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The past decade has seen a dramatic improvement in the quality of dataavailable at both high (HE: 100 MeV to 100 GeV) and very high (VHE: 100 GeV to100 TeV) gamma-ray energies. With three years of data from the Fermi Large AreaTelescope (LAT) and deep pointed observations with arrays of Cherenkovtelescope, continuous spectral coverage from 100 MeV to $\sim10$ TeV exists forthe first time for the brightest gamma-ray sources. The Fermi-LAT is likely tocontinue for several years, resulting in significant improvements in highenergy sensitivity. On the same timescale, the Cherenkov Telescope Array (CTA)will be constructed providing unprecedented VHE capabilities. The optimisationof CTA must take into account competition and complementarity with Fermi, inparticularly in the overlapping energy range 10$-$100 GeV. Here we compare theperformance of Fermi-LAT and the current baseline CTA design for steady andtransient, point-like and extended sources.

Comparison of Fermi-LAT and CTA in the region between 10-100 GeV