I'd argue AMD and Intel were pretty close in single-threaded performance until the Core 2 Duo (released in 2006).
Here's a top of the line Intel Pentium 4 3.46 Extreme Edition being unable to compete with AMD processors running at 66% of the clock speed of the Intel.
https://www.anandtech.com/show/1529
I really don't count Core Duo, even though I had a Macbook equipped with one. The Core 2 Duo was Intel's first real competition to Athlon 64.