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By confronting the two independent Boltzmann codes CLASS and CAMB, we that for concordance cosmology and for a given recombination history, CMB and matter power spectra can be computed by current codes with an of 0. 01%. We list a few tiny changes in CAMB which are necessary in to reach such a level. Using the common limit of the two codes as a set reference spectra, we derive precision settings corresponding to fixed of error in the computation of a CMB likelihood. We find that for a precision level, CLASS is about 2. 5 times faster than CAMB for computing lensed CMB spectra of a LambdaCDM model. The nature of the main in CLASS (which may each contribute to these performances) is in companion papers.
Julien Lesgourgues (Thu,) studied this question.