FULL STORY

Space Bunny: The Anonymous Stealth Model That Topped the Charts

A deliberately anonymous stealth model, Space Bunny Alpha, quietly appeared on OpenRouter and OpenCode in late September. Free access sparked a wave of community testing, and the model soon topped usage rankings while its creator remained unknown.

2026-09-24 ~ 2026-09-29 · 4 episodes · 26 posts

Episode 1 · Mystery Stealth Model "Space Bunny" Goes Free Across Platforms, Sparking Community Tests (2026-09-24, 6 posts)

Starting September 24, an unidentified stealth model dubbed "Space Bunny" (shown as Space Bunny Alpha / Stealth Bunny Alpha on some platforms) was made temporarily free across multiple platforms, triggering intense community testing and speculation. Its true identity remains officially unconfirmed, but the rare combination of free access, a 1M-token context, and multimodal capabilities has drawn many developers.

Confirmed

  • opencode announced the model free for one week, highlighting a 1M context window, multimodality, and Zero Data Retention.
  • Cline officially launched the model (as Stealth Bunny Alpha) for free, citing fast reasoning, strong coding, multimodal input, and a 1M-token context.
  • The model is live on OpenRouter (as Space Bunny Alpha) with adjustable reasoning, text/image/video input, and free access via Nous Portal.
  • Command Code offers the same model free on all paid plans, featuring a 1M-token context and multimodality.
  • User omarsar0 tested vision tasks and observed self-verification behavior: with a browser, it opened pages, took screenshots, fixed issues, then declared completion; he also generated a playable 3D game from a hand-drawn sketch.
  • User iamfakhrealam generated a complete game, "Space Hop"—a bunny hopping across neon space rocks collecting carrots—at 60fps with particle trails and a glass-style menu from a single prompt.

Unconfirmed

  • Developer saheedniyi02 speculated the model might be Kimi; this remains personal conjecture with no official confirmation of the model's identity.

Why it matters

  • A free stealth model offering 1M tokens of context, multimodal input, and zero data retention is rare and explains the wave of developer testing.
  • The single-prompt 60fps playable game and self-verification cases showcase the model's ceiling in coding and visual generation, fueling community discussion.

Episode 2 · Stealth Model "Space Bunny Alpha" on OpenRouter Suspected to Be MiniMax M3.1 (2026-09-24, 8 posts)

On September 23, an anonymous third party launched a stealth test model, "Space Bunny Alpha," on OpenRouter and OpenCode, free to use and positioning itself as an extremely fast flash-level reasoning model. Because it identified itself as a MiniMax model when asked in Chinese, the community widely speculated it is the upcoming MiniMax M3.1. The model was later temporarily taken offline, with OpenRouter citing provider-side issues and promising to restore it with an announcement once stable.

Confirmed

  • The model was provided by an anonymous third party, launched on OpenRouter on September 23 as a fast flash reasoning model with free access
  • It supports adjustable reasoning effort, a 1M token context window, and text, image, and video multimodal input, with official messaging emphasizing speed and strong coding capability
  • Reddit users found its chain-of-thought exhibits a typical "caveman mode" style—reasoning in ultra-terse expressions that save CoT tokens
  • A user tested it by building an immersive 3D e-commerce site, validating its coding ability
  • The model was temporarily taken offline; OpenRouter said the issue was on the provider's side and it would be restored and announced once stable

Unconfirmed

  • Whether the model is actually MiniMax M3.1 remains speculation, based mainly on its Chinese-language self-identification and community fingerprinting; leaker @koltregaskes noted it has not been fully tested

Why it matters

  • Stealth launches are a common way for vendors to stress-test new models before release; if Space Bunny Alpha is indeed MiniMax M3.1, it suggests MiniMax's next-generation model will focus on ultra-long context, multimodality, and cost-efficient reasoning
  • The "caveman mode" chain-of-thought demonstrates a technical route of reducing reasoning token costs by compressing CoT expressions—worth watching to see if it ships in the official release

Episode 3 · Mystery Stealth Model Space Bunny Alpha Hits OpenRouter Free for the Weekend (2026-09-26, 7 posts)

A deliberately anonymous stealth model, Space Bunny Alpha, appeared on OpenRouter and is completely free for the weekend, drawing community attention. Its specs are aggressive, multiple users have verified its real-world performance, and a hint from the rabbit team remains the only clue to its origins.

Confirmed

  • 1M token context window with native multimodal input spanning text, images and video
  • Adjustable reasoning effort and tool calling support
  • OpenRouter's official page positions it as an anonymous large model: extremely fast inference, strong coding, built by a third-party vendor that chose to stay anonymous
  • Available free via OpenRouter and OpenCode for the entire weekend
  • User @AlGrigor relayed that someone generated a complete stealth game themed around space bunnies in one shot within 10 minutes, then kept iterating on it
  • Developer @iamfakhrealam tested it: given only an ASCII wireframe as the full spec — an exact 250px sidebar, responsive grid, live charts simulating telemetry every 2 seconds — the model reproduced the pixel-level layout in one pass and wired up all state logic including side navigation
  • @SimonBalmain relayed the rabbit team's @rabbithmi statement: the model is codenamed space bunny (🐰) and is suspected to be linked to the upcoming rabbit OS3

Unconfirmed

  • The developer's identity remains fully anonymous; the rabbit team's statement is the only attribution clue and awaits further confirmation
  • Pricing after the free period and official release plans are unknown

Why it matters

  • Free access to an anonymous stealth model is rare on OpenRouter and typically signals anonymous load testing or a pre-launch warm-up; the rabbit team's hint offers a new lead toward "backed by rabbit, teasing OS3," though it remains unverified
  • The combination of 1M context, multimodal input and tool calling, plus verified rapid game generation and one-shot reproduction of a full UI from an ASCII wireframe, makes it worth trying this weekend

Episode 4 · Mystery Model SpaceBunny Tops OpenCode Charts for 5 Days, Identity Unknown (2026-09-27, 5 posts)

Around September 23, an anonymous model named SpaceBunny (Space Bunny Alpha, dubbed "太空兔" by Chinese communities) appeared on OpenRouter and OpenCode, offering free access with 1M-token context, multimodality, adjustable reasoning effort and fast inference, with no user data retention during its anonymous period. Within days it topped OpenRouter's daily leaderboard and held the #1 spot on OpenCode for 5 consecutive days, processing 40T tokens in total, sparking widespread speculation about its creator.

Confirmed

  • Launched on OpenCode on Sept 23, ranking second in invocation volume and peaking at #1; also topped OpenRouter's daily invocation chart
  • opencode officially stated Space Bunny has held the platform's top spot for 5 consecutive days, processing 40T tokens cumulatively
  • Free to use: 1M-token context, multimodal, adjustable reasoning effort, no user data retention during anonymity
  • No technical report, no vendor claim
  • Multiple media tests: 量子位 tested over ten coding tasks in DeepSeek Harness (including a Three.js 3D Temple of Heaven); 智东西 found its 3D and frontend capabilities stunning; WorldofAI ran coding and agent benchmarks comparing it against GPT-6 Astra; APPSO tested sketch-to-3D-webpage generation, stable long context and strong agent coding

Unconfirmed

  • The vendor behind the model remains unknown. APPSO suggests it may be MiniMax; 智东西 speculates it is a certain vendor's F-series model (post truncated); community guesses range from a major vendor's quiet test to a new model codename. None are officially confirmed

Why it matters

The anonymous, capability-first model topping charts without marketing, a technical report or vendor backing shows its coding, 3D and agent abilities have won real developer-community recognition at massive scale; the reveal of its identity could directly reshape the current model competition landscape.