  In this work, the development of two-dimensional current sheets with respect
to tearing-modes, in collisionless plasmas with a strong guide field, is
analysed. During their non-linear evolution, these thin current sheets can
become unstable to the formation of plasmoids, which allows the magnetic
reconnection process to reach high reconnection rates. We carry out a detailed
study of the impact of a finite $\beta_e$, which also implies finite electron
Larmor radius effects, on the collisionless plasmoid instability. This study is
conducted through a comparison of gyrofluid and gyrokinetic simulations. The
comparison shows in general a good capability of the gyrofluid models in
predicting the plasmoid instability observed with gyrokinetic simulations. We
show that the effects of $\beta_e$ promotes the plasmoid growth. The impact of
the closure applied during the derivation of the gyrofluid model is also
studied through the comparison of the energy variation.
