September 30, 2026
More time to test Space Bunny Alpha: stealth period extended to Oct 5
The free model on OpenRouter received speed and stability improvements, according to the service's Sep 30 update.
OpenRouter
@openrouter
Space Bunny Alpha update: The provider has improved the model's speed and stability, and the stealth period has now been extended until Oct 5. Try it again and let us know how it performs: https://openrouter.ai/stealth/space-bunny-alpha Thanks for continuing to share your feedback!
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Space Bunny Alpha will remain in stealth until Oct 5: OpenRouter extended the period following changes by the provider.
Free access. As of Sep 23, OpenRouter offered the model at $0 for input and output tokens. The provider has now improved its speed and stability. The model is also available on Siora's free plan: select Space Bunny Alpha in the model menu.
To call it via the API, send a POST request to `https://openrouter.ai/api/v1/chat/completions` with the field `"model": "stealth/space-bunny-alpha"`. Siora described this connection method on Sep 23.
Context and responses. According to OpenRouter's Sep 23 data, the model supports a context window of 1 million tokens and outputs up to 524,288 tokens per response. It accepts text alongside images or video and returns text.
The model supports tool calls through `tools` and controls tool selection through `tool_choice`. The `response_format` parameter requests a JSON response but does not enforce JSON Schema compliance.
According to the Sep 23 API snapshot, the model always uses reasoning. The default is `medium`, with five levels available:
- `low` - `medium` - `high` - `xhigh` - `max`
Space Bunny Alpha's stealth period now ends on Oct 5.
