No. Although many AI providers charge for model usage, there are a few ways to use OS3 without paying for it.

An API key itself is not something you pay for — it is just a credential. What can cost money is the model usage behind it, and that depends on the provider and model you choose. Some providers offer models you can use for free, within limits they set.

openrouter's free models

OpenRouter, one of the aggregator providers OS3 supports, offers a selection of free models. Which models are free changes over time, so check OpenRouter's current free models rather than relying on any specific list. Register your OpenRouter key in settings → api keys, then assign one of its free models to a tier the same way you would assign any other model.

google gemini's free tier

Google offers a free tier for the Gemini API, with its own usage limits. Create a key in Google AI Studio, register it under Google Gemini in settings → api keys, and assign a Gemini model that falls within the free tier. See Gemini API pricing for what is included at no cost.

running a model locally

OS3 also supports running a compatible model on a computer you have already connected with rabbit agent, instead of through a cloud provider. This avoids provider charges entirely, but needs hardware capable of running the model you choose. See how to bring your own key for how to register a Local LLM credential.

good to know

  • Free tiers, limits and available models are set by each provider, not by rabbit, and can change at any time.
  • Not every provider or model is free. Anthropic, OpenAI, Ollama and Z.ai models are generally paid, and some OpenRouter and Gemini models fall outside their free tiers.
  • Free access does not necessarily cover every OS3 feature or model — check the provider's own terms for what is included.

common questions

do I have to pay to use OS3 itself?

No. OS3 is free. Any cost comes from the model provider you choose, and the options above are ways to avoid that cost.

which providers can I use with OS3?

See how to bring your own key for the full list of supported providers.