Space Bunny: The Free Stealth Model Everyone Is Testing

Space Bunny Alpha appeared on OpenRouter on September 23, 2026 with a 1,000,000-token context window, video input, a $0 price tag and no name attached. Here is everything known so far.

Use Space Bunny Free → Who Made It?
Status: Unclaimed · Free Space Bunny Alpha is still unclaimed. No lab has officially named it. Last checked September 30, 2026.
1M
Context tokens
524K
Max output tokens
$0
Preview price
#3
OpenRouter weekly volume

What Is Space Bunny?

Space Bunny, listed in full as Space Bunny Alpha, is a stealth AI model: a large language model published without the name of the company that built it. It showed up in the OpenRouter catalog at 14:48 UTC on September 23, 2026 under the ID stealth/space-bunny-alpha, with the provider shown only as "Stealth" and the price set to zero. There was no launch post, no model card and no lab taking credit.

What Space Bunny did bring was an unusually large spec sheet. The listing promises a 1,000,000-token context window, up to 524,288 output tokens, native text, image and video input, tool calling, and reasoning that is always on with five effort levels. OpenRouter describes Space Bunny Alpha as "an anonymous large model with blazing-fast inference, strong coding capabilities and native multimodal input support."

Within days Space Bunny became one of the most used models on the platform. By the end of its first week it ranked third in OpenRouter's weekly call volume, behind only DeepSeek V4.1 Flash and GLM 5.3 Flash. OpenCode made Space Bunny free inside its coding agent, and Kilo Code, AI/ML API and several other gateways added it within days.

This site is an independent Space Bunny reference. We are not affiliated with OpenRouter, OpenCode, MiniMax or whoever built the model. Everything below is sourced and dated, because with a stealth model the gap between fact and rumor is the whole story.

Not the cartoon: If you searched for Space Jam, Bugs Bunny or Lola Bunny, you are in the wrong place. This Space Bunny is an AI model, and its name is a codename, not a reference to the film.

Space Bunny Alpha Specs at a Glance

Taken from the OpenRouter listing and its public model API, as of September 30, 2026. The anonymous provider supplies these figures, and no third party has verified them.

FieldSpace Bunny Alpha
OpenRouter model IDstealth/space-bunny-alpha
OpenCode model IDopencode/space-bunny-free
First listedSeptember 23, 2026, 14:48 UTC
Context window1,000,000 tokens
Max output524,288 tokens
InputText, image, video
OutputText (including code and JSON)
ReasoningAlways on; effort low / medium / high / xhigh / max
Toolstools, tool_choice, response_format (JSON), streaming
Price$0 input, $0 output during the preview
DeveloperUndisclosed (listed as "Stealth")

Two details on that list matter most in practice. First, Space Bunny reasoning cannot be switched off. You can set effort to low for quick replies, but even a greeting passes through a thinking step. Second, the 524K output ceiling is a limit, not a promise. Long-output quality usually degrades well before a nominal ceiling, and nobody has published a test that checks Space Bunny at that length.

Six Things Worth Knowing About Space Bunny

1. It is free, for now

Space Bunny costs $0 on OpenRouter and in OpenCode. OpenCode first announced a one-week free window starting September 23, and users on r/opencode report it has been extended to October 5. See the Space Bunny free guide for every $0 route.

2. Nobody has claimed it

OpenRouter says Space Bunny "is developed and operated by a third-party provider who has chosen to remain anonymous during this preview." OpenRouter routes the traffic but is not the developer.

3. The evidence points at MiniMax

Three independent tokenizer tests matched Space Bunny to the MiniMax tokenizer family on launch day. On September 27 MiniMax launched M3.1-Flash-Preview with the same 1M context, always-on thinking and low-to-max effort ladder. Our who made Space Bunny page grades every clue.

4. It is fast

OpenRouter's own dashboard showed Space Bunny at a median 79 tokens per second and 1.61 seconds latency in its first days, with 98.96 percent availability. Developers running a dozen parallel requests reported no obvious slowdown.

5. The quality reports are mixed

Some developers say Space Bunny found bugs other models missed and built 3D demos in one pass. Others say it left medium-sized tasks unfinished or drifted into Chinese mid-answer. Our Space Bunny Reddit roundup collects both sides.

6. Your data may be kept

The listing says prompts and completions may be retained by the provider but not used for training. That is a retention statement, not a zero-retention promise. Keep private code and credentials out of Space Bunny until the provider is known.

The Space Bunny Timeline

Most model launches come with a blog post and a benchmark chart. Space Bunny arrived as a new row in a database.

DateWhat happened
Sep 23, 14:48 UTCSpace Bunny Alpha appears on OpenRouter as a free stealth listing. OpenCode adds it as space-bunny-free and calls it free for a week.
Sep 23, same dayA user asks the model in Chinese who made it, and it answers MiniMax. Within hours, two separate tokenizer tests match the MiniMax family.
Sep 23–24A brief outage hits within hours of launch. Kilo Code, AI/ML API and other gateways add Space Bunny.
Sep 26Hands-on YouTube tests appear, from browser operating systems to Blender and Godot scenes built by Space Bunny.
Sep 27MiniMax announces M3.1-Flash-Preview in MiniMax Code with a matching spec sheet. Space Bunny ranks third in weekly OpenRouter volume.
Sep 29OpenCode users report the Space Bunny free period is extended to October 5. The model is still unclaimed.

Where You Can Use Space Bunny

Space Bunny is reachable in several places, and the model ID is slightly different on each one.

  • OpenRouter: stealth/space-bunny-alpha through the standard chat completions API. Setup is in our Space Bunny OpenRouter guide.
  • OpenCode Zen: opencode/space-bunny-free, pickable in the OpenCode model menu. See the Space Bunny OpenCode setup.
  • Kilo Code: listed as Space Bunny Alpha, free, with the full 1M context and 524K output.
  • Other gateways: AI/ML API lists Space Bunny free while it is cloaked, and NanoGPT and a few resellers offer paid routes at a few cents per million tokens.

Whichever route you choose, set the reasoning effort yourself. Low effort is best for quick edits and chat, and high or max suits multi-file refactors. Leaving Space Bunny on a high default for simple prompts wastes time on thinking you do not need.

What Space Bunny Is Good At

Based on the listing and on public testing so far, Space Bunny fits these jobs best:

  • Long-context code review. A 1M window can hold a mid-sized repository, so Space Bunny can answer questions across files without retrieval tricks.
  • Image-to-code. Screenshot in, working HTML or React out. Several testers called this Space Bunny's standout skill.
  • Creative front-end work. Interactive 3D scenes, SVG graphics, games and prototype websites came up again and again in demos.
  • Video understanding. Space Bunny accepts video input, which few free models do. You can use it to summarize screen recordings or bug reproductions.
  • Agent loops. Tool calling, JSON output and fast responses make Space Bunny a cheap engine for experimental agents.

It is a weaker fit for anything that needs a stable provider, a documented training policy or a guaranteed price next month. A stealth model is a preview, and Space Bunny could change name, price or behavior overnight.

Explore the Space Bunny Guide

Who Made It → MiniMax tokenizer matches, the M3.1 spec sheet and the counter-evidence. Free Access → Every $0 route, the rate limits and the October 5 deadline. Benchmark → GPQA, MMLU-Pro, speed and real coding tests. OpenRouter API → Model ID, curl and Python code, reasoning effort, video input. OpenCode Setup → Install, select space-bunny-free and tune effort in OpenCode. Reddit Opinions → Praise, complaints and theories from r/opencode and r/LocalLLaMA.

Space Bunny FAQ

What is Space Bunny?
Space Bunny (full name Space Bunny Alpha) is an anonymous stealth AI model that appeared on OpenRouter on September 23, 2026. It has a 1,000,000-token context window, accepts text, images and video, always reasons before answering, and is free during its preview. The developer has not been named.
Is Space Bunny free?
Yes. Space Bunny Alpha is listed at $0 per million input and output tokens on OpenRouter, and OpenCode offers it free as space-bunny-free. OpenCode users report the free period was extended to October 5, 2026. Past stealth models stopped being free once their maker was revealed.
Who made Space Bunny?
Officially, nobody knows. Three independent tokenizer tests matched Space Bunny to the MiniMax tokenizer family, and MiniMax launched M3.1-Flash-Preview with the same published specs on September 27. That makes MiniMax the leading theory, but it is not confirmed.
Is Space Bunny good for coding?
Space Bunny is marketed for strong coding and fast inference, and many developers report good results on web apps, 3D demos and bug hunting. Others report unfinished one-shot outputs, overthinking at high effort and occasional outages. Test it on your own tasks.
Can Space Bunny generate images or video?
No. Space Bunny reads images and video but only outputs text, which can include code, SVG markup or JSON. It is an understanding and reasoning model, not a media generator.
Is Space Bunny related to Space Jam or Lola Bunny?
No. Space Bunny Alpha is an AI language model. The name only resembles Space Jam and its character Lola Bunny. Stealth model names on OpenRouter are codenames and have never hinted at the real developer.
Is it safe to send private code to Space Bunny?
Be careful. OpenRouter says prompts and completions may be retained by the anonymous provider, though not used for training. Until the developer is known, treat Space Bunny like a public test bench and keep secrets, credentials and customer data out of it.

Keep reading

Who Made Space Bunny?

Tokenizer fingerprints, the MiniMax M3.1 spec match and the counter-evidence.

Benchmark Results

GPQA, MMLU-Pro, speed and hands-on coding tests from independent testers.

Stealth Model History

Every anonymous Alpha of 2026 and the lab that turned out to be behind it.