Wednesday's data was unexpected and defied analyst forecasts of a rise.
The number comes as a relief for the country's central bank and Prime Minister Rishi Sunak in a likely election year.
Investors added to their bets Wednesday on the Bank of England cutting interest rates this year, with many targeting June.
Consumer price inflation is expected to fall further in the coming months.
And that could see the Bank of England start to cut borrowing costs from their 16-year high.
Britain's Office for National Statistics said Britain's core inflation - which excludes volatile prices like food and energy - was also unchanged at 5.1%.
Services inflation rose slightly to 6.5% but was not as strong as the central bank expected.
The bank is keeping a close eye on wage growth, as it fears a rapid rise in wages could add inflationary pressure.
Data published Tuesday showed regular wages rose by an annual 6.2% in the last three months of the year.
It was the slowest rise in more than a year, but double the pace the Bank of England views as consistent with getting inflation back to its target of 2%.
In welcome news for consumers, food inflation fell for the first time in monthly terms since September 2021.
It dropped by 0.4% from December.
