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AT&T vs Xfinity in Sunnyvale
Sunnyvale’s trade-off is AT&T’s faster fiber uploads where available versus Xfinity’s broader cable availability and lower coverage risk.
Xfinity is the better overall pick because it reaches about 96% of Sunnyvale, offers stronger availability for everyday households, and starts at $40/mo. AT&T wins on speed, with fiber up to 5,000/5,000 Mbps where it reaches your address, while Xfinity wins on coverage. AT&T also wins on starting price at $35/mo, but its fastest fiber reaches only about 34% of the city. Choose AT&T if its fiber is available and uploads matter; choose Xfinity for broader availability and a simpler bet across Sunnyvale.
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
The choice can shift from block to block in Sunnyvale because AT&T’s overall reach is about 88%, while Xfinity reaches about 96% of the city. AT&T fiber reaches about 34% of the city, so check your exact address rather than relying on neighborhood-level assumptions.
| ZIP | Neighborhoods | Coverage | Top speed | Rank score | Winner | |||
|---|---|---|---|---|---|---|---|---|
| AT&T | Xfinity | AT&T | Xfinity | AT&T | Xfinity | |||
| 94087 | Cherry Chase, Ponderosa, Cumberland, Raynor Park | 44% | 100% | 5 Gig | 2 Gig | 41 | 80 | Xfinity |
| 94086 | Downtown Sunnyvale, Heritage District, Washington Park, Murphy Avenue | 44% | 98% | 5 Gig | 2 Gig | 42 | 78 | Xfinity |
| 94089 | Moffett Park, Lakewood Village, Baylands | 18% | 100% | 5 Gig | 2 Gig | 17 | 80 | Xfinity |
| 94085 | Lawrence Station, Peery Park, Downtown North | 51% | 95% | 5 Gig | 2 Gig | 48 | 76 | Xfinity |
| 94088 | Sunnyvale (P.O. Boxes) | 37% | 67% | 5 Gig | 2 Gig | 35 | 54 | Xfinity |
Rank score (0–100) is each provider’s Speed Score, discounted for weak upload, times the share of that ZIP it reaches — the same rule that orders providers on the Sunnyvale city page, 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
- 100 Mbps down · 20 Mbps up Copper
- 2 Gig down · 300 Mbps up Cable
- 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 Sunnyvale address?
AT&T fiber reaches about 34% of Sunnyvale, while AT&T’s services across all technologies reach about 88% of the city. Check your exact address to confirm whether the faster fiber tier is available before signing up.
Which is cheaper in Sunnyvale, AT&T or Xfinity, and what will I actually pay?
AT&T starts at $35/mo and Xfinity starts at $40/mo, but both are promotional starting rates. Confirm the post-promo rate, equipment fees, and any contract before signing.
Which is faster for gaming, working from home, or 4K streaming?
AT&T is faster where available, with fiber up to 5,000/5,000 Mbps reaching about 34% of the city; Xfinity reaches up to 2,000/300 Mbps on a tier reaching about 45%. Check your address and prioritize AT&T if its fiber tier is available and upload performance matters.