diff --git a/ortools/flatzinc/cp_model_fz_solver.cc b/ortools/flatzinc/cp_model_fz_solver.cc
index dc7a12af9a..3b30ea891f 100644
--- a/ortools/flatzinc/cp_model_fz_solver.cc
+++ b/ortools/flatzinc/cp_model_fz_solver.cc
@@ -1331,19 +1331,20 @@ void SolveFzWithCpModelProto(const fz::Model& fz_model,
   // Fill the search order.
   m.TranslateSearchAnnotations(fz_model.search_annotations(), logger);
 
-  if (p.display_all_solutions && !m.proto.has_objective()) {
+  if (p.search_all_solutions && !m.proto.has_objective()) {
     // Enumerate all sat solutions.
     m.parameters.set_enumerate_all_solutions(true);
   }
 
   m.parameters.set_log_search_progress(p.log_search_progress);
+  m.parameters.set_log_to_stdout(!p.ortools_mode);
 
   // Helps with challenge unit tests.
   m.parameters.set_max_domain_size_when_encoding_eq_neq_constraints(32);
 
   // Computes the number of workers.
   int num_workers = 1;
-  if (p.display_all_solutions && fz_model.objective() == nullptr) {
+  if (p.search_all_solutions && fz_model.objective() == nullptr) {
     if (p.number_of_threads > 1) {
       // We don't support enumerating all solution in parallel for a SAT
       // problem. But note that we do support it for an optimization problem
@@ -1371,7 +1372,7 @@ void SolveFzWithCpModelProto(const fz::Model& fz_model,
     m.parameters.set_keep_all_feasible_solutions_in_presolve(true);
   } else if (num_workers == 1 && p.use_free_search) {  // Free search.
     m.parameters.set_search_branching(SatParameters::AUTOMATIC_SEARCH);
-    if (!p.display_all_solutions && p.ortools_mode) {
+    if (!p.search_all_solutions && p.ortools_mode) {
       m.parameters.set_interleave_search(true);
       if (fz_model.objective() != nullptr) {
         m.parameters.add_subsolvers("default_lp");
@@ -1408,9 +1409,10 @@ void SolveFzWithCpModelProto(const fz::Model& fz_model,
       << sat_params;
   m.parameters.MergeFrom(flag_parameters);
 
-  // We only need an observer if 'p.all_solutions' is true.
+  // We only need an observer if 'p.display_all_solutions' or
+  // 'p.search_all_solutions' are true.
   std::function<void(const CpSolverResponse&)> solution_observer = nullptr;
-  if (p.display_all_solutions) {
+  if (p.display_all_solutions || p.search_all_solutions) {
     solution_observer = [&fz_model, &m, &p,
                          solution_logger](const CpSolverResponse& r) {
       const std::string solution_string =
diff --git a/ortools/flatzinc/cp_model_fz_solver.h b/ortools/flatzinc/cp_model_fz_solver.h
index 1f69045d74..9e1f0260f5 100644
--- a/ortools/flatzinc/cp_model_fz_solver.h
+++ b/ortools/flatzinc/cp_model_fz_solver.h
@@ -23,6 +23,7 @@ namespace operations_research {
 namespace fz {
 
 struct FlatzincSatParameters {
+  bool search_all_solutions = false;
   bool display_all_solutions = false;
   bool use_free_search = false;
   bool log_search_progress = false;
diff --git a/ortools/flatzinc/fz.cc b/ortools/flatzinc/fz.cc
index 0140e5fe6e..263abc13c9 100644
--- a/ortools/flatzinc/fz.cc
+++ b/ortools/flatzinc/fz.cc
@@ -21,9 +21,7 @@
 #include <signal.h>
 #endif  // __GNUC__
 
-#include <csignal>
 #include <iostream>
-#include <limits>
 #include <ostream>
 #include <string>
 #include <vector>
@@ -38,7 +36,6 @@
 #include "ortools/base/logging.h"
 #include "ortools/base/path.h"
 #include "ortools/base/timer.h"
-#include "ortools/base/types.h"
 #include "ortools/flatzinc/cp_model_fz_solver.h"
 #include "ortools/flatzinc/model.h"
 #include "ortools/flatzinc/parser.h"
@@ -46,7 +43,9 @@
 #include "ortools/util/logging.h"
 
 ABSL_FLAG(double, time_limit, 0, "time limit in seconds.");
-ABSL_FLAG(bool, all_solutions, false, "Search for all solutions.");
+ABSL_FLAG(bool, search_all_solutions, false, "Search for all solutions.");
+ABSL_FLAG(bool, display_all_solutions, false,
+          "Display all improving solutions.");
 ABSL_FLAG(bool, free_search, false,
           "If false, the solver must follow the defined search."
           "If true, other search are allowed.");
@@ -67,7 +66,8 @@ namespace operations_research {
 namespace fz {
 
 std::vector<char*> FixAndParseParameters(int* argc, char*** argv) {
-  char all_param[] = "--all_solutions";
+  char all_param[] = "--search_all_solutions";
+  char print_solutions[] = "--display_all_solutions";
   char free_param[] = "--free_search";
   char threads_param[] = "--threads";
   char logging_param[] = "--fz_logging";
@@ -80,6 +80,9 @@ std::vector<char*> FixAndParseParameters(int* argc, char*** argv) {
     if (strcmp((*argv)[i], "-a") == 0) {
       (*argv)[i] = all_param;
     }
+    if (strcmp((*argv)[i], "-i") == 0) {
+      (*argv)[i] = print_solutions;
+    }
     if (strcmp((*argv)[i], "-f") == 0) {
       (*argv)[i] = free_param;
       set_free_search = true;
@@ -206,7 +209,7 @@ int main(int argc, char** argv) {
   operations_research::SolverLogger logger;
   if (absl::GetFlag(FLAGS_ortools_mode)) {
     logger.EnableLogging(true);
-    logger.SetLogToStdOut(false);
+    // log_to_stdout is disabled later.
     logger.AddInfoLoggingCallback(operations_research::fz::LogInFlatzincFormat);
   } else {
     logger.EnableLogging(true);
@@ -218,7 +221,8 @@ int main(int argc, char** argv) {
           input, !absl::GetFlag(FLAGS_read_from_stdin), &logger);
 
   operations_research::fz::FlatzincSatParameters parameters;
-  parameters.display_all_solutions = absl::GetFlag(FLAGS_all_solutions);
+  parameters.display_all_solutions = absl::GetFlag(FLAGS_display_all_solutions);
+  parameters.search_all_solutions = absl::GetFlag(FLAGS_search_all_solutions);
   parameters.use_free_search = absl::GetFlag(FLAGS_free_search);
   parameters.log_search_progress =
       absl::GetFlag(FLAGS_fz_logging) || !absl::GetFlag(FLAGS_ortools_mode);