Sic transit gloria mundi.
"The C1X elevates Apple’s in-house RF capabilities to tier 1 status. Data from Q4 2025 unequivocally demonstrates that Apple’s in-house C1X modem represents a generational leap over the previous C1 model. Our data indicates that it has achieved real-world parity in download and latency performance with the Qualcomm X80 across numerous networks in both ideal and challenging conditions, proving the silicon is a performance equalizer rather than a compromise."
https://www.ookla.com/articles/apple-iphone-air-c1x-modem-q4-2025