https://www.theregister.co.uk/2018/06/14/from_ibm_summit_to_exascale/

Comment IBM's 200 petaFLOPS (200,000 trillion calculations per second) Summit supercomputer was unveiled at Oak Ridge National Laboratory last Friday and, scaled up, has proven itself capable of exascale computing in some applications.

That's 1,000 petaFLOPS or one quintillion floating point operations per second.