CEO Tim Cook presided over the launch at a media event held at Apple's headquarters in Cupertino, Calif., and simulcast to Beijing, Berlin and Tokyo.
Apple updated the processor in its MacBook Pro in February and did the same for its MacBook Air in June, but those were relatively minor product revisions. The new iPhones bring major changes in hardware and software and precede the arrival of OS X Mavericks and of a radically re-engineered Mac Pro next month. Their reception will be closely watched as a bellwether for Apple, which faces ongoing doubts about its ability to continue innovating without the guidance of its uncompromising co-founder Steve Jobs.
[ Learn more about Apple's upcoming mobile OS update. Read Apple iOS 7: 6 Reasons Enterprises Must Upgrade. ]
Phil Schiller, senior VP of worldwide marketing, addressed those doubts directly at Apple's Worldwide Developer Conference in June when presenting a preview of the forthcoming Mac Pro redesign. "Can't innovate anymore, my ass," he said.
Apple has something to prove and the two new iPhone models speak well of its efforts.
The iPhones are scheduled be available on Sept. 20, with the iPhone 5c ready for pre-order on Sept. 13. Both will ship with iOS 7, a substantially redesigned version of Apple's popular mobile operating system. The flat, colorful look of iOS 7 represents the fruit of reconfigured product leadership at Apple: Last year, CEO Tim Cook ousted mobile software chief Scott Forstall, a favorite of Cook's predecessor Steve Jobs, and gave Forstall's software responsibilities to Jonathan Ive, the company's celebrated head of industrial design.
In iOS 7, Apple's Siri personal assistant software gains the ability to search tweets, Wikipedia and photos, and can perform inline Web searches. iOS 7 includes iTunes Radio, improved ringtones and many other features such as Control Center, Notification Center and AirDrop file sharing. It will be available for download on Sept. 18 at no charge for iPhone 4 and later, iPad 2 and later, iPad Mini and iPod Touch (fifth generation).
Apple is also making iOS versions of its iWork productivity apps and iLife creative suite available as free downloads to those who purchase a new iPhone 5s, a move that could erode enthusiasm for Microsoft Office and Google Apps.
The iPhone 5s comes in three configurations: 16 GB ($199), 32 GB ($299) and 64 GB ($399) with a two-year contract. There are three color options: gray, silver and gold. It features an ARM-based 64-bit A7 processor. Schiller said the chip runs twice as fast as the processor powering the iPhone 5 and supports OpenGL/ES 3.0. The A7 includes a new component, the M7 motion processor, which continuously monitors motion data in conjunction with sensors like the accelerometer, compass and gyroscope. As a result, Apple's flagship iPhone should improve the responsiveness of health and exercise apps and open up new possibilities for developers.
The iPhone 5s includes an 8-megapixel rear-facing camera with an f/2.2 aperture lens that captures 720p video at 120 FPS, a dual LED flash that improves skin-tone realism and a 1.2-megapixel front-facing camera for FaceTime chats. Schiller claims the device's battery can last on standby mode for 250 hours and can power LTE or Wi-Fi browsing for 10 hours.
As widely anticipated, iPhone 5s features a Touch ID fingerprint scanner, which can be used to authenticate the device owner or other users and grant access to the device without the need for a passcode. The scanning hardware can read the user's fingerprint at any device orientation and is built into the Home button, Apple said. It can also be used for purchase authentication in the iTunes App Store.