2020.12.31 13:24:52 (1344620536249212933) from Daniel J. Bernstein:
Not verified yet, so don't put into production, but seems to compute inverses mod 2^255-19 in under 4800 Skylake cycles: https://gcd.cr.yp.to/software.html Also speed records on Haswell, Broadwell, Kaby Lake, etc. Joint work with Bo-Yin Yang. Uses convex-hull calculations from @pwuille.