Kolibri-1: Free AI Chat & OpenAI-Compatible API
Try Aleph Alpha’s open-weight language model in your browser. Ask questions in English or German, write an email, explore code, or explain a complex topic. No download, local GPU, or installation is needed.
Try Kolibri-1 free ↗Try Kolibri-1 online without signup
Start with 10 free messages per day without an account. This allowance is shared per IP address, so people on the same network share it. A free account provides 1,000 messages per day. Allowances reset at midnight UTC.
What can you ask Kolibri-1?
- Write a warm, concise email introducing a project to my team.
- Erkläre mir Quantencomputing mit einem einfachen Beispiel.
- Write a Python function that groups a list of events by hour.
For current information, the chat offers web search powered by Brave. You can turn it off in the composer. Check important claims against the sources: generated answers can be incorrect.
Kolibri-1 API: OpenAI-compatible access
Building a product or testing an agent? Tesseracted provides an OpenAI-compatible chat completions endpoint. Use the model name Aleph-Alpha/Kolibri-1 with the base URL https://api.tesseracted.com/v1. Streaming and non-streaming responses, tool calling, and configurable thinking are supported. Applications execute tool calls; Brave web search is not included in the model API.
API access requires approval. Email your use case and expected traffic to modelaccess@tesseracted.com. Approved pilot accounts can receive a seven-day trial with up to 100 million tokens per day, 20 concurrent requests, and 300 requests per minute. Your account’s approved quota and expiry apply; API access is separate from the free chat allowance.
An open-weight model by Aleph Alpha
Kolibri-1 is developed by Germany’s Aleph Alpha and published under the Apache 2.0 license. Tesseracted Labs GmbH runs this independent hosted playground. Model ownership remains with Aleph Alpha; this is not an official Aleph Alpha service.
Prompts are retained for 30 days to operate and improve the demo. Avoid sensitive information. Review the model’s license before using its weights in your own project.