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As I know, any SAT solver such as or-tools or cplex cp optimizer converts a given problem to CNF form in the first place. Is it possible to extract the resulting CNF representation from or-tools or cplex?

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    $\begingroup$ CPLEX CPO is not a SAT solver but a CP solver. To our knowledge, it does not convert the given model to CNF form. Google OR Tools CP-SAT solver is not a pure SAT solver as well. Roughly speaking, this is a CP solver that embeds SAT techniques as subroutines. The model is given following a CP formalism. $\endgroup$ Jul 16 at 21:16
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CP-SAT uses a SAT backend. But at any moment, just like with SMT solvers, the full model is never fully represented using clauses and Boolean literals. I recommend looking at the CPAIOR 2020 masterclass on CP (on YouTube) to get a better understanding of the architecture of the solver.

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