How much does an AI chatbot cost per month?
Monthly cost of a customer-support chatbot on GPT, Claude and Gemini, calculated from live API prices.
Estimated monthly cost — Support chatbot
Calculated live from current TokenRex prices.
| Model | Input / 1M | Output / 1M | Per month |
|---|---|---|---|
| GPT-6 Luna | $0.10 | $0.50 | $7.00 |
| Claude Haiku 4.5 | $1.00 | $5.00 | $70.00 |
| Gemini 3.8 Flash | $0.75 | $3.75 | $52.50 |
| Gemini 3.1 Flash Lite | $0.25 | $1.50 | $19.50 |
| Claude Sonnet 5 | $2.00 | $10.00 | $140.00 |
| GPT-6 Astra | $10.00 | $50.00 | $700.00 |
The workload we priced
20,000 requests a month, each with about 1,500 input tokens and 400 output tokens. One token is roughly three quarters of an English word.
What drives the bill
Each reply resends the conversation so far, so long chats grow input cost.
Caching the fixed system prompt and knowledge base can cut repeated input cost on supported models.
Questions
- Are these exact monthly bills?
- They are estimates from live TokenRex prices and the token counts shown. Real bills depend on your actual prompt and reply lengths, which every API response reports in its usage field.
- How do I lower the cost?
- Shorten system prompts, cap reply length, cache repeated input where the model supports it, and send simple requests to a smaller model.
- Which currency am I billed in?
- Wallet top-ups and billing are in Indian rupees. Prices display in US dollars by default, and signed-in users can choose another display currency.
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