Sonic vs AT&T Fiber: Price, Speed and Whose Network You're Really On

Where you can get both, Sonic usually wins on price and top speed: its El Segundo, California page lists fiber at $40 a month for symmetrical speeds up to 10 Gbps, with free installation, no contract and no data cap. AT&T Fiber costs $50 to $110 a month in October 2026 but tops out at 5 Gbps. AT&T makes more sense if you have AT&T wireless, since bundling can cut fiber to as low as $35 a month, or if you want its wider footprint.

Sonic vs AT&T Fiber at a glance (October 2026)

	Sonic Fiber	AT&T Fiber
Price	$40/mo in El Segundo, no intro-rate jump	300 Mbps $50, 500 Mbps $60, 1 GIG $70, 5 GIG $110 (AutoPay and paperless, plus taxes and fees)
Top speed	Up to 10 Gbps, symmetrical	Up to 5 Gbps, symmetrical
Data cap	None	None
Contract	None	None
Installation	Free	Free
Equipment	ONT installed; use your own router or rent Sonic's eero Wi-Fi	Wi-Fi gateway included; All-Fi Pro included on 5 GIG
Bundle savings	Optional home phone for $10/mo	Fiber from $35/mo with eligible AT&T wireless
Where	70+ cities in California and Texas, including the Bay Area, Los Angeles and Dallas	Parts of many states

Whose network are you on?

A common question is whether Sonic just resells AT&T lines. For Sonic Fiber, the answer is no: Sonic describes its fiber as a wholly owned network that it engineers, builds and installs. AT&T Fiber runs on AT&T's own fiber. The two are separate networks, which is why availability can differ house to house.

Price over time

Sonic says it uses no misleading introductory rates, and lists $40 as the ongoing price in El Segundo. AT&T's October 2026 broadband labels list its prices as standard rates with AutoPay and paperless billing, and AT&T doesn't publish a multi-year price lock unless you bundle eligible wireless. Add taxes and any rented router to compare the real monthly bill.

Speed and equipment

Both services are symmetrical fiber, so uploads match downloads. To use Sonic's 10 Gbps you need 10-gig-capable gear and wired connections; most homes will see their real-world limit set by Wi-Fi, not the plan. AT&T's 1 GIG plan is plenty for most households, and its gateway is included. Our AT&T Fiber vs Spectrum comparison covers AT&T's plans in more detail.

Which should you choose?

• Choose Sonic if its address-specific price is lower for the speed you need, with no contract or intro-rate jump.
• Choose AT&T Fiber if you have AT&T wireless and can use the bundle discount.
• Choose whichever actually serves your address; both are still building out neighborhood by neighborhood.