OpenSSH 9.5 is out. Significant changes include a transport-level ping
mechanism and keystroke timing obfuscation:

This attempts to hide inter-keystroke timings by sending
interactive traffic at fixed intervals (default: every 20ms) when
there is only a small amount of data being sent. It also sends fake
“chaff” keystrokes for a random interval after the last real
keystroke. These are controlled by a new ssh_config
ObscureKeystrokeTiming keyword.

Source: LWN.net – OpenSSH 9.5 released