The model performance is driven by chain of thought, but they will not be providing chain of thought responses to the user for various reasons including competitive advantage.
After the release of GPT4 it became very common to fine-tune non-OpenAI models on GPT4 output. I’d say OpenAI is rightly concerned that fine-tuning on chain of thought responses from this model would allow for quicker reproduction of their results. This forces everyone else to reproduce it the hard way. It’s sad news for open weight models but an understandable decision.
After the release of GPT4 it became very common to fine-tune non-OpenAI models on GPT4 output. I’d say OpenAI is rightly concerned that fine-tuning on chain of thought responses from this model would allow for quicker reproduction of their results. This forces everyone else to reproduce it the hard way. It’s sad news for open weight models but an understandable decision.