We explore the possibility of obtaining inflation in weakly coupled heteroticstring theory, where the model dependent axions are responsible for drivinginflation. This model can be considered as a certain extrapolation ofm2ϕ2-inflation, and is an attempt to explicitly realize the so calledN-flation proposal in string theory. The instanton generated potentialfor the axions essentially has two parameters; a natural mass scaleM and the stringcoupling gs. For isotropic compactifications leading to axions in the four-dimensional spectrum we find that with the observed temperature fluctuations in the CMB are correctly reproduced. We assume an initiallyrandom distribution for the vacuum expectation values (vevs) of the axions. The spectral index,ns, is genericallymore red than for m2ϕ2-inflation. The greater the vevs, the more red the spectral index becomes. Allowing for awide range of vevs 55 e-foldings from the end of inflation, we find . The tensor-to-scalar ratio, r, is more sensitive to the vevs, but typically smaller than inm2ϕ2-inflation. Furthermore, in the regime where the leading order theory is valid,r is boundedby r < 0.10. The spectral index and the tensor-to-scalar ratio are correlated. For example, corresponds to .