The game theory behind AGI research is identical to that of nuclear weapons development. There exists a development gap (the size of which is unknowable ahead of time) where an actor that achieves AGI first, and plays their cards right, can permanently suppress all other AGI research.
Even if one's intentions are completely good, failure to be first could result in never being able to reach the finish line. It's absolutely in OpenAI's interest to conceal critical information, and mislead competing actors into thinking they don't have to move as quickly as they can.