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AT&T vs Xfinity in Sunnyvale
AT&T brings cheaper, symmetrical fiber up to 5000 Mbps, but Xfinity’s cable reaches more Sunnyvale homes at ~96% coverage versus AT&T’s ~88%.
AT&T wins on speed and price: fiber up to 5000 Mbps (where available), a 98/100 speed score, and $35/mo edge out Xfinity. Xfinity wins on reach, covering ~96% of Sunnyvale versus AT&T’s ~88%, so it’s the safe bet when fiber hasn’t reached your block. AT&T is right for gamers, remote workers, and anyone wanting symmetrical fiber for the lowest listed price. Xfinity is right for households where AT&T fiber isn’t available yet but you still want fast, reliable cable.
At a glance
AT&T vs. Xfinity, side by side.
| Provider | Type | Top speed | City coverage | Starting price | Best for |
|---|---|---|---|---|---|
| AT&T |
Fiber | 5 Gig 5 Gig upload |
88% | $35/mo | Top fiber speeds |
| Xfinity |
Cable | 2 Gig 300 Mbps upload |
96% | $40/mo | Widest availability |
Coverage map
Two different questions, two views. Top speed shows who offers the faster plan where you can actually get it. Coverage shows who reaches more of each ZIP. Or pick a single provider to see just its footprint.
Neighborhood breakdown
Coverage varies block to block in Sunnyvale, so the winner can flip by address. Xfinity’s ~96% cable footprint reaches nearly everywhere, while AT&T’s ~88% fiber is strong but leaves some pockets without service. Always check both providers at your exact address before deciding.
| ZIP | Neighborhoods | Coverage | Top speed | Speed Score | Winner | |||
|---|---|---|---|---|---|---|---|---|
| AT&T | Xfinity | AT&T | Xfinity | AT&T | Xfinity | |||
| 94087 | Cherry Chase, Ponderosa, Cumberland, Raynor Park | 44% | 100% | 5 Gig | 2 Gig | 87 | 95 | Xfinity |
| 94086 | Downtown Sunnyvale, Heritage District, Washington Park, Murphy Avenue | 44% | 98% | 5 Gig | 2 Gig | 87 | 95 | Xfinity |
| 94089 | Moffett Park, Lakewood Village, Baylands | 18% | 100% | 5 Gig | 2 Gig | 82 | 95 | Xfinity |
| 94085 | Lawrence Station, Peery Park, Downtown North | 51% | 95% | 5 Gig | 2 Gig | 89 | 94 | Xfinity |
| 94088 | Sunnyvale (P.O. Boxes) | 37% | 67% | 5 Gig | 2 Gig | 86 | 89 | Xfinity |
Speed Score (0–100) blends each provider’s coverage and top speed in that specific ZIP, so it moves as availability changes street to street.
Which is better for…
The right pick comes down to what you actually do online.
Get connected
Pick your provider and check availability at your address.
- 5 Gig down · 5 Gig up Fiber
- 1 Gig down · 1 Gig up Fiber
- 2 Gig down · 300 Mbps up Cable
- 2 Gig down · 300 Mbps up Fiber
- 1 Gig down · 35 Mbps up Cable
See what’s actually available at your address
Coverage changes from one street to the next. Check your exact address in seconds.
Check my addressFrequently asked questions
is AT&T fiber available at my address in Sunnyvale?
AT&T fiber covers about 88% of Sunnyvale, while Xfinity reaches roughly 96%, so AT&T is likely but not guaranteed at every address. Enter your exact street address on both providers’ sites, since fiber availability changes block to block.
which is cheaper in Sunnyvale, AT&T or Xfinity?
AT&T starts at $35/mo versus Xfinity’s $40/mo, making AT&T the cheaper listed option. Note these are promotional starting rates, so confirm the post-promo price, equipment fees, and any contract terms with each provider before you sign.
which is faster and is it enough for gaming and 4K?
AT&T is faster, with fiber up to 5000/5000 Mbps (where available) and a 98/100 speed score versus Xfinity’s 2000/300 Mbps and 94/100. Both easily handle 4K and gaming, but if you want symmetrical upload for streaming or WFH, choose AT&T where it’s available.