This release provides for that, will full access to:
a. What OpenAI calls "chain of thought" or "reasoning" (actually means a generated sequence of likelihood-based inferences following from the prompt and leading to a final generation).
This is super useful for debugging, explainability, foresight into future outcomes, safety, control.
b. Log probabilities of tokens. That is, the actual numeric values for how likely different outputs are--key to making informed predictions about what the model is most likely to do and not do in different scenarios. (OpenAI had made offered this in some cases before; now there's full control.)
8. Then there are the many other reasons why "openness" in technology is beneficial in general, given it's being released. Everything from enabling accountability to supporting reproducibility to lowering barriers to preserving privacy.