In Week 13 of the NFL season, the San Francisco 49ers faced a significant downturn, losing their third consecutive game and dropping to a 5-7 record. Their playoff chances are slim, with only an 8.5% likelihood of making it to the postseason. The article highlights the struggles of the 49ers' offense and defense, suggesting that both have been underperforming compared to previous seasons. Meanwhile, the Pittsburgh Steelers have shown an offensive resurgence, credited to head coach Arthur Smith's adjustments. The article also discusses the implications of these trends for the remainder of the season.

• The 49ers are struggling significantly, with a potential end to their Super Bowl window.
• The Steelers' offense has improved under Arthur Smith's leadership.