AI Chatbot Pricing Calculator
Price a customer-support or assistant chatbot without burning margin on long conversations.
Chatbots are deceptive. The first message is cheap; by message 20 you're re-sending a 6,000-token conversation history on every reply. Calcaas lets you model average conversation length, model choice, and free-tier abuse so your unit economics survive contact with real users.
Common pricing models
Per-user subscription
Flat monthly fee, capped messages or tokens per user.
Credit / message bundles
Pre-paid credits that map to underlying token spend with a healthy multiplier.
Freemium with hard cap
Free tier limited by daily messages; paid tier unlocks the rest.
Cost components to model
LLM input tokens
Conversation history grows linearly — model the average, not the first turn.
LLM output tokens
Typically 2–5× the cost of input tokens; cap response length where you can.
System prompt tax
A 1,500-token system prompt sent on every turn adds up at scale.
Recommended models
| Provider | Model | Why |
|---|---|---|
| OpenAI | gpt-4o-mini | Default for most support bots — cheap, fast, good-enough quality. |
| Anthropic | claude-haiku-4-5 | Better instruction-following for structured replies. |
| gemini-2.5-flash | Cheapest at long context windows. |
Example scenario
Setup
$19/mo plan, 500 messages/user/month, 800 input + 200 output tokens/turn on GPT-4o-mini.
Watch out for
Conversation history doubles input tokens by message 10 — re-run the math at realistic turn counts.
Run the numbers for your ai chatbot product
Free tier covers everything on this page. Pro unlocks 30+ currencies and live FX.