The OnePlus 2 is a hair shorter and narrower than the OnePlus 2, but it's also 8 percent thicker than the newer handset.
The OnePlus 2 is 8 percent heavier than the older smartphone.
The new model switches from a faux metal (plastic) frame to an aluminum/magnesium alloy.
The OnePlus 2 ships again with a sandstone back (likely a thin layer of sandstone on top of plastic) by default, but users can pick up natural wood or kevlar replacement backs from the company's store for US$27 a piece, then swap them out at home.
It's a similar story with the OnePlus One, but if you're looking to go beyond sandstone, your only option is bamboo.
OnePlus stuck with a 5.5-inch screen size for the new model.
While plenty of Android phone manufacturers have moved their flagships into the land of Quad HD, OnePlus stuck with 1080p for its 2015 smartphone.
The company has reportedly upped the contrast ratio on the newer handset, which now rests at 1,500:1, besting the iPhone 6's 1,400:1 panel (at least on paper).
Both devices have IPS display panels.
Both handsets give you the choice between using onscreen or below screen (capacitive) navigation keys.
OnePlus sells both its flagships in 16 and 64 GB of internal storage tiers.
It might be wise to opt for the more spacious internal storage option, though, as there's no microSD card slot on either handset.
The OnePlus One carries one of 2014's most competent chips, but the newer phone's 64-bit, octa core offering is easily the stronger of the two.
The 16 GB version of the OnePlus 2 offers 3 GB RAM, while the 64 GB variant jumps up to 4 GB.
The OnePlus 2 has a slightly bigger battery than we saw in the older model.
Neither device allows you to swap out its battery.
The megapixel count is identical on both models.
It's the same story here, with both rear shooters having ƒ/2.0 aperture.
Neither handset has wireless charging tech.
While most high-end smartphones include NFC, OnePlus left it out of its 2015 flagship.
You'll find a standard micro USB connector on the OnePlus One, while the OnePlus 2 makes use of the newer USB Type C standard. It's reversible, so you won't have to fumble around, figuring out which way is up.
A unique addition to the newer handset is a physical toggle for switching among Android's different notification profiles ("All," "Priority" and "None"). On other Lollipop-running phones (including the OnePlus One), you'll need to wake up your phone to make that change.
While the OnePlus One originally shipped with the highly customizable Cyanogenmod flavor of Android, the company has since created its own custom version of Android, known as OxygenOS. That's what you'll now find running on both devices.
Based on the latest Lollipop flavor of the OS, the skin is pretty close to stock Android, with just a few changes – including those swappable navigation keys, a dark mode, gesture launch shortcuts and pre-installed Swiftkey keyboard.
The OnePlus 2 will start shipping to some customers starting on August 11. That asterisk next to the OnePlus 2, though, leads us into the next category ...
Buy without invite
Though the OnePlus One is now available for anyone to order, the company resurrected its invite-only system for the OnePlus 2: you'll need to sign up and wait for an invite before you can buy the handset. By the time you get your hands on one, you may also have the option of buying new 2015 flagships from Apple, Samsung (Galaxy Note 5) and Motorola.
Starting price (full retail)
Both OnePlus' smartphones offer outstanding specs-to-price ratios. Setting aside the annoying invite system for a moment, the OnePlus 2 may sit alongside the Moto X Style (Pure Edition) as the two best bang-for-your-buck Android flagships of the year.
For more, you can read Gizmag's review of the original OnePlus One.
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