OsirisBrain is a single frontier reasoning model sold through an OpenAI-compatible API. Developers change their base URL, use an sk-osiris API key and call the usual chat completions endpoint, with the same tool calls and streaming. There is one model and no choosing between providers, so the model is picked for you. Billing is prepaid and charged per real token, with no subscription or minimum. Starter balance costs $5 and Pro costs $20, while an Enterprise tier offers custom billing, dedicated rate limits and round-the-clock support. A welcome balance is given on sign-up, and the interface itself is written in Spanish.
Developers who already use OpenAI-style clients are the core audience, particularly those running coding agents such as opencode, Codex or Cursor who want to swap in a different model without rewriting code. Indie hackers and small teams benefit from pay-as-you-go billing, since there is no commitment. Engineering leads who are tired of juggling providers, keys and models get a single endpoint. Larger companies with volume needs can ask for the Enterprise arrangement with dedicated limits and support. Basic API familiarity is enough, because setup is two environment variables.
The quick start has three steps: create an account, get an API key, and point your client at the endpoint. From there, teams can call it from curl, wire it into a coding agent, or drop it into an existing application that already speaks the chat completions format. A coder model name appears in the example request, used to ask for a quicksort implementation. Tool-calling support lets agents run functions and chain steps. The usage dashboard shows consumption and balance in real time, so cost stays visible, and balance never expires, which suits sporadic projects and prototypes.
