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Sort of. There are only 302 neurons in a nematode, but knowing what weights to put on each of them is an issue.

PS: Not mine but this looks like a good summery. http://www.jefftk.com/news/2011-11-02

Actually if you read that link carefully - complete (or even complex) nematode behavior has never been simulated. Different teams have simulated different traits of behavior such as reaction to pokes on the head, non-spontaneous sinusoidal locomotion (there are different kinds of nematode locomotion triggered by the viscosity of the environment). Nothing resembling a learning nematode, indistinguishable from the real thing in terms of behavior, has ever been achieved (unfortunately).

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