Why do companies build open source models?

<!-- SC_OFF --><div class="md"><p>I keep hearing this narrative from non technical investors not really understanding the assumptions. </p> </div><!-- SC_ON --> &#32; submitted by

<!-- SC_OFF --><div class="md"><p>Anyone thought about this? What do you think needs to happen for them to release the old weights? I’d love to see models like Gemini-2.5, OAI o3,

<!-- SC_OFF --><div class="md"><p>The unexpected benefit of open source is that it allows model training companies to train on using your software (and optimizing it) for free.

<!-- SC_OFF --><div class="md"><p>Can someone explain this to me on a technical level? If open models were better in the first place why did everyone go out and built all these AI

<!-- SC_OFF --><div class="md"><p><a href="https://open.spotify.com/episode/2f13gE4nEFP0NI4y61uat8">https://open.spotify.com/episode/2f13gE4nEFP0NI4y61uat8</a></p> <p>Not