Space Bunny Alpha —1M context, free, fast.
POST spacebunnymodel.com/api/v1/chat/completions
Write codeReason step by stepExplain simplyExtract JSON
system prompt (optional)
your message129c
▶Run Space Bunnyreal API · free · no signup · streamed
Space Bunny's answer streams in here. Pick a preset, edit the prompt, and hit Run Space Bunny.
Why Space Bunny
What makes it worth trying
A stealth preview model with frontier-scale context, served fast — and free while it lasts.
1,000,000-token context
Drop a whole repo, a long transcript, or a book into a single call. 1M tokens in, up to 524k out — no chunking gymnastics.
Free during preview
Space Bunny Alpha is free right now. Try it in the browser with zero signup, or point your code at our hosted endpoint.
Reasoning + multimodal
Adjustable reasoning effort, native text-vision-audio-video input, strong coding, and blazing-fast inference.
The 1M advantage
A context window that holds the whole thing
Most models cap out long before a real codebase or document fits. Space Bunny Alpha takes 1,000,000 tokens in a single call — and returns up to 524,288.
Typical model128K
Extended context200K
Space Bunny Alpha1M
≈ 750,000 wordsa whole repo in one callhours of transcriptsfull docs + code
Four ways to use it
Pick your path to Space Bunny
Free in the browser, a drop-in hosted API, straight from OpenRouter, or as a 1M-context tool inside your agent — your call.
opencodeUse it in opencodeThe fastest way to code with Space Bunny for free. Point opencode at our OpenAI-compatible endpoint and go.opencode setup →APIOur hosted APIOne OpenAI-compatible key, no OpenRouter account, no rate-limit surprises. Drop it into any SDK, CLI or agent.Get an API key →OpenRouterStraight from OpenRouterPrefer the source? Call stealth/space-bunny-alpha directly. We show you exactly how, plus the caveats.How to call it →MCPAdd it to your agentGive Claude Code, Cursor or opencode a 1M-context tool via MCP — offload whole-repo analysis to Space Bunny.Install the tool →
1M
Input context window
524k
Max output tokens
Free
During preview
4
Input modalities
FAQ
Space Bunny, answered
What is Space Bunny Alpha?
Space Bunny Alpha is an anonymous ('stealth') large language model available on OpenRouter since September 2026. It has a 1M-token context window, native multimodal input, adjustable reasoning, and strong coding — served fast and, during the preview, for free.
Who made Space Bunny?
The provider is anonymous during the preview. Community reverse-engineering of its tokenizer and behavior points to MiniMax M3, but the identity is unconfirmed. OpenRouter only routes requests to it.
Is Space Bunny free?
Yes — it's free during the OpenRouter preview. Our browser playground is free with no signup. Our hosted API has a free tier plus paid plans for higher limits and reliability when the model graduates to paid.
How do I use Space Bunny in opencode?
Point opencode's OpenAI-compatible provider at our endpoint (or OpenRouter) and select space-bunny-alpha. Full step-by-step on our opencode integration page.
How big is the context window?
1,000,000 input tokens and up to 524,288 output tokens — one of the largest available, ideal for whole-codebase and long-document tasks.
Try Space Bunny Alpha now
Free, no signup, streamed from the real API. Then grab a key to use it anywhere.
Space Bunny Alpha — free 1M-context LLM playground & API