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The B -> X_s gamma branching ratio is currently measured with around 5%accuracy. Further improvement is expected from Belle II. To match such aprecision on the theoretical side, evaluation of O(alpha_s^2) corrections tothe partonic decay b -> X_s^part gamma are necessary, which includes the b -> sgamma, b -> s g gamma, b -> s g g gamma, b -> s qbar q gamma decay channels.Here, we evaluate the unrenormalized contribution to b -> s gamma that stemsfrom the interference of the photonic dipole operator Q_7 and thecurrent-current operators Q_1 and Q_2. Our results, obtained in the cutpropagator approach at the 4-loop level, agree with those found in parallel byFael et al. who have applied the amplitude approach at the 3-loop level.Partial results for the same quantities recently determined by Greub et al.agree with our findings, too.

The Q_{1,2}-Q_7 interference contributions to b -> s gamma at O(alpha_s^2) for the physical value of m_c