LLM API cost by use case
What common AI features cost to run on each model, with the token assumptions behind every figure.
Customer support chatbot
A chat assistant on a help site that answers questions using a fixed policy prompt and the conversation so far.
- GPT-6 Luna · £18.25 a month
- Claude Haiku 5.5 · £18.25 a month
- GPT-6.1 Terra · £177.35 a month
- GPT-6.1 Sol · £354.71 a month
- Claude Sonnet 5.5 · £354.71 a month
- Claude Opus 5.5 · £709.41 a month
- Claude Fable 5.2 · £1,398 a month
- GPT-6 Astra · £1,825 a month