Drawing on Cooper's growing experience in single-seater construction, the T23 featured a lightweight tubular frame and a body designed with aerodynamics in mind. Cooling air was supplied through two blocks installed in the front of the car, while exhaust gases were discharged laterally through two pipes. Each new car received individual changes during production, meaning no two examples were identical; only the two works cars were fitted with Bristol engines from the outset.
A dedicated variant was constructed for Stirling Moss, fitted with a De Dion rear axle and an Alta engine instead of the Bristol unit. At least two other Alta-engined cars were built, these forming the basis of a closely related model known as the Cooper T24. Neither the Alta-engined T23 nor the T24 proved more competitive than the Bristol-powered cars.
John Barber gave the T23 its World Championship debut at the 1953 Argentine Grand Prix, driving on behalf of the Cooper Car Company. He qualified sixteenth and finished eighth, a modest but solid introduction for the new design.
The car's best Formula One result was achieved by Ken Wharton, who entered on a private basis. At the 1953 Swiss Grand Prix, Wharton qualified ninth and finished seventh, the high-water mark for the T23 in championship competition. Neither Wharton nor Bob Gerard, the other regular T23 privateer, succeeded in scoring World Championship points during the 1953 season.
Bob Gerard made the car's final World Championship appearance at the 1956 British Grand Prix, qualifying twenty-second and finishing eleventh — three full seasons after the T23's debut, a testament to its durability in private hands. Overall, the T23 was not a front-running Formula One contender; its Bristol engine was outclassed by the more powerful machinery fielded by the major works teams of the era.
The Cooper T23 found more fertile ground in Australian Formula Libre racing. Jack Brabham achieved notable results with a T23 on the Australian domestic circuit, the car proving more competitive against the varied machinery in that series than it was against works Grand Prix equipment in Europe. This Australian success helped establish Brabham's reputation as both a driver and a technical innovator.
The Cooper T23 occupies a transitional position in Cooper's history: more sophisticated than the company's earlier 500cc specials, but not yet the fully competitive Grand Prix weapon that would emerge later in the decade. Its principal historical significance lies in demonstrating that a small British constructor could field a viable — if uncompetitive — car in Formula One using proprietary components, paving the way for the privateer and constructor culture that would define the sport in subsequent years.
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