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What will an AI assistant cost to run each month?
Real per-token prices from Anthropic, OpenAI and Google, applied to your conversations: the monthly bill, the cost of one conversation, and what changes it most.
Your sector
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Every month the assistant has conversations of about messages each. The messages are , in , and the answers draw on . Prompt caching is .
Typical volumes
The full report by email
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- What we would do first
- A link to book a call about it
How we count
- 1Each message the assistant answers sends the model its instructions (1 500 tokens), any document excerpts (none, 3 000 or 12 000 tokens), the conversation so far and the new message; the model then writes its reply. Long conversations cost more per message, because the history is sent again every time.
- 2Words become tokens at about 2 tokens a word in Lithuanian and 1,35 in English (our measurement, rounded). Anthropic states its newer models (Claude 4.7 and later) use about 30 % more tokens for the same text, so we add that for Sonnet 5.5 and Opus 5.5.
- 3With prompt caching, the instructions and the history are billed at the cached-input price; each new exchange is written to the cache (Anthropic and OpenAI charge 1,25 × the input price for that; Google does not). Document excerpts change with each question and are billed in full.
- 4Prices are each provider's public list price per million tokens, standard tier, checked on 7 October 2026, converted at the ECB reference rate of 1 EUR = 1,1269 USD. Batch processing (50 % off) is not counted: it does not fit live conversations.
- 5Not included: hosting, monitoring and your own staff's time. Gemini 3.8 Flash is at a promotional price until the end of 2026; Gemini 3.1 Pro is still a preview model.
Sources
- Anthropic: “Claude API pricing”Checked 7 October 2026
- OpenAI: “API pricing”Checked 7 October 2026
- Google: “Gemini Developer API pricing”Checked 7 October 2026
- European Central Bank: “Euro foreign exchange reference rates: 1 EUR = 1,1269 USD”6 October 2026
See it working
A beauty salon that takes bookings at night tooThe AI assistant books visits after hours and hands what a person must decide to the front desk.Open the demo
Would you let it press Send?The danger is the write, not the thought: a missing send function and a check on the real files stop what a rule in its memory could not.Open the demo
Orders from emails that nobody retypes by handThe order, stock reservation and delivery route build themselves from the email; a person decides only the line the assistant is unsure of.Open the demo
How we build this
We build systems like this to fit your work, connected to the tools you already use.
Want to put this in place?
A free 30-minute call: we pick the model and the set-up for your assistant, with its running cost measured on your own questions.