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Large Language ModelsOpen-Source AITHE DECODERPublished: Oct 6, 2026, 01:00 JST

Aleph Alpha releases Kolibri, 78B open-weight model

Aleph Alpha releases Kolibri, 78B open-weight model

3 Key Points

  1. What happened

    Aleph Alpha released Kolibri, a German-English model with 78 billion parameters, about three billion active per token, trained on 768 B200 GPUs in Germany and Finland and available under Apache 2.0 on Hugging Face.

  2. Why it matters

    Aleph Alpha claims Kolibri sits on the Pareto front of quality and operating cost in both languages, outperforming compared models with similar architectures on either metric.

  3. What to watch

    The Pareto front claim depends on how Kolibri performs against comparable models in practice; watch whether independent evaluations confirm its 71% score on German benchmarks and its decoding speed versus GPT OSS A5B, Qwen 3.6 A3B, and Gemma 4 A4B.

WHO IT HITSPublic administration, aviation, and industry teams evaluating open-weight models for German-language use are the target adopters, since Aleph Alpha says Kolibri was developed under European law with the EU AI Act in mind.

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Context & Analysis

Aleph Alpha built a dedicated German data pipeline for this project, and German accounts for 21.3 percent of the training data. Chinese models were also used to generate synthetic training data. The model was developed under European law with the EU AI Act in mind. These choices reflect a deliberate approach to training data and regulatory context that the company connects to the model's design.

The reported benchmark figures and speed comparisons give a concrete sense of where Kolibri stands relative to other models. Whether those results hold up under broader testing, and whether the target sectors adopt an open-weight model on this basis, are the open questions the release leaves on the table.

FAQ
What license is Kolibri released under?
The weights are available under an Apache 2.0 license on Hugging Face.
What is Kolibri's context window size?
It supports context windows of up to one million tokens.
Who is Kolibri targeted at?
Aleph Alpha says Kolibri targets public administration, aviation, and industry.

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