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Using spectral data from non-strange and strange hadronic tau decays,flavor-breaking chiral sum rules involving the flavor ud and us current-currenttwo-point functions are constructed and used to determine the SU(3) NNLOlow-energy constant combinations C_{61}^r, C_{12}^r+C_{61}^r+C_{80}^r andC_{12}^r-C_{61}^r+C_{80}^r. The first of these determinations updates theresults of an earlier analysis by Durr and Kambor, while the latter two arenew. The error on the C_{12}^r+C_{61}^r+C_{80}^r is particularly small.Comparisons are made to model estimates for these quantities. The role of thethird combination in significantly improving the determination of the NLOlow-energy constant L_{10}^r from NNLO analyses of the flavor ud V-A correlatoris also highlighted.

NNLO low-energy constants from flavor-breaking chiral sum rules based on hadronic tau-decay data