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If there’s still no clear winner, a jump off takes place to determine the winner, where jumpers get one opportunity to clear the next height mark. The crossbar is then alternately lowered and raised until only one jumper succeeds.
In 2009, though, a new rule was introduced where the jump off was made optional, which meant that athletes could share the top spot if it was mutually agreed upon.
The rule memorably came into effect at the Tokyo 2020 men’s high jump event, where Qatar’s Mutaz Essa Barshim and Italy’s Gianmarco Tamberi opted to share the gold medal.
https://olympics.com/en/news/high-jump-rules-regulations-athletics-sports