On 25 October 2020, 11:30:07 UTC, PrimeGrid's 321 Search found the Mega Prime:
The prime is 4,939,547 digits long and enters Chris Caldwell's “The Largest Known Primes Database” ranked 21st overall.
The discovery was made by Dr. James Scott Brown (Scott Brown) of the United States using an Intel(R) Core(TM) i7-4770S CPU @ 3.10GHz with 8GB RAM, running Microsoft Windows 10 Enterprise x64 Edition. This computer took about 6 hours, 6 minutes to complete the primality test using LLR2. Dr. James Scott Brown is a member of the Aggie The Pew team.
For more details, please see the official announcement.