Why would open source models be cheaper then closed source?

<table> <tr><td> <a href="https://www.reddit.com/r/singularity/comments/1sjlvh7/do_you_guys_think_theres_a_high_chance_of/"> <img alt="Do you guys think there’s a high chance of

<!-- 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>Hello, </p> <p>Why do companies create open source models? They must allocate lots of resources toward this, but for what profit? If anything,

<table> <tr><td> <a href="https://www.reddit.com/r/LocalLLaMA/comments/1t47qbw/deepseek_v4_pro_matches_gpt52_on_foodtruck_bench/"> <img alt="DeepSeek V4 Pro matches GPT-5.2 on

<!-- SC_OFF --><div class="md"><p>I think the name of the model, mythOS, heavily implies they plan to open source this model soon, including the weights and the training dataset.

<!-- SC_OFF --><div class="md"><p>I’m trying to understand why models from major labs (GPT, Claude, etc.) dominate real-world usage? You might say it's due to the expensive

<!-- SC_OFF --><div class="md"><p>Seems like besides frontier models, open source models are not complying. DeepSeek V4 is in action. Good thing it costs 1$ a month to get these

<!-- SC_OFF --><div class="md"><p>As other players build models that are more capable and cheaper than those offered by OpenAI/Anthropic, aren't OpenAI/Anthropic customers going