The Free On-line Dictionary of Computing (30 December 2018):

Loebner Prize

    An annual competition in artificial
   intelligence started by Dr. Hugh Loebner of New York City
   in 1991.  A $100,000 prize is offered to the author of the
   first computer program to pass an unrestricted Turing test.
   Annual competitions are held each year with a $2000 prize for
   the best program on a restricted Turing test.

   Sponsors of previous competitions include: Apple Computer,
   Computerland, Crown Industries, GDE Systems, IBM Personal
   Computer Company's Center for Natural Computing, Greenwich
   Capital Markets, Motorola, the National Science
   Foundation, The Alfred P. Sloan Foundation, and The Weingart
   Foundation.

   The 1995 and 1996 events were unrestricted Turing Tests,
   requiring computer entries to converse indefinitely with no
   topic restrictions.  So far, even the best programs give
   themselves away almost immediately, either by simple
   grammatical mistakes or by repetition.

   Complete transcripts and IBM compatible diskettes that play
   the 1991, 1992, and 1993 conversations in real-time are
   available for purchase from the Cambridge Center for
   Behavioral Studies (telephone: +1 (617) 491 9020, Fax: 1072).
   Sponsorship opportunities are available.

   Loebner Prize Home (http://loebner.net/).

   (2003-11-30)