MxChat

Mistral API pricing on a real chatbot: Medium 3.5 cost $6.78 per 1,000 replies, Large 3 $2.08, Small 4 $0.61. Cache, reasoning and rate limits, tested. Mistral’s API price list has an odd shape this autumn. Mistral Medium 3.5 costs $1.50 per million input tokens and $7.50 per million output tokens. Mistral Large 3 costs $0.50 and $1.50. So the model called Medium is three times the price of the model called Large on input and five times on output. If you are choosing a Mistral model for a WordPress chatbot, the name tells you very little about the bill. We wanted numbers rather than a rate card, so on 5 October 2026 we sent the same three customer-support questions, with the same system prompt and the same retrieved help pages, to five Mistral models from our production WordPress server. This is what Mistral API pricing works out to on a real retrieval chatbot, per 1,000 replies, as billed.