On North Texas clay, yes: reinforcement earns its cost. The common spec is #3 rebar on 18 to 24 inch centers, supported on chairs so the steel sits mid-slab. Steel does not prevent cracks; it holds them tight so the slab keeps acting like one piece.
More detail
Concrete cracks; that is not a defect, it is a material property. Reinforcement exists to control what happens next. Unreinforced slabs on expansive clay crack, then the cracks widen, offset in height, and let water into the base, and the failure compounds. Reinforced slabs crack hairline inside the control joints and stay locked together, which is the difference between a driveway that ages and one that breaks up. The spec details matter more than the buzzwords. Bar (#3, sometimes #4 at heavy sections) on 18 to 24 inch centers is the standard here. Placement decides whether you got what you paid for: steel lying on the dirt does nothing, so it goes on chairs or gets pulled to mid-slab during the pour. Welded wire mesh can work when it is engineered sheet mesh properly supported, but mesh trampled to the bottom of the pour is the classic corner cut. Fiber additives improve surface characteristics and help with plastic shrinkage, but fiber alone is not structural reinforcement for clay-country driveways. One more honesty check: reinforcement is the second line of defense. The first is the base. A reinforced slab over uncompacted fill still settles; the steel just holds the broken pieces politely together. The written scope here states bar size, spacing, and support, and the base preparation above it, so both defenses are on paper.