The omens looked good for her when in the first event on day one she took 0.21 seconds off her previous best to win her 100m hurdles in 13.09 seconds.
The Briton’s high jump of 1.95cm was matched by Thiam, before she scored a huge personal best in the shot put – one of her weaker events. The distance of 13.86m was 71cm further than she had ever gone before.
After the 200m, the Briton had a 96-point overnight lead over the Belgian, nine better than her advantage at last year’s European Championships where she eventually finished second.
The pattern continued on Thursday as Johnson-Thompson’s consistency, paired with a below-par Thiam, saw the Liverpool athlete extend her lead.
In the long jump, another of her strong events, she leapt to 6.77m. Thiam, who managed 6.86m in Birmingham in August and defeated the Briton, only went out to 6.40m.
Then came the moments that effectively clinched gold for Johnson-Thompson as first she recorded another PB by throwing the javelin to 43.93m before Thiam, who had been struggling with an elbow injury, only managed 48.04m – her best is 59.32m – and skipped her final throw.
That gave her the 137-point lead over the Belgian going into the 800m, having previously trailed her rival at this stage.
Johnson-Thompson kept her cool during the final event which she won before laying down on the track to contemplate what she had achieved.
Her points total surpassed the previous best of 6,955 set by Dame Jessica Ennis-Hill at the London 2012 Olympics.