Sonic vs. AT&T Fiber: Price, Speed, and Network Compared (2026)

If your address qualifies for both Sonic and AT&T fiber, you are choosing between a regional internet provider and a national carrier with four fiber tiers, wireless bundle discounts, and fiber in 32 states. This guide compares Sonic vs. AT&T Fiber on price, speed, fees, availability, and customer satisfaction. It also clears up the most common point of confusion: whose fiber network Sonic actually uses.

The Quick Answer: Sonic or AT&T Fiber?

Sonic is the better value if it serves your address. Sonic Fiber costs $40 per month for symmetrical speeds up to 10 Gbps, with free installation, no contract, and no data caps. AT&T Fiber costs $50 to $110 per month with AutoPay and paperless billing, for speeds from 300 Mbps to 5 Gbps. AT&T is the better choice if Sonic is not available at your address, or if you already have AT&T wireless service and can use its bundle discounts and free Internet Backup.

1. Lowest price: Sonic, starting at $40/mo., with speeds up to 10 Gbps in some areas. AT&T starts at $50/mo. for 300 Mbps.
2. Fastest speed: Sonic, up to 10 Gbps. AT&T tops out at 5 Gbps.
3. Widest availability: AT&T, with fiber in 32 states. Sonic serves 70+ cities in California and Texas.
4. Best for bundling: AT&T, which discounts fiber for eligible AT&T wireless customers.

Comparing Sonic vs. AT&T Fiber

Prices exclude taxes and fees, and may reflect promotional prices. AT&T prices include a $10/mo. AutoPay & Paperless bill discount (applied within two bills). Sources: att.com, sonic.com, Sonic residential.

Does Sonic Use AT&T's Fiber Network?

No. Sonic Fiber runs on Sonic's own network. Sonic says its fiber is “engineered, built and installed by us, not leased or patched together,” and its Sonic Fiber network is wholly owned by Sonic and repaired by Sonic's own employees.

The confusion comes from Sonic's older products. Before it built its own fiber, Sonic sold internet over AT&T's infrastructure, and some legacy customers still have those services. According to Sonic:

1. Fusion DSL: Sonic service delivered over copper phone lines that Sonic leases from AT&T. (Learn more about DSL.)
2. IP Broadband (IPBB-C): AT&T's copper-based service, resold by Sonic, with AT&T handling installation and equipment.
3. IP Broadband (IPBB-F): AT&T's fiber service, resold by Sonic, with AT&T managing the installation, network, and equipment.

So, some legacy Sonic customers do connect over AT&T fiber, but new Sonic Fiber customers get Sonic's own fiber-to-the-home network. AT&T is phasing out its copper network, and Sonic customers who stay on legacy copper service pay a $20/mo. legacy technology fee.

Sonic vs. AT&T Fiber Plans and Pricing

Sonic Fiber Pricing

Sonic keeps pricing simple: one residential fiber plan with symmetrical speeds up to 10 Gbps for $40/mo. New fiber customers get their first two months free, installation is free, and there are no contracts or data caps. That $40/month is the introductory rate and the rate after the intro period ends.

Optional extras include a home phone line for $10/mo. and Sonic Wi-Fi routers by eero for rent. You can also use your own router.

AT&T Fiber Pricing

AT&T simplified its fiber lineup on June 7, 2026, narrowing it to four speed tiers.

*Advertised prices include a $10/mo. AutoPay & Paperless bill discount (within two bills), plus taxes and fees. Limited availability. Source: att.com, checked October 12, 2026.

AT&T also offers a $100 reward card on select plans ordered online. Bundling with an eligible AT&T wireless plan brings fiber to as low as $35/mo., and the bundle discount is largest on the 5 Gig plan, at $25/mo. off.

Which Is Cheaper, Sonic or AT&T?

Sonic is cheaper at every speed tier. Sonic's $40 plan costs $10 less per month than AT&T's slowest 300 Mbps plan, and $70 less than AT&T's 5 Gig plan, while offering twice AT&T's top speed. AT&T's lowest bundled price, $35/mo., is the only way AT&T fiber undercuts Sonic on monthly price, and it requires an eligible AT&T wireless plan.

Over the first year, before taxes and fees, Sonic costs $400 (10 paid months at $40 after two free months). AT&T Internet 1000 costs $840 (12 months at $70) at its advertised price. For context on what fiber typically costs, see our guide to fiber internet prices.

Speed and Technology: 10 Gig vs. 5 Gig

Both providers deliver fiber-optic internet with symmetrical upload speeds, meaning upload and download speeds are equal. That matters for video calls, cloud backups, and livestreaming. The difference is the ceiling:

1. Sonic: up to 10 Gbps. Sonic notes that full 10 Gig speeds require 10-Gigabit-capable equipment and a wired Ethernet connection, which reaches about 9,400 Mbps.
2. AT&T: up to 5 Gbps on Internet 5000, with a single-device wired maximum of 4.7 Gbps.

For most households, both are more than enough. Even 4K streaming uses only a small fraction of a gigabit (see what internet speed you need for streaming). Multi-gig speeds pay off mainly for large households, large and frequent uploads, and homes with multi-gig wired networks and multiple users. Wi-Fi rarely delivers multi-gig speeds to a single device, so read up on wired vs. Wi-Fi internet for realistic expectations and check your results with a free internet speed test. Not sure if you need more speed? See when it's time to upgrade your internet plan.

Availability: Where Can You Get Sonic and AT&T Fiber?

Availability is the biggest difference between these two providers.

Sonic serves more than 70 cities across California and Texas. Its core footprint is the San Francisco Bay Area, and in 2026 it began expanding fiber into the Los Angeles and Dallas metro areas, with new addresses being activated through the end of 2026. If Sonic is still building near you, you can pre-order service. You'll get notified when it's available at your address.

AT&T Fiber is available in 32 states after AT&T closed its acquisition of Lumen's consumer fiber business on February 2, 2026, adding more than 4 million fiber locations across 11 states.

Where they overlap: AT&T is the traditional phone company in California and Texas, so the two providers most often compete in Sonic's Bay Area, Los Angeles, and Dallas markets. Availability is decided address by address, so check which providers serve your address.

Fees, Equipment, and Contracts

Data is valid as of October 2026 and is subject to change.

Neither provider charges overage fees, because neither has data caps on fiber. Both install an optical network terminal (ONT) at your home that converts the fiber signal for your router or gateway. Most of the time, the ONT is a proprietary piece of equipment. So, take a moment to learn about the equipment fiber internet requires first.

Bundles and Extras

AT&T rewards customers who also use AT&T wireless. Bundled customers can get fiber as low as $35/mo. and free Internet Backup, which switches your home connection to cellular data if the fiber network goes down. AT&T's 5 Gig plan includes All-Fi Pro whole-home Wi-Fi.

AT&T no longer owns DIRECTV. It sold its remaining 70% stake in DIRECTV to TPG on July 2, 2025, so AT&T's current fiber bundles center on wireless service rather than TV.

Sonic skips bundles by design and advertises “no confusing bundles.” Its only add-on is an optional $10/mo. home phone line. Sonic's Worry-Free WiFi includes free in-home technician visits, free equipment replacements, and a Wi-Fi health check during installation.

Customer Satisfaction: Sonic vs. AT&T

Both providers have strong satisfaction ratings, but each cites a different survey:

1. AT&T Fiber has ranked highest among fiber internet providers in the American Customer Satisfaction Index (ACSI) for four straight years, according to AT&T.
2. Sonic cites a #1 customer satisfaction ranking from Consumer Reports and emphasizes local, live phone support.

Because the rankings come from different surveys, neither is a head-to-head comparison. For more on how ISPs are rated, see our internet customer satisfaction survey.

Sonic vs. AT&T Fiber: Which Should You Choose?

Choose Sonic If…

1. Sonic Fiber is available at your address.
2. You want the fastest available speed (10 Gbps) at the lowest price ($40/mo.).
3. You prefer one flat price with no bundles, AutoPay requirements, or contracts.
4. You value a local provider with live phone support.

Choose AT&T Fiber If…

1. Sonic does not serve your address or is still building in your area.
2. You have, or plan to get, an eligible AT&T wireless plan for bundle discounts and free Internet Backup.
3. You want a plan that's below gigabit speed, or a provider available in 32 states.
4. You want managed whole-home Wi-Fi 7 through All-Fi Pro.

Still comparing options? Our guide on how to choose an internet provider walks through the full decision, and our list of internet providers without contracts covers more no-commitment plans.