Since I assume you may eventually add more capable, larger, and more expensive models, such as Kimi K3, it would be great to have an alternative option for occasional users.

Something similar to what OpenRouter and NanoGPT offer: a prepaid, usage-based credit system rather than a traditional fixed monthly subscription. Users could add funds to their account balance, and each model request would deduct credits based on the model used, token usage, and pricing.

Alongside this, it would also be nice to have more advanced generation settings, such as a custom system prompt, the option to use the base/vanilla model behavior where supported, adjustable reasoning effort, temperature controls, and similar parameters.

I think this would be especially useful for people who don't use Lumo frequently enough to justify a monthly subscription but would still like occasional access to more capable or expensive models.