We are looking at installing a 36" 6 burner oven/range combo unit in our kitchen, and the model we are considering states we need to run a 3/4" or larger pipe up to the connection of the unit, and then to connect the gas line to the unit, the unit inlet is a 1/2" connection.

Right now we have the area plumbed with 1/2" pipe (from the current unit). Should I expect to repipe the gas line all the way to 3/4" or am I likely fine since the incoming line at the unit is 1/2"

Depends on the length of pipe run and total BTU consumption of the appliance. If it were me I'd send it as-is because it's unlikely that you'll be running every burner on full blast simultaneously, and the rating assumes an absolute max draw plus some margin.

Could you have the meter recalibrated and install higher pressure regulator to boost the flow if the flow is insufficient?

Kenneth_2003 said:

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Could you have the meter recalibrated and install higher pressure regulator to boost the flow if the flow is insufficient?

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We do have an increased meter due to a generator installed, so that's kind of where my head was at though I don't know if this is a thing or not.

I have 2 tankless water heaters and this range oven as the only appliances on gas in my house.

Larger meter is not the same as upgrading to higher pressure. Most residential gas systems are 1/2 psi, independent of sizing of the meter itself. You can have the gas company change out the regulator on the meter so that you have 2 psi pressure inside the house. This does require step-down regulators at each appliance. What happens then is that the overall capacity of the system (and the piping) is greatly increased. You can usually tell if a system is 2 psi because the regulator at the meter will have a red marking on it.