Jan 30 (Reuters) - Nvidia's ( NVDA ) plan to invest up to $100 billion in OpenAI to help it train and run its latest artificial-intelligence models has ‌stalled after some inside the chip giant expressed ​doubts about the deal, the Wall Street ‍Journal reported on Friday. 

Both ⁠companies are ⁠rethinking the future of their partnership, and the ‌latest discussions include an ​equity investment of tens of billions of dollars as part ⁠of OpenAI's current ‍funding round, ​the Journal said, citing people familiar with the matter. 

Nvidia ( NVDA ) CEO Jensen Huang ‍has privately emphasized to industry associates in recent months that the original $100 billion agreement was non-binding and not finalized, the report said.

Huang has also ​privately ‍criticized what he has described as a lack of discipline in ​OpenAI's business approach and expressed concern about the competition it faces from the likes of Alphabet's Google and Anthropic, the WSJ added.

Reuters could not immediately verify the ​report. OpenAI and Nvidia ( NVDA ) did not immediately respond to Reuters' request for comment.