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For the hot exoplanets CoRoT-24b and CoRoT-24c, observations have providedtransit radii R$_{\rm T}$ of 3.7$\pm$0.4 R$_{\oplus}$ and 4.9$\pm$0.5R$_{\oplus}$, and masses of $\le$5.7 M$_{\oplus}$ and 28$\pm$11 M$_{\oplus}$,respectively. We study their upper atmosphere structure and escape applying anhydrodynamic model. Assuming R$_{\rm T} \approx$ R$_{\rm PL}$, where R$_{\rmPL}$ is the planetary radius at the pressure of 100 mbar, we obtained forCoRoT-24b unrealistically high thermally-driven hydrodynamic escape rates. Thisis due to the planet's high temperature and low gravity, independent of thestellar EUV flux. Such high escape rates could last only for $<$100 Myr, whileR$_{\rm PL}$ shrinks till the escape rate becomes less than or equal to themaximum possible EUV-driven escape rate. For CoRoT-24b, R$_{\rm PL}$ must betherefore located at $\approx 1.9-2.2$ R$_{\oplus}$ and high altitudehazes/clouds possibly extinct the light at R$_{\rm T}$. Our analysisconstraints also the planet's mass to be 5$-$5.7 M$_{\oplus}$. For CoRoT-24c,R$_{\rm PL}$ and R$_{\rm T}$ lie too close together to be distinguished in thesame way. Similar differences between R$_{\rm PL}$ and R$_{\rm T}$ may bepresent also for other hot, low-density sub-Neptunes.

Identifying the "true" radius of the hot sub-Neptune CoRoT-24b by mass loss modelling