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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.

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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

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Anthropic
OpenAI
Google

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How we count

  1. 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.
  2. 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.
  3. 3With prompt caching, the instructions and the history are billed at the cached-input price; each new exchange is written to the cache (Anthropic charges 1,25 × the input price for that). Document excerpts change with each question and are billed in full.
  4. 4Prices are each provider's public list price per million tokens, standard tier, checked on 6 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.
  5. 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

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