> Dozens of other companies, including Google, Meta, and most recently Amazon, have come out with their own foundational models. Some, including Meta’s Llama and Mistral’s 7B, are open source, meaning they can be downloaded and used in other companies’ products free of charge.

To say that these models are open source is debatable. At least by the OSI definition, they aren't [1].

The models are free of charge for commercial use, but it may have restrictions (eg. Llama [2]).

[1] https://opensource.org/ai/open-source-ai-definition

[2] > Can anyone access Llama models? What are the terms? Llama models are broadly available to developers and licensees through a variety of hosting providers and on the Meta website. The Llama models are licensed under the applicable Llama Community License Agreement and accompanying Acceptable Use Policy, which provides a permissive license to the models along with certain restrictions to help ensure that the models are used responsibly. Hosting providers may have additional terms applicable to their services. https://www.llama.com/faq/