The jailbreak of iOS 7.1 until today it did not exist, as its circulation brought and signaled his death evasi0n7.
Ο Chippers Winocm announced at Twitter that he managed to create an “iOS 7.1 untethered boot” on an iPhone 4 device.
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The device runs on an A4 chip, which is known to breaks first with every new firmware Apple releases. Newer chips are much harder to "untethered boot"
With a short video uploaded to YouTube Winocm offers us proof that iOS 7.1 is now jailbroken. However, it is probably very difficult to discover a "hole" for the rest of the chips. It should be mentioned that Winocm has never released one tool about his jailbreak to the public, nor has he ever mentioned that he will do so at some point in the future.
Watch the video