What Is Space Bunny Alpha?

What does “stealth” mean here?

OpenRouter labels Space Bunny Alpha as a stealth model: a third-party provider operates it but has chosen to remain anonymous during the preview. OpenRouter routes requests; it is not the developer or owner of the model. The word “Alpha” belongs to the model's public name. It does not reveal a company, a model family, or a promised final release.

That distinction matters when evaluating claims online. Speculation that the model is an unreleased version of another company's system is speculation, not a provider announcement. A capable answer to one prompt cannot establish the developer's identity. We will update this explanation if an identifiable primary source publishes a reveal.

When did it appear, and why is access free?

OpenRouter lists September 23, 2026 as the release date. As checked on October 3, its model page labels the input and output price as free and displays “Going away October 5, 2026.” Treat that as the upstream listing's current schedule, not a guarantee that access will remain available until that hour or continue afterward.

A free preview lets people try a model before its provider is publicly named. The provider has not published a reason for its pricing, so claims about a marketing experiment, benchmark campaign, or future paid tier would be guesses. SpaceBunny.dev adds its own daily fairness limit and does not promise permanent free access.

What can the model do?

The OpenRouter listing describes strong coding capabilities, multimodal input, and adjustable reasoning effort. In practical terms, you can discuss a programming problem, ask it to inspect an image, or ask what happens in a short video. The published input types are text, images, and video; the output is text. Tool calling and JSON object output are listed, but JSON Schema enforcement is not promised.

The model listing describes a very large context window. That is a model-level specification, not the capacity of every third-party interface. This site's preview deliberately has smaller message, attachment, history, and output limits. Read the limits before uploading a long file, and split complex work into focused questions.

• Coding: ask for a diagnosis, an explanation, or a small change you can test yourself.
• Reasoning: choose an effort level and ask the model to examine assumptions or alternatives.
• Multimodal input: provide an image or MP4 video and ask a precise question about what it shows.

How is it different from a named, generally available model?

With a named model, you can usually examine the publisher's product documentation, release history, and long-term support policy. For Space Bunny Alpha, the provider has not disclosed its identity during the preview and the availability window is short. That makes independent verification especially important. Do not infer a benchmark rank, training method, or hidden model size from the name or a few social-media examples.

This workspace is independent of both the anonymous provider and OpenRouter. It requires sign-in to protect a shared free allowance, stores your conversation under your account, and sends requests via OpenRouter. The upstream model provider may retain prompts and completions under its stealth-model terms. Avoid sensitive material and check important outputs against primary sources.