U.S. stocks opened higher on Thursday as oil prices broke $50 a barrel for the first time in seven months. Production has been falling over the past several months, but analysts said the rally may soon fade as $50 oil makes it more profitable for oil companies to boost production. Meanwhile, weekly jobless claims fell by 10,000 over the last week to 268,000. Claims have remained below the 300,000 mark for 64 weeks in a row. Plus, Dollar Tree (DLTR) - Get Report shares surged on Thursday after first quarter comparable store sales rose 2.3 percent. The discount retailer reported earnings of $0.98 a share, beating estimates of $0.81. Finally, Williams Sonoma (WSM) - Get Report shares gained steam after beating Wall Street's estimates on both the top and bottom lines. Revenue rose 6 percent to $1.09 billion. TheStreet's Scott Gamm reports from Wall Street.