https://arstechnica.com/information-technology/2024/03/openai-clarifies-the-meaning-of-open-in-its-name-responding-to-musk-lawsuit/

On Tuesday, OpenAI published a blog post titled "OpenAI and Elon Musk" in response to a lawsuit Musk filed last week. The ChatGPT maker shared several archived emails from Musk that suggest he once supported a pivot away from open source practices in the company's quest to develop artificial general intelligence (AGI). The selected emails also imply that the "open" in "OpenAI" means that the ultimate result of its research into AGI should be open to everyone but not necessarily "open source" along the way.