We are pleased to announce a new release of Sundials/ML, an OCaml interface to the Sundials suite of numerical solvers (CVODE, CVODES, IDA, IDAS, ARKODE, KINSOL). This release includes support for all new features in Sundials 2.6.x (namely the ARKODE solver, OpenMP and Pthreads nvectors, sparse matrices, and the KLU and SuperLU/MT linear solvers), but continues to work with the older version (2.5.0) that is still provided by many packaging systems. Information and documentation: http://inria-parkas.github.io/sundialsml/ Source code (BSD): https://github.com/inria-parkas/sundialsml opam install sundialsml # (requires Sundials 2.5.0 or above) There is a draft report that describes our implementation. It is not quite ready for public release, but we would be happy to share it by private mail. We gratefully acknowledge the original authors of Sundials, and the support of the ITEA 3 project 11004 MODRIO (Model driven physical systems operation), Inria, and the Departement d'Informatique de l'ENS. Timothy Bourke, Jun Inoue, and Marc Pouzet.