AI Chatbot Cost Per Message: Real Prices Across 8 Platforms (2026)

TL;DR: AI chatbot platforms use three pricing models for responses: flat messages, credit-based with multipliers, and unlimited. Boei offers the lowest cost per response at $0.0095 with flat pricing regardless of AI model. Credit-based platforms like Chatbase, Dante AI, and FastBots can cost 5-50x more per response on premium models, with Chatbase auto-recharge now costing $40 per 1,000 credits and Dante charging 25 credits for a single Claude Opus reply. Prices range from $19/month (Boei Starter) to $500+/month at scale.

Prices last verified against live vendor pricing pages on 2026-07-19. AI chatbot pricing changes often, especially on credit-based platforms; expect the numbers below to drift within a few months.

How Much Does an AI Chatbot Cost Per Message?

For most small businesses, an AI chatbot costs between $0.01 and $0.10 per response on entry-level paid plans, depending on the platform and which AI model powers the reply. Boei is at the low end at $0.0095 per response with flat pricing (any model, same price). Credit-based platforms like Chatbase, Dante AI, and FastBots start similarly cheap on budget models but jump to $0.05-$0.50 per response once you switch to premium models like GPT-5 or Claude Opus, because each response consumes more credits. The normalized comparison tables further down show the actual per-response cost on each platform across budget, mid-tier, premium, and top-tier AI models.

Training data limits tell you how much your AI chatbot can learn. But the other half of the equation, and often the bigger cost driver, is how many responses your chatbot can actually give. Every platform handles this differently, and the differences can mean paying 10x more per customer conversation depending on which AI model you use.

I spent a few hours going through the pricing pages, documentation, and support chatbots of 8 leading AI chatbot platforms to figure out what each response actually costs. For Boei's straightforward pricing, see the AI chatbot pricing page. The platforms I reviewed: Boei, Chatbase, Dante AI, FastBots, SiteGPT, CustomGPT, ChatNode, and Wonderchat.

For each platform, I dug into their credit systems, checked the multipliers for different AI models, calculated cost per response at different tiers. Tested their own chatbots to confirm details that weren't clear from the pricing pages alone. Here's what I found.

Three Pricing Models for Chatbot Responses

AI chatbot platforms use three fundamentally different approaches to limit and charge for chatbot responses.

1. Flat messages (1 response = 1 message, regardless of model)

The simplest approach. Every chatbot response counts as exactly one message, no matter which AI model generates it. You know exactly how many customer conversations you can handle.

Platforms using this model: Boei, SiteGPT

2. Credit-based with model multipliers

Each response consumes a variable number of credits depending on the AI model used. A response from a budget model might cost 1 credit. The same response from a premium model could cost 5, 20, or even 330 credits. Your advertised credit count can be misleading because it depends entirely on which model you run.

Platforms using this model: Chatbase, Dante AI, FastBots

3. Unlimited responses

Some platforms advertise unlimited messages, removing response limits entirely. The trade-off is usually a higher base price or limits elsewhere (like fewer chatbots or less training data).

Platforms using this model: Dante AI (Enterprise only), CustomGPT (within query limits)

The Credit Multiplier Problem

The credit-based model creates a significant transparency issue. When Chatbase advertises "2,000 message credits" on their Hobby plan, most people assume that means 2,000 customer conversations. The reality depends heavily on which AI model powers those responses.

Chatbase Credit Costs Per Response

Chatbase's Hobby plan ($32/mo) includes just 500 message credits, cut sharply from the 2,000 credits they used to offer at this tier. Here is what that translates to in real responses:

The Hobby plan gives you 500 responses on the cheapest models and just 83 responses on Claude Opus. That is a 6x difference in value from the same plan. Chatbase's multipliers themselves are moderate, but the 500-credit floor makes cost-per-response worse than every other platform in this comparison at the entry tier. Extra credits and auto-recharge now cost $40 per 1,000 credits, roughly triple what Chatbase charged in early 2026. If you enable auto-recharge (which most businesses need to avoid their chatbot going silent), those overage costs can double your bill in a busy month.

Dante AI Credit Costs Per Response

Dante AI restructured heavily in 2026. The Starter plan is now $40/mo and includes 2,000 credits (down from $29/3,000 credits earlier in the year). The multiplier system was simplified from a 12-tier range to six tiers, and the extreme 330-credit tier for Claude Opus is gone:

Dante used to charge 330 credits for a single Claude Opus response, which meant your $29 Starter plan gave you only 9 Opus replies for the entire month. That tier is retired: Opus is now 25 credits, so you get 80 responses on the $40 Starter. Better than before, still expensive. Extra credits cost $20 per 1,000 through the dashboard.

FastBots Credit Costs Per Response

FastBots keeps their multiplier system simple. Their Essential plan is now $33/mo (down from $39) and includes 2,000 messages. In 2026 they added a Claude Sonnet tier at 10 credits, so the multiplier range widened from 5x to 10x:

FastBots is still more straightforward than Dante AI: three tiers instead of six. Budget models cost 1 credit, most frontier models cost 5, Claude Sonnet costs 10. Your 2,000 messages drop to 400 on GPT-5 or 200 on Claude Sonnet. FastBots also added new tiers in 2026 (a $75/mo plan with 5,000 credits and a $333/mo plan with 30,000 credits) alongside the existing $165 Premium plan (down from $199).

Platforms With Flat Message Pricing

SiteGPT

SiteGPT offers two model choices (GPT-4.1 and GPT-4.1 Mini) and counts messages, not credits. Their Starter plan ($39/mo) includes 4,000 messages per month. GPT-4.1 Mini gives roughly 10x more messages per dollar than GPT-4.1 through SiteGPT's calculator, but there is no complex credit system to navigate. Extra messages cost $39 per 5,000 messages.

Boei

Boei uses the simplest model of all: each chatbot gets 2,000 AI replies per month, regardless of which AI model generates the response. GPT-5, Claude Opus 4.7, Gemini Pro, all count as one message. No multipliers, no credit tiers, no auto-recharge surprises. The Starter plan is $19/mo billed annually ($25 monthly) and includes 2,000 AI credits with email, WhatsApp, and SMS automation built in. Additional chatbots cost $6/mo (annual) each, also with 2,000 AI replies included. If you need more responses, you simply add another chatbot or upgrade to Growth ($49/mo annual, 7,000 credits) or Business ($129/mo annual, 20,000 credits).

Normalized Cost Per Response Comparison

This is where it gets interesting. The table below shows the actual cost per response on each platform's entry-level paid plan, calculated for both a budget model and a premium model.

Using a Budget Model (GPT-4o Mini or equivalent)

Boei is now the value leader even on budget models, tied with SiteGPT within a rounding error. Chatbase's 2026 cut to 500 credits on the Hobby plan pushes its cost per response to over $0.06, the worst in this comparison. Dante AI used to be the runaway budget-model winner earlier in 2026 (nano models cost 0.15 credits), but the current 1-credit floor moves it into the middle of the pack.

Using a Mid-Tier Model (GPT-4.1 Mini or 4o Mini equivalent, 1-2 credit tier)

Boei stays flat because switching model does not change the price. Every credit-based platform loses ground here compared to their budget-model rows, because their entry plans do not include enough headroom for even mid-tier usage.

Using a Premium Model (GPT-5 or GPT-4o tier)

This is where credit-based pricing really hurts. On GPT-5, Dante AI reaches $0.20 per response, Chatbase $0.13, FastBots $0.08. Boei's $0.0095 is 8x cheaper than FastBots, 13x cheaper than Chatbase, 21x cheaper than Dante at this tier. And Boei's price does not change when you switch to Claude Sonnet or GPT-5.4, whereas Dante charges 15 credits for Sonnet and Chatbase charges 3.

The Extreme Case: Top-Tier Models (Claude Opus)

For businesses that want to use the most capable model available (Claude Opus 4.5 or 4.6), credit-based platforms remain the most expensive option even after Dante's 2026 restructure. Dante retired its old 330-credit Opus tier during 2026, so a Claude Opus response no longer eats your entire monthly budget in a handful of replies. But at 25 credits per response, Opus on Dante Starter still costs 50x more per response than any answer on Boei.

FastBots does not currently expose Claude Opus at all on the Essential tier, so its top-tier row uses Claude Sonnet 4.5 for reference. Boei is the only entry-plan option in this comparison that gives you Claude Opus at flat pricing: your 2,000 monthly messages work identically whether the AI model is a $0.15/million-token Nano or a $75/million-token Opus.

The Hidden Cost: Overage Pricing

Running out of credits mid-month is where costs can really spike.

Chatbase now charges $40 per 1,000 extra credits, up sharply from the $12-14 range earlier in 2026. With auto-recharge enabled (which most businesses need to avoid their chatbot going silent), this adds up fast. On Claude Opus, 1,000 auto-recharge credits at $40 gives you around 170 responses, which works out to $0.24 per response on top of whatever you are already paying for your plan.

FastBots sells extra message add-ons through their pricing page. Predictable per-block cost, but the total climbs quickly at premium-model multipliers.

Dante AI charges $20 per 1,000 credits through the dashboard for extra credit top-ups. Predictable, but on Claude Opus at 25 credits per response, $20 buys you 40 extra Opus replies.

Boei does not charge overage. Ever. If you need more responses, you add another chatbot at $6/mo (with 2,000 additional responses), or upgrade to Growth ($49/mo annual) for 7,000 AI credits. There is no auto-recharge, no per-1,000-credit surprise bill, no model multiplier to worry about. Scaling costs are completely predictable, which matters when your chatbot volume spikes during a launch or seasonal peak.

SiteGPT charges $39 per extra 5,000 messages, which is a clean and predictable overage model.

What "Unlimited" Actually Means

Some platforms advertise unlimited messages, but this deserves scrutiny.

Dante AI only offers truly unlimited responses on their Enterprise plan (custom pricing, typically $1,000+/mo). Their standard plans (Starter $40, Advanced $120, Pro $400) all have credit limits.

CustomGPT includes query allowances within their plans, but reaching higher limits requires jumping from $99/mo to $499/mo.

In practice, no platform at the $19-100/mo range offers genuinely unlimited AI responses. They all have limits, just expressed differently.

Practical Scenarios

Small Business: ~500 customer conversations per month

A small business website with moderate traffic, getting about 500 chatbot conversations monthly. Average conversation length: 3-4 exchanges (so roughly 500 responses per month if counting single responses, or 1,500-2,000 if counting full conversation threads).

At 500 responses/month using a mid-tier model:

• Boei ($19/mo Starter): Comfortably within the 2,000 limit. Cost: $19/mo
• SiteGPT ($39/mo): Well within 4,000 limit. Cost: $39/mo
• FastBots ($33/mo): Within 2,000 limit at 1x. Cost: $33/mo
• Dante AI ($40/mo): 500 x 2 = 1,000 credits at Mini rates. Within 2,000 limit. Cost: $40/mo
• Chatbase ($32/mo): 500 responses at 1 credit each hits the Hobby plan's 500-credit ceiling exactly. Any spike triggers auto-recharge at $40/1,000 credits. Cost: $32/mo baseline, unpredictable in practice.

Boei is the cheapest at $19/mo. Chatbase, once middle-of-pack for this size of business, is now the riskiest option at this volume because the 500-credit ceiling leaves zero headroom.

Growing Business: ~2,000 conversations per month

A growing e-commerce store or SaaS product with 2,000 chatbot responses monthly using a premium model (GPT-5 tier):

• Boei ($19/mo Starter): Exactly at the 2,000 limit. Add one extra chatbot for safety: $25/mo total
• SiteGPT ($39/mo): Within 4,000 limit. Cost: $39/mo
• Dante AI ($40/mo): 2,000 x 10 credits = 20,000 credits needed. Starter has 2,000. Would need Pro plan at $400/mo (30,000 credits) or Advanced at $120/mo (8,000, still not enough)
• FastBots ($33/mo): 2,000 x 5 = 10,000 credits needed. Essential has 2,000. Would need Premium plan at $165/mo (10,000 credits)
• Chatbase ($32/mo): 2,000 x 2 = 4,000 credits needed. Hobby has 500. Would need Standard plan at $120/mo (4,000 credits)

At premium-model volume, the credit multiplier forces upgrades to much more expensive plans. Boei and SiteGPT stay on their entry plans because they do not penalize model choice. Boei at $25/mo versus Dante AI at $400/mo for the same 2,000 GPT-5 responses is a 16x difference on the same workload.

High-Volume: ~5,000 conversations per month

A busy support operation handling 5,000 responses monthly on a premium model:

• Boei: Growth plan ($49/mo annual) for 7,000 AI credits, or Starter + extras ($19 + $6 + $6 = $31/mo) for 6,000 responses
• SiteGPT: Growth plan at $79/mo for 10,000 messages
• FastBots: 5,000 x 5 = 25,000 credits. Premium at $165/mo covers 10,000; needs the higher $333/mo tier (30,000 credits) or extras
• Chatbase: 5,000 x 2 = 10,000 credits. Would need Standard ($120/mo, 4,000) plus significant auto-recharge, or Pro ($400/mo, 15,000)
• Dante AI: 5,000 x 10 = 50,000 credits. Would need Pro plan at $400/mo (30,000) plus $400 in overage credits

At high volume with premium models, the spread becomes enormous. Boei at $31-49/mo versus Dante AI or Chatbase Pro at $400/mo for the same 5,000 responses is roughly a 10x difference on identical output.

The Model Quality Trade-Off

Credit-based platforms create a real dilemma: you can use a cheap model to maximize your response count, but your customers get lower-quality answers. Or you can use a premium model for better answers but burn through your credits in days.

This trade-off does not exist on flat-pricing platforms. On Boei, switching from a budget model to a premium model does not cost you anything extra. Your 2,000 responses stay the same. This means you can always choose the best model for your use case without worrying about credit consumption.

The question to ask yourself: will you actually use a budget model in production? If your chatbot handles customer support, sales inquiries, or any high-stakes conversation, you probably want the best model you can get. And if you are going to use a premium model anyway, flat pricing platforms offer dramatically better value.

Key Findings

1. Credit-based pricing is inherently unpredictable, and the disparities widened in 2026. All three credit-based platforms in this comparison (Chatbase, Dante AI, FastBots) raised Claude Sonnet multipliers between 2x and 3x during 2026. The same plan can give you anywhere from 80 to 2,000 responses depending on model choice.

2. Boei offers the lowest cost per response at $0.0095 on the Starter plan. It stays flat regardless of model. No other platform at this price point matches this combination of low cost and model flexibility. On Claude Opus, Boei is 50x cheaper per response than the next-closest credit-based option.

3. Chatbase cut its Hobby credit allowance from 2,000 to 500 in 2026 and tripled auto-recharge to $40 per 1,000 credits. The Hobby plan is no longer competitive on cost-per-response: 500 credits at 1 per response means the plan runs dry inside 500 replies, and the overage burn is severe.

4. Dante AI retired its 330-credit Opus tier, but its overall pricing moved up. Starter went from $29 to $40, credit allowance dropped from 3,000 to 2,000, and premium-model multipliers roughly doubled. Better on Opus, worse everywhere else.

5. FastBots kept the cleanest credit system and dropped Essential from $39 to $33, but added a 10-credit tier for Claude Sonnet that puts Sonnet at $0.165 per response on the entry plan.

6. SiteGPT offers strong value with simple pricing at $39 Starter and $79 Growth. Prices held steady through 2026.

7. Overage charges can make any platform expensive. Chatbase's auto-recharge at $40/1,000 credits and Dante's $20/1,000 credits add up quickly during busy months. Boei has no overage: add a chatbot at $6/mo for 2,000 more responses, or upgrade to Growth ($49/mo annual) or Business ($129/mo annual) to keep scaling predictable.

8. Always calculate cost per actual response, not cost per credit. A plan with "8,000 credits" could mean 8,000 responses or 320 responses depending on the model. The credit number on the pricing page is almost meaningless without knowing which model you will use.

How to Compare Platforms Yourself

When evaluating any AI chatbot platform's message pricing, ask these questions:

1. How many credits or messages does the plan include?
2. Which AI model will I actually use in production?
3. How many credits does that specific model consume per response?
4. What is the real cost per response (plan price / actual responses)?
5. What happens when I run out? What do overages cost?
6. Can I switch models without changing my budget?

Run these numbers with the model you plan to use, not the cheapest model the platform offers. That gives you the true cost comparison. For the other side of the equation, see our companion article on AI chatbot training data limits compared. And if you want to understand the broader value of adding a chatbot, read about AI chatbot benefits.

FAQ

What is a message credit in AI chatbot pricing?

A message credit is a unit that platforms use to measure chatbot responses. On some platforms, one credit equals one response. On others, a single response can consume 1 to 330 credits depending on which AI model generates it. Always check the credit multiplier for the model you plan to use.

Why does the AI model affect the price per response?

Different AI models have different costs to run. Budget models like GPT-4o Mini are cheap to operate, while premium models like Claude Opus cost much more. Credit-based platforms pass this cost difference to you through multipliers. Flat-pricing platforms like Boei absorb it.

How many AI chatbot responses does a small business need per month?

Most small business websites need 300-1,000 responses per month. A mid-size e-commerce store or SaaS product might need 2,000-5,000. Start with an entry-level plan and track your actual usage for the first month before upgrading.

What happens when I run out of message credits?

It depends on the platform. Some stop your chatbot from responding until the next billing cycle. Others auto-charge for extra credits, and those auto-charges have climbed in 2026: Chatbase auto-recharge is now $40 per 1,000 credits, up from $14 earlier in the year. Boei lets you add another chatbot at $6/month for 2,000 more responses, or upgrade to a higher tier (Starter $19/mo, Growth $49/mo, Business $129/mo, annual billing), keeping costs predictable with no auto-recharge surprises.