Pricing
Lucy is a frontier-level AI system powered by Bittensor, billed per token on what you actually use: no subscriptions, no seat minimums. The OpenAI-compatible API meters every call in real time.
Updated
New accounts start with $5 of free credit. No payment setup needed.
How much does Lucy cost?
Chatting with Lucy is free. Website and app builds, AI inside your apps, and the API are charged per token at these rates.
Price per million tokens
| Model | Input | Cached input | Output |
|---|---|---|---|
| Lucy | $0.40 | $0.12 | $1.95 |
Prices are per million tokens, charged on the tokens Lucy reports for each call. For comparison, Moonshot AI publishes Kimi K3 at $3.00 input, $0.30 cached input and $15.00 output per million tokens (platform.kimi.ai/docs/pricing/chat, checked October 14, 2026): Lucy's input and output prices are each under one seventh of that.
Is Lucy right for you?
A good fit if you want to pay only for what you use, with no monthly fee.
Less of a fit if you need a fixed monthly bill: your cost depends on how many tokens you send and receive.
How does billing work?
Every non-streaming /v1/chat/completions response carries the tokens it was billed on, and the charge for that call is in a response header — see the API reference. For a streaming response, add stream_options: {"include_usage": true} to receive the billed tokens in a final chunk. Cached input is whatever the model reports as reused from a prior turn; everything else is billed at the input rate.
A new account starts with $5 of free credit so you can make your first calls right away. After that, add credit from your account page.
Questions about billing
- Is there a monthly fee?
- No. You pay only for the tokens you send and receive.
- Does Lucy charge for failed requests?
- No. A request that errors before Lucy returns usage is not charged.
- What happens if a stream is cut off early?
- You're billed for the tokens actually generated before the cut-off, not a flat rate.