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The title compound, C18H13FN2OS, is the first structural example of a [6–5] fused ring incorporating the 2,3-dihydro-4H-imidazo[5,1-b][1,3]thia­zin-4-one mol­ecular scaffold. The six-membered 2,3-dihydro­-1,3-thia­zin-4-one ring adopts an envelope conformation, with the S—CH2 C atom displaced by 0.761 (2) Å from the five-atom plane (all within 0.05 Å of the mean plane). The imidazole ring is planar. The phenyl ring is twisted from coplanarity with the imidazole ring by 23.84 (5)° and the 4-fluoro­phenyl ring is twisted by 53.36 (6)°, due to a close C(aryl)—H...O=C contact with the thia­zin-4-one carbonyl O atom. The primary inter­molecular inter­action involves a CH2 group with the F atom [C...F = 3.256 (2) Å and C—H...F = 137°].
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