"Buried in phone and email," "missing after-hours inquiries" — these are exactly what an AI chatbot improves. This article, by a Chiba AI-adoption firm, plainly explains AI chatbot costs, pricing by type, and how to choose without failing.
- AI chatbot pricing varies widely by type: SaaS (setup 0-100K yen, monthly 5K-50K yen), AI-powered SaaS (setup 100K-500K yen, monthly 30K-300K yen), and custom-built (setup 500K-3M yen, monthly 50K-300K yen).
- Our own custom AI chatbot (MRI Inc.) is offered from 0 yen setup and 98,000 yen/month (excl. tax).
- In a sample calculation with 300 inquiries per month and 60% automation, the estimated labor-cost savings are around 60,000 yen per month — an illustrative model, not a guarantee.
- Subsidies such as the Digitalization/AI Adoption Subsidy (up to 4.5M yen, 1/2-2/3 coverage) can reduce net cost in some cases, but eligibility and screening vary.
AI Chatbot Cost Guide [Comparison Table]
AI chatbot costs vary greatly depending on which type you choose. There are broadly three pricing types (plus a hybrid approach that combines them).
| Type | Initial cost (guide) | Monthly fee (guide) | Best suited for |
|---|---|---|---|
| SaaS — FAQ/scripted type | ¥0–100,000 | ¥5,000–50,000 | Routine inquiries; low-cost trial |
| SaaS — AI-powered (generative AI) | ¥100,000–500,000 | ¥30,000–300,000 | Free-form questions; want to use generative AI |
| Custom-built type | ¥500,000–3,000,000 ※ MRI: from ¥0 initial |
¥50,000–300,000 ※ MRI: from ¥98,000/mo (excl. tax) |
Tailored to your workflows and systems |
* Costs are general market benchmarks as of June 2026 and vary by features, scale and support.
What you pay for: cost breakdown
Understanding what drives initial and monthly costs makes it easier to compare quotes.
Initial cost breakdown
| Item | Description |
|---|---|
| Requirements & design | Scoping what to automate; designing conversation flows |
| Development & build | Building the chatbot engine; integrating with existing systems (CRM, etc.) |
| FAQ / content prep | Creating initial Q&A data; preparing training data |
| Testing & verification | Checking behavior; refining scenarios |
| Infrastructure setup | Server and security environment |
Monthly fee breakdown
| Item | Description |
|---|---|
| Server / infrastructure | Cloud / server costs for running the chatbot |
| AI engine / API licence | Generative-AI usage fees (may vary with conversation volume) |
| Maintenance & support | Incident response, improvement suggestions, log analysis |
| Additional customisation | Feature additions, scenario expansions (as needed) |
Types compared: features & best-fit
① SaaS — FAQ / scripted type
Guides users through pre-set Q&A. Answers are stable and predictable, making this ideal for industries with routine inquiries (manufacturing, retail, service businesses).
- ✅ Low entry cost (from ¥5,000/month)
- ✅ High answer accuracy, low hallucination risk
- ❌ Cannot handle questions outside the script
- ❌ Not suited to free-form questions
② SaaS — AI-powered (generative-AI) type
Uses ChatGPT and similar to give natural, flexible answers. Accuracy improves when it learns your FAQ and manuals.
- ✅ Handles free-form questions naturally
- ✅ Adaptable to a wide range of industries and use cases
- ❌ Needs safeguards against wrong answers (hallucinations)
- ❌ API costs rise with usage volume
③ Custom-built type
Designed and built entirely around your workflows and existing systems. Chosen when SaaS falls short for complex processes or deep integration with kintone, Salesforce, etc.
- ✅ Fully optimised to your operations
- ✅ Deep integration with existing systems
- ✅ Keep confidential data on-premises
- ❌ Higher initial and monthly costs than SaaS
- ❌ Takes time to develop and deploy
④ Hybrid type (scripted + generative AI)
An increasingly popular approach: scripted responses handle common questions reliably, while generative AI takes over for anything outside the script. This balances answer stability with broad coverage — ideal when you want to reduce hallucination risk while expanding scope.
- ✅ High accuracy for routine questions; flexible AI for edge cases
- ✅ Wider coverage with controlled hallucination risk
- ❌ Requires careful design of the script/AI boundary
What determines an AI chatbot's price? 4 factors behind the quote
Even for the same "AI chatbot," quotes can range from tens of thousands to several million yen. Where your price lands is mainly determined by a combination of the following four factors.
| Factor | Effect on price |
|---|---|
| ① Whether and which AI is used | Scripted vs. generative-AI type. Generative-AI types tend to add metered API usage fees. |
| ② Number of system integrations | The more integrations (LINE, CRM, kintone, Salesforce, etc.), the more development effort. |
| ③ Expected conversation volume / users | For generative-AI types, API costs vary with conversation volume. |
| ④ Degree of customisation | Using an off-the-shelf SaaS as-is vs. building around your own workflows. |
So when comparing quotes from several vendors, align the assumptions — which type, which integrations, and expected conversation volume — before you compare.
3 viewpoints when comparing pricing and quotes
- ① What "¥XX,000/month" includes: check whether metered API usage and customisation are billed separately.
- ② Look at total cost (initial + monthly, TCO): a ¥0 initial fee may come with a higher monthly, and vice versa.
- ③ ROI at your expected volume and automation rate: judge alongside the ROI calculation example.
A 3-minute AI assessment shows how much an AI chatbot could help your operations (a rough ROI guide).
🎯 Free AI Assessment (3 min) 💬 Free 1-on-1 consultation
Use-case guide: LINE integration & free plans
AI chatbot with LINE integration
For industries where customer contact happens on LINE (retail, food & beverage, services, classes, etc.), an AI chatbot linked to your LINE Official Account is a strong option. It can automate reservations, FAQ responses, coupon delivery and more. SaaS-type LINE-integrated solutions typically start at ¥10,000–100,000/month; custom-built options start from around ¥500,000 initial cost, plus a separate LINE Official Account monthly fee (from approx. ¥5,000/month depending on your plan).
Free AI chatbot plans: what to expect
Demand for free chatbots is high, but free plans typically impose limits on messages, scenarios, users, or AI responses. The realistic path is to test the tool on a free plan, then move to a paid tier for full business use. For generative-AI types, be aware that exceeding the free usage quota triggers API charges.
ROI calculation example
To judge whether a monthly fee is worthwhile, a quick ROI estimate helps.
Example: comparing against current inquiry-handling costs
| Condition (example) | Current (staff) | After AI chatbot |
|---|---|---|
| Monthly inquiry volume | 300 inquiries/month | |
| Time per inquiry | 10 min | Automate 60% of routine → handle 120 effectively |
| Labour cost (¥2,000/hr) | ¥100,000/mo (300×10min×¥2,000/60) | ¥40,000/mo (120×10min×¥2,000/60) |
| Estimated saving | approx. ¥60,000/month in workload | |
| Chatbot cost (monthly) | — | ¥30,000–100,000/mo (varies by type) |
* This is a model illustration. Actual results vary by industry, inquiry content and current setup.
① Monthly inquiries × minutes per inquiry ÷ 60 × hourly labour cost = current monthly cost
② Estimate the automation rate (higher for FAQ-heavy operations)
③ If ①×② saving ≥ chatbot monthly fee → positive ROI
How to choose & adoption steps
5 things to check before deciding
- Placement: your website / LINE / internal tools (Slack, Teams, etc.)
- Human handoff: can complex cases reach staff smoothly?
- Training data: can it reflect your FAQ/manuals/product info?
- Security: handling of personal/confidential data (vital for generative type)
- Ease of operation: can your staff add/edit answers themselves?
3-step adoption sequence
| STEP 1 | Organise FAQs — list the questions you actually get most (80% of quality) |
|---|---|
| STEP 2 | Launch small — start with key questions and watch for gaps |
| STEP 3 | Improve with logs — add unanswered questions monthly to raise accuracy |
For the big picture, see SME AI adoption — where to start? 5 steps.
Subsidies to cut your AI chatbot costs
AI chatbot adoption may qualify for national grants in Japan.
| Grant name | Max. amount | Subsidy rate | Coverage |
|---|---|---|---|
| Digitalisation / AI-adoption grant (standard tier) | Up to ¥4,500,000 | 1/2–2/3 | IT & AI tool adoption in general |
| Labour-saving investment grant | Up to ¥15,000,000 | 1/2 | Automation investments addressing labour shortages |
Qualifying applicants may cut their effective cost to less than half. See 2026 subsidies for SMEs in Chiba adopting AI for details.
Sort it out in a free 1-on-1 consultation
FAQ
What is the typical monthly fee for an AI chatbot?
SaaS FAQ/scripted type: approx. ¥5,000–50,000/month. AI-powered SaaS type: approx. ¥30,000–300,000/month. Custom-built type: approx. ¥50,000–300,000/month. Actual costs vary by features, scale and support level.
How much is the initial cost for an AI chatbot?
Simple SaaS type: approx. ¥0–100,000 initial. AI-powered SaaS: approx. ¥100,000–500,000. Custom-built: approx. ¥500,000–3,000,000. MRI Inc.'s custom AI chatbot starts from ¥0 initial cost.
Can I use an AI chatbot for free?
Some SaaS products offer a free plan, but free tiers typically cap messages, scenarios, users, or AI responses. For full business use, upgrading to a paid plan is the common path. Generative-AI types may also incur API fees once you exceed the free quota.
What does LINE-integrated AI chatbot cost?
SaaS-type LINE-integrated solutions typically start at ¥10,000–100,000/month. Custom-built options start from around ¥500,000 initial. A separate LINE Official Account monthly fee (from approx. ¥5,000/month) may also apply.
How much can subsidies reduce AI chatbot costs?
Under Japan's Digitalisation / AI-adoption grant (standard tier), the subsidy rate is 1/2–2/3 with a maximum of ¥4,500,000. Qualifying businesses may cut their effective cost to less than half. See the subsidy guide for details.
What types of AI chatbots are there?
There are broadly three pricing types (plus a hybrid approach that combines them): ① scripted/FAQ type, ② AI-powered (generative AI) type, ③ custom-built type, and ④ hybrid type (scripted + generative AI). The scripted and hybrid types suit high-volume routine inquiries; the generative-AI type suits free-form questions.
What is the typical AI chatbot cost for an SME?
A realistic path is to start small with a SaaS type (about ¥0–100,000 initial, ¥5,000–50,000/month), then move to a custom-built type when you need it tailored to your operations (MRI: from ¥0 initial and ¥98,000/month, excl. tax). Subsidies can reduce the net cost in some cases.
How is the price of an AI chatbot determined?
The price is mainly determined by a combination of ① whether and which AI is used (scripted vs. generative-AI type), ② the number of system integrations, ③ the expected conversation volume and number of users, and ④ the degree of customisation. Note that generative-AI types incur metered API fees based on conversation volume.
Related:
・Custom AI & RAG Development Cost Guide [2026]
・AI for Restaurants & Hotels｜Multilingual, bookings, labor shortage
・SME AI adoption — where to start? 5 steps
・2026 subsidies for SMEs in Chiba adopting AI
* This article reflects general information as of June 2026. Effects and costs vary by industry, inquiry volume and current state. Check each program's official site for the latest subsidy requirements and deadlines.