Yes, you can absolutely use the Japan Rail (JR) Pass to travel to and within Osaka in 2026, though there are important nuances to maximize its value. The pass covers the Tokaido Shinkansen (bullet train) from Tokyo to Shin-Osaka Station; however, you must use the Hikari or Kodama services rather than the faster Nozomi (unless you pay a significant supplemental fee). Within the city, the JR Pass is valid on the JR Osaka Loop Line and other JR-operated lines (like the Yamatoji or Hanwa lines), which are convenient for reaching major spots like Osaka Castle or Universal City. Crucially, the JR Pass does not cover the Osaka Metro (subway) or private rail lines like Kintetsu or Hankyu, which are often more direct for reaching the Namba or Shinsaibashi districts. Since the massive price hike in late 2023, using the pass solely for a Tokyo-Osaka round trip is no longer cost-effective; it only "breaks even" in 2026 if your itinerary includes additional long-distance legs to cities like Hiroshima or Kanazawa within the 7, 14, or 21-day validity window.