  The in-plane thermal conductivity of iron-based superconductor
Ca$_{10}$(Pt$_{4-\delta}$As$_8$)((Fe$_{1-x}$Pt$_{x}$)$_2$As$_2$)$_5$ single
crystal (``10-4-8", $T_c$ = 22 K) was measured down to 80 mK. In zero field,
the residual linear term $\kappa_0/T$ is negligible, suggesting nodeless
superconducting gaps in this multiband compound. In magnetic fields,
$\kappa_0/T$ increases rapidly, which mimics those of multiband superconductor
NbSe$_2$ and LuNi$_2$B$_2$C with highly anisotropic gap. Such a field
dependence of $\kappa_0/T$ is an evidence for multiple superconducting gaps
with quite different magnitudes or highly anisotropic gap. Comparing with the
London penetration depth results of
Ca$_{10}$(Pt$_3$As$_8$)((Fe$_{1-x}$Pt$_{x}$)$_2$As$_2$)$_5$ (``10-3-8")
compound, the 10-4-8 and 10-3-8 compounds may have similar superconducting gap
structure.
