Comment by photochemsyn

Remember when OpenAI was doing this:

"OpenAI threatens to revoke o1 access for asking it about its chain of thought"

https://news.ycombinator.com/item?id=41534474

Not only did DeepSeek opensource their model, they also showed the user chain-of-thought right up front, which everyone else rushed to emulate when they saw how much users liked it.