Kolibri-1: Aleph Alpha's open reasoning model under Apache 2.0

Aleph Alpha released Kolibri-1 on October 3, 2026, a reasoning model for German and English under the Apache 2.0 licence. It is a mixture-of-experts model with 78B total parameters and 3.46B active per token. The context window reaches 1,048,576 tokens, with a recommended maximum of 262,144. The FP8 weights take about 78 GB; it needs at least 1 H200 or 2 A100 80 GB. It runs with the aleph-alpha-inference package, a vLLM plugin. According to the company, it matches models with up to four times as many active parameters. Greek is not mentioned.