Google released Gemma 4 open AI models under the Apache 2.0 license—a significant shift from the previous custom license. Apache 2.0 is one of the most permissive open source licenses, meaning genuine commercial freedom for self-hosters and developers. While competitors keep tightening their licenses, Google is making a genuine open source play in the model space.

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Source: https://arstechnica.com/ai/2026/04/google-announces-gemma-4-open-ai-models-switches-to-apache-2-0-license/

Google announces Gemma 4 open AI models, switches to Apache 2.0 license

Gemma 4 brings the first major update to Google's open models in a year.

Ars Technica