Looking on the Octopus site, the price changes daily.
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Octopus Tracker is Britain's first tariff to truly follow the wholesale price of energy. Every day, we update the price of your energy based on an independently published wholesale market price — the price available to all suppliers.
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Tracker is a 12-month fixed term tariff, which means that whilst your daily unit rates will change, the formula and the standing charges are set for the duration of your term.
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What seems to be fixed is the formula used to work out the price, and the standing charge.
The price per unit changes daily (using the formula). You keep that fixed formula for 12 months.