| Final 19:48 | time | | gap | L | pts | 1. | United States | 3:40.22 | | | 3 | 964 | | Hunter Armstrong 53.07s, Nic Fink 58.27s, Claire Curzan 56.54s, Kate Douglass 52.34s | 2. | Australia | 3:43.12 | | +2.90s | 5 | 927 | | Bradley Woodward 53.92s, Sam Williamson 59.54s, Brianna Throssell 57.22s, Shayna Jack 52.44s | 3. | Great Britain | 3:45.09 | | +4.87s | 4 | 903 | | Medi Harris 1:00.28s, Adam Peaty 59.42s, Matthew Richards 52.87s, Anna Hopkin 52.52s | 4. | Poland | 3:46.04 | | +5.84s | 2 | 891 | | Ksawery Masiuk 53.39s, Dominika Sztandera 1:06.98, Jakub Majerski 51.05s, Katarzyna Wasick 54.62s | 5. | Greece | 3:46.69 | | +6.47s | 6 | 884 | | Apostolos Christou 53.50, Arkadios Aspougalis 1:01.22, Anna Ntountounaki 56.88s, Theodora Drakou 55.09s | 6. | Italy | 3:47.29 | | +7.07s | 8 | 877 | | Michele Lamberti 54.48s, Nicolò Martinenghi 58.21s, Giulia D'Innocenzo 1:00.22, Chiara Tarantino 54.38s | 7. | Sweden | 3:47.46 | | +7.24s | 1 | 875 | | Hanna Rosvall 1:01.50, Erik Persson 1:00.16, Louise Hansson 57.39s, Björn Seeliger 48.41s | 8. | Japan | 3:47.60 | | +7.38s | 7 | 973 | | Osamu Kato 54.68s, Ikuru Hiroshima 1:00.50, Chiharu Iitsuka 58.16s, Nagisa Ikemoto 54.26s |
World and Championship Record: |
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Heats - February | Best 8 times advanced to Final. |
| Heat 4 10:05 | time | | gap | L | pts | Rk | 1. | Great Britain | 3:45.50 | Q | | 3 | 898 | 1. | | Medi Harris 1:00.62, James Wilby 1:00.00, Duncan Scott 52.15s, Anna Hopkin 52.73s | 2. | United States | 3:45.93 | Q | +0.43s | 5 | 893 | 3. | | Jack Aikins 53.49s, Jake Foster 59.29s, Rachel Klinker 58.18s, Addison Sauickie 54.97s | 3. | Greece | 3:46.54 | Q | +1.04s | 7 | 885 | 4. | | Apostolos Christou 53.67s, Arkadios Aspougalis 1:00.54, Anna Ntountounaki 57.37s, Theodora Drakou 54.96s | 4. | Poland | 3:46.57 | Q | +1.07s | 2 | 885 | 5. | | Ksawery Masiuk 53.09s, Dominika Sztandera 1:07.28, Adrian Jaśkiewicz 51.63s, Kornelia Fiedkiewicz 54.57s | 5. | Japan | 3:46.92 | Q | +1.42s | 6 | 881 | 6. | | Osamu Kato 54.30s, Ikuru Hiroshima 1:00.44, Chiharu Iitsuka 58.13s, Nagisa Ikemoto 54.05s | 6. | South Africa | 3:48.03 | | +2.53s | 9 | 868 | 10. | | Pieter Coetze 53.95s, Lara van Niekerk 1:07.23, Erin Gallagher 57.46s, Clayton Jimmie 49.39s | 7. | China | 3:48.16 | | +2.66s | 4 | 867 | 11. | | Chen Jie 1:02.38, Dong Zhihao 59.18s, Yu Yiting 57.46s, Ji Xinjie 48.33s | 8. | Hungary | 3:50.40 | | +4.90s | 8 | 842 | 13. | | Eszter Békési 1:08.99, Richárd Márton 52.69s, Petra Senánszky 54.49s, šdám Jászó 54.23s | 9. | Singapore | 3:51.02 | | +5.02s | 1 | 835 | 14. | | Levenia Sim 1:02.89, En Yi Letitia Sim 1:06.94, Tzen Wei Teong 52.26s, Mikkel Lee 48.93s | 10. | Philippines | 3:53.91 | | +8.41s | 0 | 804 | 16. | | Jerard Jacinto 57.38s, Thanya Dela Cruz 1:08.87, Jarod Hatch 53.35s, Kayla Sanchez 54.31s |
| Heat 3 09:59 | time | | gap | L | pts | Rk | 1. | Australia | 3:45.54 | Q | +0.04s | 4 | 897 | 2. | | Bradley Woodward 53.89s, Sam Williamson 59.49s, Alexandria Perkins 57.47s, Abbey Harkin 54.69s | 2. | Sweden | 3:47.50 | Q | +2.00s | 6 | 874 | 7. | | Hanna Rosvall 1:01.21, Erik Persson 1:00.52, Louise Hansson 56.99s, Robin Hanson 48.78s | 3. | Italy | 3:47.65 | Q | +2.15s | 2 | 873 | 8. | | Michele Lamberti 54.12s, Ludovico Viberti 59.63s, Giulia D'Innocenzo 59.45s, Chiara Tarantino 54.45s | 4. | Canada | 3:47.99 | | +2.49s | 3 | 869 | 9. | | Blake Tierney 54.12s, James Dergousoff 1:01.46, Katerine Savard 58.70s, Taylor Ruck 53.71s | 5. | Spain | 3:49.07 | | +3.57s | 7 | 856 | 12. | | Carmen Weiler 1:01.00, Carles Coll 1:00.56, Mario Mollá 51.98s, María Daza 55.53s | 6. | Kazakhstan | 3:54.45 | | +8.95s | 1 | 799 | 17. | | Xeniya Ignatova 1:02.36, Arsen Korzhakhmetov 1:03.32, Sofia Spodarenko 59.51s, Adilbek Mussin 49.26s | 7. | Slovakia | 3:57.84 | | +12.34s | 9 | 765 | 18. | | Teresa Ivan 1:02.55, František Jablčník 1:04.84, Tibor Tišťan 54.88s, Tamara Potocká 55.57s | 8. | Hong Kong | 4:03.09 | | +17.59s | 8 | 717 | 19. | | Cindy Cheung 1:02.18, Lau Shiu Yue 1:10.14, Natalie Kan 1:00.00, Ian Ho 50.77s | 9. | Thailand | 4:05.94 | | +20.44s | 0 | 692 | 23. | | Ratthawit Thammananthachote 58.10s, Saovanee Boonamphai 1:11.32, Navaphat Wongcharoen 53.71s, Jenjira Srisaard 1:02.81 | -. | Netherlands | DSQ | | | 5 | | | | Maaike de Waard 1:00.67, Casper Corbeau 59.00s, Nyls Korstanje 51.36s, Kira Toussaint |
| Heat 2 09:53 | time | | gap | L | pts | Rk | 1. | Lithuania | 3:51.99 | | +6.49s | 5 | 824 | 15. | | Erikas Grigaitis 55.49s, Rūta Meilutytė 1:07.39, Andrius Ŝidlauskas 53.67s, Smilte Plytnykaitė 55.44s | 2. | Mongolia | 4:05.09 | | +19.59s | 2 | 699 | 20. | | Ariuntamir Enkh-Amgalan 1:04.72, Erkhes Enkhtur 1:05.48, Enkhtamir Batbayar 58.42s, Batbayaryn Enkhkhüslen 56.47s | 3. | India | 4:05.10 | | +19.60s | 8 | 699 | 21. | | Suvana Chetana Baskar 1:06.32, Likhith Selvaraj Prema 1:03.53, Tanish George Mathew 56.04s, Dhinidhi Desinghu 59.21s | 4. | Bahamas | 4:06.91 | | +21.42s | 3 | 684 | 24. | | Lamar Taylor 56.82s, Rhanishka Gibbs 1:12.42, Marvin Johnson 56.94s, Victoria Russell 1:00.73, | 5. | Armenia | 4:08.59 | | +23.09s | 6 | 670 | 25. | | Artur Barseghyan 1:00.88, Ashot Chakhoyan 1:05.44, Varsenik Manucharyan 1:03.62, Ani Poghosyan 58.65s | 6. | Uganda | 4:09.94 | | +24.44s | 0 | 659 | 26. | | Kirabo Namutebi 1:12.34, Tendo Mukalazi 1:07.69, Jesse Ssengonzi 53.76s, Gloria Muzito 56.15s | 7. | Dominicana | 4:14.44 | | +29.44s | 4 | 625 | 28. | | Anthony Pineiro 57.62s, Javier Núñez 1:07.44, María Alejandra Fernández 1:06.43, Alejandra Santana 1:02.95 | 8. | Brunei | 4:20.68 | | +35.18s | 7 | 581 | 29. | | Amani Al-Obaidli 1:06.02, Saud Ghali 1:07.15, Ahmed Theibich 1:02.54, Noor Yusuf Abdulla 1:04.97 | 9. | FS Micronesia | 4:29.25 | | +43.75s | 9 | 527 | 30. | | Katerson Moya 1:07.31, Tasi Limtiaco 1:04.60, Kestra Kihleng 1:11.67, Taeyanna Adams 1:05.67 | -. | Czechia | DNS | | | 1 | | |
| Heat 1 09:47 | time | | gap | L | pts | Rk | 1. | Cook Islands | 4:05.80 | | +20.30s | 6 | 693 | 22. | | Jacob Story 59.91s, Lanihei Connolly 1:10.66, Wesley Roberts 54.69s, Mia Laban 1:00.54 | 2. | Kenya | 4:13.81 | | +28.31s | 3 | 629 | 27. | | Imara Thorpe 1:09.59, Maria Brunlehner 1:14.09, Ridhwan Mohamed 57.84s, Monyo Maina 52.29s | 3. | Guam | 4:30.74 | | +45.24s | 4 | 519 | 31. | | James Hendrix 1:04.34, Israel Poppe 1:11.84, Amaya Bollinger 1:13.33, Mia Lee 1:01.23 | 4. | Maldives | 4:41.83 | | +56.33s | 5 | 460 | 32. | | Hamna Ahmed 1:19.87, Mubal Azzam Ibrahim 1:14.47, Mohamed Rihan Shiham 1:01.39, Aishath Ulya Shaig 1:06.10 |
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