That's clear from recent peer - reviewed reports such as Marvel et al 2016: Implications for climate sensitivity from the response to individual forcings, and Sherwood et al. 2014: Spread in model climate sensitivity traced to atmospheric convective mixing. (realclimate.org)
The evident relationship between effective climate sensitivity and ocean heat uptake leads to the transient climate response (TCR) having a smaller spread among the model results than the climate models climate sensitivity alone would suggest (see Section 9.3.1). (ipcc.ch)
«Spread in Model Climate Sensitivity Traced to Atmospheric Convective Mixing.» (history.aip.org)