Composition obtained by blending at least: a) a (co)polyamide a) of type 66 having an Mn of between 8000 and 18 000 g/mol; b) 5% to 20% by weight of (co)polyamide b) of type 6, relative to the total weight of the blend of (co)polyamide a) and (co)polyamide b), said (co)polyamide b) having an Mn of between 18 000 and 40 000 g/mol; and c) 0% to 90% by weight, relative to the total weight of the composition, of reinforcing fillers; - the ratio of the viscosities in solution, measured according to Standard ISO 307 in formic acid, with a concentration of 5 grams per litre, at a temperature of 25°C, of the (co)polyamide a) relative to the (co)polyamide b) being between 0.3 and 0.8; - said composition having an apparent melt viscosity, in Pa.s, according to the following relationships: η 100 ≤ 8 X + 100 η 1000 ≤ 3 X + 90 in which η is the apparent melt viscosity of the polyamide composition measured at a temperature of 275°C; either at a shear rate of 100 s -1, η100, or at a shear rate of 1000 s -1, η1000; and X corresponds to the proportion by weight of reinforcing fillers, relative to the total weight of the composition; - the apparent melt viscosity being measured according to Standard ISO 11443 and the number-average molecular weight Mn being calculated on the basis of analysis of the end groups. a) a (co)polyamide a) of type 66 having an Mn of between 8000 and 18 000 g/mol; b) 5% to 20% by weight of (co)polyamide b) of type 6, relative to the total weight of the blend of (co)polyamide a) and (co)polyamide b), said (co)polyamide b) having an Mn of between 18 000 and 40 000 g/mol; and c) 0% to 90% by weight, relative to the total weight of the composition, of reinforcing fillers; - the ratio of the viscosities in solution, measured according to Standard ISO 307 in formic acid, with a concentration of 5 grams per litre, at a temperature of 25°C, of the (co)polyamide a) relative to the (co)polyamide b) being between 0.3 and 0.8; - said composition having an apparent melt viscosity, in Pa.s, according to the following relationships: η 100 ≤ 8 X + 100 η 1000 ≤ 3 X + 90 in which η is the apparent melt viscosity of the polyamide composition measured at a temperature of 275°C; either at a shear rate of 100 s -1, η100, or at a shear rate of 1000 s -1, η1000; and X corresponds to the proportion by weight of reinforcing fillers, relative to the total weight of the composition; - the apparent melt viscosity being measured according to Standard ISO 11443 and the number-average molecular weight Mn being calculated on the basis of analysis of the end groups. - the ratio of the viscosities in solution, measured according to Standard ISO 307 in formic acid, with a concentration of 5 grams per litre, at a temperature of 25°C, of the (co)polyamide a) relative to the (co)polyamide b) being between 0.3 and 0.8; - said composition having an apparent melt viscosity, in Pa.s, according to the following relationships: η 100 ≤ 8 X + 100 η 1000 ≤ 3 X + 90 in which η is the apparent melt viscosity of the polyamide composition measured at a temperature of 275°C; either at a shear rate of 100 s -1, η100, or at a shear rate of 1000 s -1, η1000; and X corresponds to the proportion by weight of reinforcing fillers, relative to the total weight of the composition; - the apparent melt viscosity being measured according to Standard ISO 11443 and the number-average molecular weight Mn being calculated on the basis of analysis of the end groups.