U.S. crude oil production in October hit a record 12.66 million barrels per day (bbl/d), up from a revised 12.48 million bbl/d in September, the U.S. government said in a monthly report on Dec. 31.

Weekly production figures have already shown the United States surpassing 13 million bbl/d in production, but that data is considered less reliable than the monthly figures.

The U.S. has become the world's largest oil producer as technological advances have increased production from shale formations, and it has also become a leading exporter.

U.S. crude exports rose to 3.38 million bbl/d in October, up from 3.09 million bbl/d the previous month, the U.S. Energy Information Administration (EIA) said.

Production in Texas rose to a record 5.27 million bbl/d, the EIA said, while North Dakota also reached a new high of 1.47 million bbl/d. New Mexico's output rose to 982,000 bbl/d, also a record.

U.S. natural gas output in the Lower 48 states rose to a record 106.08 billion cubic feet per day (Bcf/d) in October from a revised 105.09 Bcf/d in September, the EIA said in its monthly 914 report.

Production in the largest gas producer, Texas, fell by 0.5% to 29.14 Bcf/d, and fell by 0.1% in Pennsylvania, the second-largest gas-producing state. Output rose by 7.4% in Alaska.