Powered by the Android 4.0 Ice Cream Sandwich operating system, the Huawei Ascend P1 S is described as the "fastest and most compact smartphone in its class".
It features a dual-core 1.5GHz TI OMAP 4460 Cortext-A9 processor with a 4.3-inch Super AMOLED 960 x 540 touchscreen, built with Corning Gorilla Glass.
Huawei has also today introduced the Ascend P1, which boasts the same functionality as the P1 S but with a 7.69mm form factor.
Both phones come with a 1670mAh/1800mAh battery, multi-tasking, video replay and a PPVD back cover coating that is claimed to "evenly distribute heat".
The handsets have eight-megapixel cameras on the rear and 1.3 HD cameras on the front, equipped with dual flash LED and HDR effect optimisation, as well as 1080p HD video-capture capabilities.
"We're excited to unveil the world's slimmest smartphone here at CES 2012," said Richard Yu, the chairman of Huawei Device.
"The Ascend P1 S demonstrates our ongoing commitment to innovating high quality devices that utilise the latest hardware and software technologies."
The Huawei Ascend P1 and P1 S will be available in Asia-Pacific, North America, Australia, Middle East, and China from April 2012, as well as certain markets in Europe. The phones are expected to become available in the UK in early Q3 this year.
Casings for both phones come in metallic black, ceramic white and cherry-blossom pink.
Huawei UK executive vice president Mark Mitchinson said: "These are extremely stylish and powerful devices, which we expect to be available to UK consumers from early Q3. Huawei's Ascend P1 series will be backed in the UK by a multi-million pound marketing campaign."
> Huawei announces Mediapad, Vision smartphone for UK
> Huawei in talks with Microsoft to avoid Android clash