The API solves CAPTCHAs in less than ten seconds and is accurate "at least 95%" of the time. The service uses REST calls and through it users can, submit your CAPTCHA image, send correctness feedback so Bypass CAPTCHA can track accuracy and only charge for correct solutions, as well as check account information. By default, it will not decode captchas in Case-Sensitive way. But however, they support that. If you need that to be done, you need to contact and tell them your key and requirement, they will enable your key for that feature. And in future, if you still need that feature to be enabled, you may need to fill credits on your old key, instead of buying a new key.

Tight integration with NumPy – Use numpy.ndarray in Theano-compiled functions. Transparent use of a GPU – Perform data-intensive computations much faster than on a CPU. Efficient symbolic differentiation – Theano does your derivatives for functions with one or many inputs. Speed and stability optimizations – Get the right answer for log(1+x) even when x is really tiny. Ddynamic C code generation – Evaluate expressions faster. Extensive unit-testing and self-verification – Detect and diagnose many types of errors.