diff --git a/external_parser/CMakeLists.txt b/external_parser/CMakeLists.txt
index 99a822c0d..9b316806a 100644
--- a/external_parser/CMakeLists.txt
+++ b/external_parser/CMakeLists.txt
@@ -135,7 +135,7 @@ set(binary_parser_headers
   ${CMAKE_CURRENT_LIST_DIR}/joiners/i_joiner.h
   ${CMAKE_CURRENT_LIST_DIR}/joiners/multistep_example_joiner.h
   ${CMAKE_CURRENT_LIST_DIR}/log_converter.h
-  ${CMAKE_CURRENT_LIST_DIR}/lru_dedup_cache.h
+  ${CMAKE_CURRENT_LIST_DIR}/../rlclientlib/example_cache/lru_dedup_cache.h
   ${CMAKE_CURRENT_LIST_DIR}/parse_example_binary.h
   ${CMAKE_CURRENT_LIST_DIR}/parse_example_converter.h
   ${CMAKE_CURRENT_LIST_DIR}/parse_example_external.h
@@ -146,7 +146,7 @@ set(binary_parser_sources
   ${CMAKE_CURRENT_LIST_DIR}/joiners/example_joiner.cc
   ${CMAKE_CURRENT_LIST_DIR}/joiners/multistep_example_joiner.cc
   ${CMAKE_CURRENT_LIST_DIR}/log_converter.cc
-  ${CMAKE_CURRENT_LIST_DIR}/lru_dedup_cache.cc
+  ${CMAKE_CURRENT_LIST_DIR}/../rlclientlib/example_cache/lru_dedup_cache.cc
   ${CMAKE_CURRENT_LIST_DIR}/parse_example_binary.cc
   ${CMAKE_CURRENT_LIST_DIR}/parse_example_converter.cc
   ${CMAKE_CURRENT_LIST_DIR}/parse_example_external.cc
@@ -161,6 +161,7 @@ target_include_directories(rl_binary_parser
     ${CMAKE_CURRENT_LIST_DIR}/../ext_libs/zstd/lib/
     ${CMAKE_CURRENT_LIST_DIR}/../ext_libs/date/
 )
+target_include_directories(rl_binary_parser PRIVATE ${CMAKE_CURRENT_LIST_DIR}/../rlclientlib/example_cache/)
 
 # If flatbuffers found via CONFIG, add its target as a library dependency
 # Otherwise, the flatbuffers MODULE defines FLATBUFFERS_INCLUDE_DIR to add to the include path
diff --git a/external_parser/joiners/example_joiner.h b/external_parser/joiners/example_joiner.h
index efc11127c..c44346aa4 100644
--- a/external_parser/joiners/example_joiner.h
+++ b/external_parser/joiners/example_joiner.h
@@ -1,9 +1,9 @@
 #pragma once
 
+#include "../rlclientlib/example_cache/lru_dedup_cache.h"
 #include "event_processors/joined_event.h"
 #include "event_processors/loop.h"
 #include "joiners/i_joiner.h"
-#include "lru_dedup_cache.h"
 #include "metrics/metrics.h"
 #include "parse_example_external.h"
 #include "vw/core/error_constants.h"
diff --git a/external_parser/joiners/i_joiner.h b/external_parser/joiners/i_joiner.h
index c7dd5c8f4..fad083684 100644
--- a/external_parser/joiners/i_joiner.h
+++ b/external_parser/joiners/i_joiner.h
@@ -1,10 +1,10 @@
 #pragma once
 
+#include "../rlclientlib/example_cache/lru_dedup_cache.h"
 #include "event_processors/reward.h"
 #include "generated/v2/CbEvent_generated.h"
 #include "generated/v2/FileFormat_generated.h"
 #include "generated/v2/Metadata_generated.h"
-#include "lru_dedup_cache.h"
 #include "metrics/metrics.h"
 #include "parse_example_external.h"
 #include "vw/core/error_constants.h"
diff --git a/external_parser/unit_tests/test_lru_dedup_cache.cc b/external_parser/unit_tests/test_lru_dedup_cache.cc
index f6abdc267..11973cf4a 100644
--- a/external_parser/unit_tests/test_lru_dedup_cache.cc
+++ b/external_parser/unit_tests/test_lru_dedup_cache.cc
@@ -1,6 +1,6 @@
 #include <boost/test/unit_test.hpp>
 
-#include "lru_dedup_cache.h"
+#include "../../rlclientlib/example_cache/lru_dedup_cache.h"
 #include "parse_example_external.h"
 #include "test_common.h"
 #include "vw/config/options_cli.h"
diff --git a/include/live_model.h b/include/live_model.h
index 7ece185da..0ec565ee7 100644
--- a/include/live_model.h
+++ b/include/live_model.h
@@ -107,6 +107,16 @@ class live_model
    */
   int init(api_status* status = nullptr);
 
+  /**
+   * @brief Load dedup cache.
+   * Load the dedup cache from the specified file.  This cache is used to
+   * prevent duplicate actions from being sent to the online trainer.
+   * @param action_id Hash of the dedup cache
+   * @param action_str Action string
+   * @return int Return error code.  This will also be returned in the api_status object
+   */
+  int load_action(uint64_t action_id, std::string action_str, api_status* status);
+
   /**
    * @brief Choose an action, given a list of actions, action features and context features. The
    * inference library chooses an action by creating a probability distribution over the actions
diff --git a/include/model_mgmt.h b/include/model_mgmt.h
index 4b381dba7..0b7528f4a 100644
--- a/include/model_mgmt.h
+++ b/include/model_mgmt.h
@@ -74,6 +74,7 @@ class i_model
 {
 public:
   virtual int update(const model_data& data, bool& model_ready, api_status* status = nullptr) = 0;
+  virtual int load_action(uint64_t action_id, std::string action_str, api_status* status = nullptr) = 0;
   virtual int choose_rank(const char* event_id, uint64_t rnd_seed, string_view features, std::vector<int>& action_ids,
       std::vector<float>& action_pdf, std::string& model_version, api_status* status = nullptr) = 0;
   virtual int choose_continuous_action(string_view features, float& action, float& pdf_value,
diff --git a/rlclientlib/CMakeLists.txt b/rlclientlib/CMakeLists.txt
index f2a58afb7..3c53068cc 100644
--- a/rlclientlib/CMakeLists.txt
+++ b/rlclientlib/CMakeLists.txt
@@ -55,6 +55,7 @@ set(PROJECT_SOURCES
   decision_response.cc
   dedup.cc
   error_callback_fn.cc
+  example_cache/lru_dedup_cache.cc
   factory_resolver.cc
   generic_event.cc
   learning_mode.cc
@@ -142,6 +143,7 @@ set(PROJECT_PUBLIC_HEADERS
 set(PROJECT_PRIVATE_HEADERS
   console_tracer.h
   dedup.h
+  example_cache/lru_dedup_cache.h
   federation/federated_client.h
   federation/joined_log_provider.h
   generic_event.h
@@ -211,6 +213,7 @@ target_include_directories(rlclientlib
     ${CMAKE_CURRENT_SOURCE_DIR}/../include
   PRIVATE
     ${CMAKE_CURRENT_SOURCE_DIR}
+    ${CMAKE_CURRENT_SOURCE_DIR}/example_cache
     ${CMAKE_CURRENT_SOURCE_DIR}/../ext_libs/date
 )
 
diff --git a/external_parser/lru_dedup_cache.cc b/rlclientlib/example_cache/lru_dedup_cache.cc
similarity index 100%
rename from external_parser/lru_dedup_cache.cc
rename to rlclientlib/example_cache/lru_dedup_cache.cc
diff --git a/external_parser/lru_dedup_cache.h b/rlclientlib/example_cache/lru_dedup_cache.h
similarity index 100%
rename from external_parser/lru_dedup_cache.h
rename to rlclientlib/example_cache/lru_dedup_cache.h
diff --git a/rlclientlib/extensions/onnx/src/onnx_model.cc b/rlclientlib/extensions/onnx/src/onnx_model.cc
index 7d4241941..16f548a85 100644
--- a/rlclientlib/extensions/onnx/src/onnx_model.cc
+++ b/rlclientlib/extensions/onnx/src/onnx_model.cc
@@ -138,6 +138,9 @@ int onnx_model::update(const model_management::model_data& data, bool& model_rea
   return error_code::success;
 }
 
+// TODO: Implement LRU cache for ONNX models.
+int onnx_model::load_action(uint64_t, std::string, api_status*) { return error_code::not_supported; }
+
 int onnx_model::choose_rank(const char* event_id, uint64_t rnd_seed, string_view features, std::vector<int>& action_ids,
     std::vector<float>& action_pdf, std::string& model_version, api_status* status)
 {
diff --git a/rlclientlib/extensions/onnx/src/onnx_model.h b/rlclientlib/extensions/onnx/src/onnx_model.h
index d57aa943a..08bf1f805 100644
--- a/rlclientlib/extensions/onnx/src/onnx_model.h
+++ b/rlclientlib/extensions/onnx/src/onnx_model.h
@@ -20,6 +20,7 @@ class onnx_model : public model_management::i_model
 public:
   onnx_model(i_trace* trace_logger, const char* app_id, const char* output_name, bool use_unstructured_input);
   int update(const model_management::model_data& data, bool& model_ready, api_status* status = nullptr) override;
+  int load_action(uint64_t action_id, std::string action_str, api_status* status = nullptr) override;
   int choose_rank(const char* event_id, uint64_t rnd_seed, string_view features, std::vector<int>& action_ids,
       std::vector<float>& action_pdf, std::string& model_version, api_status* status = nullptr) override;
 
diff --git a/rlclientlib/live_model.cc b/rlclientlib/live_model.cc
index ab4776764..e15b39548 100644
--- a/rlclientlib/live_model.cc
+++ b/rlclientlib/live_model.cc
@@ -61,6 +61,12 @@ std::vector<int> live_model::c_array_to_vector(const int* c_array, size_t array_
   return std::vector<int>(c_array, c_array + array_size);
 }
 
+int live_model::load_action(uint64_t action_id, std::string action_str, api_status* status)
+{
+  INIT_CHECK();
+  return _pimpl->load_action(action_id, std::move(action_str), status);
+}
+
 int live_model::choose_rank(
     const char* event_id, string_view context_json, ranking_response& response, api_status* status)
 {
diff --git a/rlclientlib/live_model_impl.cc b/rlclientlib/live_model_impl.cc
index ebd1c8c22..681edad3e 100644
--- a/rlclientlib/live_model_impl.cc
+++ b/rlclientlib/live_model_impl.cc
@@ -74,6 +74,11 @@ int live_model_impl::init(api_status* status)
   return error_code::success;
 }
 
+int live_model_impl::load_action(uint64_t action_id, std::string action_str, api_status* status)
+{
+  return _model->load_action(action_id, std::move(action_str), status);
+}
+
 int live_model_impl::choose_rank(
     const char* event_id, string_view context, unsigned int flags, ranking_response& response, api_status* status)
 {
diff --git a/rlclientlib/live_model_impl.h b/rlclientlib/live_model_impl.h
index 8a5a0f237..6bce84b16 100644
--- a/rlclientlib/live_model_impl.h
+++ b/rlclientlib/live_model_impl.h
@@ -28,6 +28,7 @@ class live_model_impl
 
   int init(api_status* status);
 
+  int load_action(uint64_t action_id, std::string action_str, api_status* status);
   int choose_rank(
       const char* event_id, string_view context, unsigned int flags, ranking_response& response, api_status* status);
   // here the event_id is auto-generated
diff --git a/rlclientlib/vw_model/pdf_model.cc b/rlclientlib/vw_model/pdf_model.cc
index 8c08da0b5..f1ed8c44a 100644
--- a/rlclientlib/vw_model/pdf_model.cc
+++ b/rlclientlib/vw_model/pdf_model.cc
@@ -23,6 +23,9 @@ int pdf_model::update(const model_data& data, bool& model_ready, api_status* sta
   return error_code::success;
 }
 
+// TODO: Implement LRU cache for PDF models.
+int pdf_model::load_action(uint64_t, std::string, api_status*) { return error_code::not_supported; }
+
 int pdf_model::choose_rank(const char* event_id, uint64_t rnd_seed, string_view features, std::vector<int>& action_ids,
     std::vector<float>& action_pdf, std::string& model_version, api_status* status)
 {
diff --git a/rlclientlib/vw_model/pdf_model.h b/rlclientlib/vw_model/pdf_model.h
index 883e1fbee..77bdac3a5 100644
--- a/rlclientlib/vw_model/pdf_model.h
+++ b/rlclientlib/vw_model/pdf_model.h
@@ -20,6 +20,7 @@ class pdf_model : public i_model
 public:
   pdf_model(i_trace* trace_logger, const utility::configuration& config);
   int update(const model_data& data, bool& model_ready, api_status* status = nullptr) override;
+  int load_action(uint64_t action_id, std::string action_str, api_status* status = nullptr) override;
   int choose_rank(const char* event_id, uint64_t rnd_seed, string_view features, std::vector<int>& action_ids,
       std::vector<float>& action_pdf, std::string& model_version, api_status* status = nullptr) override;
   int choose_continuous_action(string_view features, float& action, float& pdf_value, std::string& model_version,
diff --git a/rlclientlib/vw_model/safe_vw.cc b/rlclientlib/vw_model/safe_vw.cc
index 93db5e62b..92e9262c7 100644
--- a/rlclientlib/vw_model/safe_vw.cc
+++ b/rlclientlib/vw_model/safe_vw.cc
@@ -120,7 +120,28 @@ void safe_vw::parse_context_with_pdf(string_view context, std::vector<int>& acti
   for (auto&& ex : examples) { _example_pool.emplace_back(ex); }
 }
 
-void safe_vw::rank(string_view context, std::vector<int>& actions, std::vector<float>& scores)
+void safe_vw::load_action(uint64_t action_id, std::string action_str, lru_dedup_cache* action_cache)
+{
+  VW::multi_ex examples;
+  examples.push_back(get_or_create_example());
+
+  if (_vw->audit)
+  {
+    _vw->audit_buffer->clear();
+    VW::read_line_json_s<true>(*_vw, examples, &action_str[0], action_str.size(), get_or_create_example_f, this);
+  }
+  else
+  {
+    VW::read_line_json_s<false>(*_vw, examples, &action_str[0], action_str.size(), get_or_create_example_f, this);
+  }
+  action_cache->add(action_id, examples[0]);
+
+  // clean up examples and push examples back into pool for re-use
+  for (auto&& ex : examples) { _example_pool.emplace_back(ex); }
+}
+
+void safe_vw::rank(
+    string_view context, std::vector<int>& actions, std::vector<float>& scores, lru_dedup_cache* action_cache)
 {
   VW::multi_ex examples;
   examples.push_back(get_or_create_example());
@@ -128,12 +149,19 @@ void safe_vw::rank(string_view context, std::vector<int>& actions, std::vector<f
   // copy due to destructive parsing by rapidjson
   std::string line_vec(context);
 
+  auto* action_dict = (action_cache == nullptr) ? nullptr : &action_cache->dedup_examples;
+  // check for null
   if (_vw->audit)
   {
     _vw->audit_buffer->clear();
-    VW::read_line_json_s<true>(*_vw, examples, &line_vec[0], line_vec.size(), get_or_create_example_f, this);
+    VW::read_line_json_s<true>(
+        *_vw, examples, &line_vec[0], line_vec.size(), get_or_create_example_f, this, action_dict);
+  }
+  else
+  {
+    VW::read_line_json_s<false>(
+        *_vw, examples, &line_vec[0], line_vec.size(), get_or_create_example_f, this, action_dict);
   }
-  else { VW::read_line_json_s<false>(*_vw, examples, &line_vec[0], line_vec.size(), get_or_create_example_f, this); }
 
   // finalize example
   VW::setup_examples(*_vw, examples);
diff --git a/rlclientlib/vw_model/safe_vw.h b/rlclientlib/vw_model/safe_vw.h
index c97b4b064..0405a8994 100644
--- a/rlclientlib/vw_model/safe_vw.h
+++ b/rlclientlib/vw_model/safe_vw.h
@@ -1,5 +1,6 @@
 #pragma once
 
+#include "lru_dedup_cache.h"
 #include "model_mgmt.h"
 #include "vw/core/vw.h"
 
@@ -27,7 +28,9 @@ class safe_vw
   ~safe_vw();
 
   void parse_context_with_pdf(string_view context, std::vector<int>& actions, std::vector<float>& scores);
-  void rank(string_view context, std::vector<int>& actions, std::vector<float>& scores);
+  void load_action(uint64_t action_id, std::string action_str, lru_dedup_cache* action_cache);
+  void rank(string_view context, std::vector<int>& actions, std::vector<float>& scores,
+      lru_dedup_cache* action_cache = nullptr);
   void choose_continuous_action(string_view context, float& action, float& pdf_value);
   // Used for CCB
   void rank_decisions(const std::vector<const char*>& event_ids, string_view context,
diff --git a/rlclientlib/vw_model/vw_model.cc b/rlclientlib/vw_model/vw_model.cc
index 53d951a93..3a2e818c4 100644
--- a/rlclientlib/vw_model/vw_model.cc
+++ b/rlclientlib/vw_model/vw_model.cc
@@ -67,6 +67,14 @@ int vw_model::update(const model_data& data, bool& model_ready, api_status* stat
   return error_code::success;
 }
 
+int vw_model::load_action(uint64_t action_id, std::string action_str, api_status* status)
+{
+  std::lock_guard<std::mutex> lock(_mutex);
+  auto vw = _vw_pool.get_or_create();
+  vw->load_action(action_id, action_str, &_action_cache);
+  return error_code::success;
+}
+
 int vw_model::choose_rank(const char* event_id, uint64_t rnd_seed, string_view features, std::vector<int>& action_ids,
     std::vector<float>& action_pdf, std::string& model_version, api_status* status)
 {
@@ -75,7 +83,8 @@ int vw_model::choose_rank(const char* event_id, uint64_t rnd_seed, string_view f
     auto vw = _vw_pool.get_or_create();
 
     // Get a ranked list of action_ids and corresponding pdf
-    vw->rank(features, action_ids, action_pdf);
+    std::lock_guard<std::mutex> lock(_mutex);
+    vw->rank(features, action_ids, action_pdf, &_action_cache);
 
     if (_audit) { write_audit_log(event_id, vw->get_audit_data()); }
 
@@ -97,6 +106,7 @@ int vw_model::choose_rank_multistep(const char* event_id, uint64_t rnd_seed, str
     const episode_history& history, std::vector<int>& action_ids, std::vector<float>& action_pdf,
     std::string& model_version, api_status* status)
 {
+  std::lock_guard<std::mutex> lock(_mutex);
   return choose_rank(event_id, rnd_seed, features, action_ids, action_pdf, model_version, status);
 }
 
@@ -132,6 +142,7 @@ int vw_model::request_decision(const std::vector<const char*>& event_ids, string
     auto vw = _vw_pool.get_or_create();
 
     // Get a ranked list of action_ids and corresponding pdf
+    std::lock_guard<std::mutex> lock(_mutex);
     vw->rank_decisions(event_ids, features, actions_ids, action_pdfs);
 
     model_version = vw->id();
diff --git a/rlclientlib/vw_model/vw_model.h b/rlclientlib/vw_model/vw_model.h
index dd872b6e9..68f8772f1 100644
--- a/rlclientlib/vw_model/vw_model.h
+++ b/rlclientlib/vw_model/vw_model.h
@@ -1,10 +1,13 @@
 #pragma once
 #include "../utility/versioned_object_pool.h"
+#include "lru_dedup_cache.h"
 #include "model_mgmt.h"
 #include "multistep.h"
 #include "safe_vw.h"
 #include "trace_logger.h"
 
+#include <mutex>
+
 namespace reinforcement_learning
 {
 namespace utility
@@ -26,6 +29,7 @@ class vw_model : public i_model
   vw_model(i_trace* trace_logger, const utility::configuration& config);
 
   int update(const model_data& data, bool& model_ready, api_status* status = nullptr) override;
+  int load_action(uint64_t action_id, std::string action_str, api_status* status = nullptr) override;
   int choose_rank(const char* event_id, uint64_t rnd_seed, string_view features, std::vector<int>& action_ids,
       std::vector<float>& action_pdf, std::string& model_version, api_status* status = nullptr) override;
   int choose_continuous_action(string_view features, float& action, float& pdf_value, std::string& model_version,
@@ -48,6 +52,8 @@ class vw_model : public i_model
   const std::string _quiet_commandline_options{"--json --quiet"};
   const std::string _upgrade_to_CCB_vw_commandline_options{"--ccb_explore_adf --json --quiet"};
   utility::versioned_object_pool<safe_vw> _vw_pool;
+  lru_dedup_cache _action_cache;
+  std::mutex _mutex;
   i_trace* _trace_logger;
 };
 }  // namespace model_management
diff --git a/unit_test/live_model_test.cc b/unit_test/live_model_test.cc
index 83de9cd1a..fdcd05aa0 100644
--- a/unit_test/live_model_test.cc
+++ b/unit_test/live_model_test.cc
@@ -448,7 +448,7 @@ BOOST_AUTO_TEST_CASE(live_model_ranking_request_check_response_pdf_explore_only)
   r::ranking_response response;
 
   const auto JSON_CB_CONTEXT_3ACTIONS =
-      R"({"GUser":{"id":"a","major":"eng","hobby":"hiking"},"_multi":[{"TAction":{"a1":"f1"} },{"TAction":{"a2":"f2"}},{"TAction":{"a3":"f3"}}]})";
+      R"({"GUser":{"id":"a","major":"eng","hobby":"hiking"},"_multi":[{"TAction":{"a1":"f1"}},{"TAction":{"a2":"f2"}},{"TAction":{"a3":"f3"}}]})";
 
   // request ranking
   BOOST_CHECK_EQUAL(model.choose_rank(event_id, JSON_CB_CONTEXT_3ACTIONS, response), err::success);
@@ -468,6 +468,54 @@ BOOST_AUTO_TEST_CASE(live_model_ranking_request_check_response_pdf_explore_only)
   }
 }
 
+BOOST_AUTO_TEST_CASE(live_model_ranking_request_check_response_pdf_explore_only_dedup)
+{
+  // create a simple ds configuration
+  u::configuration config;
+  cfg::create_from_json(JSON_CFG, config);
+  config.set(r::name::EH_TEST, "true");
+  config.set(r::name::MODEL_SRC, r::value::NO_MODEL_DATA);
+  config.set(r::name::OBSERVATION_SENDER_IMPLEMENTATION, r::value::OBSERVATION_FILE_SENDER);
+  config.set(r::name::INTERACTION_SENDER_IMPLEMENTATION, r::value::INTERACTION_FILE_SENDER);
+  config.set(
+      r::name::MODEL_VW_INITIAL_COMMAND_LINE, "--cb_explore_adf --json --quiet --epsilon 0.3 --first_only --id N/A");
+
+  r::api_status status;
+
+  // create the ds live_model, and initialize it with the config
+  r::live_model model(config);
+
+  BOOST_CHECK_EQUAL(model.init(&status), err::success);
+  const auto event_id = "event_id";
+
+  r::ranking_response response;
+
+  const auto JSON_CB_CONTEXT_3ACTIONS_DEDUP =
+      R"({"GUser":{"id":"a","major":"eng","hobby":"hiking"},"_multi":[{"__aid":1},{"__aid":2},{"__aid":3}]})";
+
+  // add dedup
+  BOOST_CHECK_EQUAL(model.load_action(1, "{\"TAction\":{\"a1\":\"f1\"}}", &status), err::success);
+  BOOST_CHECK_EQUAL(model.load_action(2, "{\"TAction\":{\"a2\":\"f2\"}}", &status), err::success);
+  BOOST_CHECK_EQUAL(model.load_action(3, "{\"TAction\":{\"a3\":\"f3\"}}", &status), err::success);
+
+  // request ranking
+  BOOST_CHECK_EQUAL(model.choose_rank(event_id, JSON_CB_CONTEXT_3ACTIONS_DEDUP, response), err::success);
+
+  size_t num_actions = response.size();
+  BOOST_CHECK_EQUAL(num_actions, 3);
+
+  const float EXPECTED_PROBS[3] = {0.8f, 0.1f, 0.1f};
+
+  // check that our PDF is what we expected
+  r::ranking_response::iterator it = response.begin();
+
+  for (uint32_t i = 0; i < num_actions; i++)
+  {
+    auto action_probability = *(it + i);
+    BOOST_CHECK_CLOSE(action_probability.probability, EXPECTED_PROBS[action_probability.action_id], FLOAT_TOL);
+  }
+}
+
 BOOST_AUTO_TEST_CASE(live_model_ranking_w_las_request_check_response_pdf_explore_only)
 {
   // create a simple ds configuration