Norm Hall/Getty Images The Bengals are the betting favorites, but Cortana likes the Patriots.

Week 4 was a dismal week for Microsoft's Cortana, the Windows phone virtual assistant that's picking every NFL game this year.

Cortana went 5-8 in its worst week of the year.

It's now 34-27 on the year.

That's much worse than Nate Silver's ELO model, which is now 41-20 after going 10-3 in Week 3. It's also worse than Vegas favorites, which have a 35-26 win-loss record on the year.

The Cortana model is powered by Bing Predicts and uses a public-sentiment metric (along with traditional advanced statistics) to make its predictions. It picks games straight up, not against the point spread, so that 34-27 record is pretty rough.

Cortana caught fire in the World Cup group stage, correctly picking 15 of the tournament's last 16 games. Maybe we'll see a similar comeback in its NFL picks.

Here are Cortana's picks for Week 5 as of Friday morning (betting lines in parentheses):

• Minnesota Vikings vs. Green Bay Packers — Packers win, 70.2% chance (Packers -9)

• Chicago Bears vs. Carolina Panthers — Panthers win, 55% chance (Panthers -2.5)

• Cleveland Browns vs. Tennessee Titans — Browns win, 51.5% chance (Titans -1.5)

• St. Louis Rams vs. Philadelphia Eagles — Eagles win, 77.8% chance (Eagles -7)

• Atlanta Falcons vs. New York Giants — Giants win, 59.8% chance (Giants -4)

• Tampa Bay Buccaneers vs. New Orleans Saints — Saints win, 77.8% chance (Saints -10.5)

• Houston Texans vs. Dallas Cowboys — Cowboys win, 72.9% chance (Cowboys -4)

• Buffalo Bills vs. Detroit Lions — Lions win, 59.8% chance (Lions -7)

• Baltimore Ravens vs. Indianapolis Colts — Colts win, 62.9% chance (Colts -3.5)

• Pittsburgh Steelers vs. Jacksonville Jaguars — Steelers win, 78.9% chance (Steelers -6.5)

• Arizona Cardinals vs. Denver Broncos — Broncos win, 64.4% chance (Broncos -7)

• Kansas City Chiefs vs. San Francisco 49ers — 49ers win, 53.3% (49ers -6.5)

• New York Jets vs. San Diego Chargers — Chargers win, 74.2% chance (Chargers -6.5)

• Cincinnati Bengals vs. New England Patriots — Bengals win, 55% chance (Bengals -1)

• Seattle Seahawks vs. Washington Redskins — Seahawks win, 67.4% chance (Seahawks -7.5)

Cortana and Vegas agree on every game except Browns-Titans.

Here are Cortana's results so far this year:

• Week 1 — 10-6

• Week 2 — 9-7

• Week 3 – 10-6

• Week 4 — 5-8

• Total — 34-27

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