatbase | Hobby $40/mo ($32 annual, 700 credits); Standard $150/mo ($120); Pro $500/mo ($400); extra credits $40 per 1,000 |
| Tidio (Lyro) | Starter $24.17/mo; Growth from $49.17/mo; Plus from $300/mo; Lyro from $32.50/mo per 50 conversations |
| Botpress | Free up to 100 conversations/mo; Plus $150/mo annual (+$0.65/conversation over); Team $750/mo annual (+$0.50/conversation over) |
| Fin (Intercom) | $0.99 per resolved outcome, 50/mo minimum; Intercom seats $29-$132/mo |
| Zendesk | Suite Team $55 or Professional $115 per agent/mo (annual); $1.50-$2.00 per automated resolution |

## Costs people forget

- Knowledge-base cleanup, typically 30-50% of the build, before the bot can answer accurately at all
- Hallucination handling and a clean handoff to a human when the bot doesn't know the answer
- Per-resolution SaaS fees that scale with success. The more the bot resolves, the more the vendor charges
- Vague definitions of 'resolution' in vendor pricing, which can count a non-reply as a resolved outcome
- A refresh pipeline for the knowledge base as your content changes, often +$5,000-$20,000 to build
- Maintenance of 15-20% of build cost per year as the underlying model and your content both shift

## How to spend less without regretting it

- Start on Chatbase or Tidio to learn what people actually ask before committing to a custom build
- Use pgvector inside a database you already have instead of standing up a separate vector database
- Route simple lookups to a cheap model like Haiku or Luna, and reserve Sonnet-class models for the hard questions
- Cache the system prompt and retrieved context. It's the biggest single lever on per-conversation cost
- Scope document cleanup and a refresh pipeline into the original quote instead of discovering it mid-project
- Skip voice and action-taking features in version one unless the core Q&A use case is already working well

## Frequently asked questions

### How much does it cost to build a chatbot?

A rule-based or FAQ chatbot costs $5,000 to $25,000. A custom AI chatbot that answers from your own content runs $12,000 to $60,000 depending on team location, and an enterprise, action-taking bot climbs to $100,000-$250,000 or more.

### Why do chatbot development cost estimates vary so much?

A lot of the spread is team location, not scope. The same custom RAG chatbot scope runs $12,000-$25,000 with a small or offshore team and $60,000-$120,000 with a US mid-market agency. Always ask which team and region a quote assumes.

### How long does it take to build an AI chatbot?

A rule-based FAQ bot can ship in 2-4 weeks. A custom chatbot that answers from your own documents typically takes 6-16 weeks, and a multichannel or enterprise bot runs 16-36 weeks.

### How much does it cost to run an AI chatbot per month?

At 10,000 conversations a month, a custom chatbot on Claude Sonnet 5.5 costs about $1,260/mo uncached, or roughly $462/mo with prompt caching on the repeated parts of the prompt. That's often cheaper than per-resolution SaaS pricing at that volume.

### Should I use Chatbase or Tidio instead of building a custom chatbot?

Below roughly 500-1,000 conversations a month, yes. Off-the-shelf tools like Chatbase (from $40/mo) or Tidio's Lyro (from about $24/mo) are cheaper than a custom build at low volume. Past that, a custom build on your own content usually wins on cost and control.

### What's the biggest hidden cost in a chatbot project?

Cleaning up the knowledge base the bot will answer from. It's commonly 30-50% of the total build, and skipping it is the main reason AI chatbots give wrong or outdated answers after launch.

### Does RapidDev build AI chatbots?

RapidDev's $13,000-$25,000 fixed-price band covers a custom RAG chatbot on your own content with an admin CMS and login, priced at $14,000-$18,000 over 6-8 weeks in a representative scope. Omnichannel enterprise bots and very large knowledge bases are outside that range.

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Source: https://www.rapidevelopers.com/cost/ai-chatbot-development-cost
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