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Follow up tweets from Elon:

https://x.com/elonmusk/status/1819779440752181445

Important to note that the induced mass (mass required by a given engine design that is not the engine itself) of Raptor 3, while far better than Raptor 2, still has a lot of room for improvement.

Thrust will exceed 300 tons with Raptor 3.x (thrust/mass>200), enabling 10,000 tons of thrust at liftoff and there might be up to 5 sec of Isp gain over time.

Getting close to the limit of known physics.

https://x.com/elonmusk/status/1819781279828636041

In a few years, we will finally have a Raptor 3/4 vacuum version (giant nozzle) that has an Isp of 380