diff --git a/src/models/llm/llm_datatype.hpp b/src/models/llm/llm_datatype.hpp
index 9033b59..7223686 100644
--- a/src/models/llm/llm_datatype.hpp
+++ b/src/models/llm/llm_datatype.hpp
@@ -23,6 +23,11 @@ struct ModelStatus {
     int32_t embed_dims;
 };
 
+struct ChatMessage {
+    std::string role;
+    std::string content;
+};
+
 class Dialog {
   public:
     /***
@@ -52,7 +57,7 @@ class Dialog {
      *
      * @param msg
      */
-    explicit Dialog(const llama_chat_message &msg) { messages.push_back(msg); }
+    explicit Dialog(const ChatMessage &msg) { messages.push_back(msg); }
 
     /***
      *
@@ -60,7 +65,7 @@ class Dialog {
      * @param content
      */
     Dialog(const std::string &role, const std::string &content) {
-        llama_chat_message msg = {role.c_str(), content.c_str()};
+        ChatMessage msg = {role, content};
         messages.push_back(msg);
     }
 
@@ -70,7 +75,7 @@ class Dialog {
      * @param content
      */
     Dialog(const char* role, const char* content) {
-        llama_chat_message msg = {role, content};
+        ChatMessage msg = {role, content};
         messages.push_back(msg);
     }
 
@@ -100,13 +105,13 @@ class Dialog {
      * @param index
      * @return
      */
-    inline llama_chat_message &operator[](size_t index) { return messages[index]; }
+    inline ChatMessage &operator[](size_t index) { return messages[index]; }
 
     /***
      *
      * @param msg
      */
-    inline void push_back(const llama_chat_message &msg) { messages.push_back(msg); }
+    inline void push_back(const ChatMessage &msg) { messages.push_back(msg); }
 
     /***
      *
@@ -126,9 +131,75 @@ class Dialog {
     inline size_t size() const { return messages.size(); }
 
   public:
-    std::vector<llama_chat_message> messages;
+    std::vector<ChatMessage> messages;
+};
+
+namespace llama {
+
+enum common_sampler_type {
+    COMMON_SAMPLER_TYPE_NONE        = 0,
+    COMMON_SAMPLER_TYPE_DRY         = 1,
+    COMMON_SAMPLER_TYPE_TOP_K       = 2,
+    COMMON_SAMPLER_TYPE_TOP_P       = 3,
+    COMMON_SAMPLER_TYPE_MIN_P       = 4,
+    //COMMON_SAMPLER_TYPE_TFS_Z       = 5,
+    COMMON_SAMPLER_TYPE_TYPICAL_P   = 6,
+    COMMON_SAMPLER_TYPE_TEMPERATURE = 7,
+    COMMON_SAMPLER_TYPE_XTC         = 8,
+    COMMON_SAMPLER_TYPE_INFILL      = 9,
 };
 
+struct common_params_sampling {
+    uint32_t seed = LLAMA_DEFAULT_SEED; // the seed used to initialize llama_sampler
+
+    int32_t n_prev             = 64;    // number of previous tokens to remember
+    int32_t n_probs            = 0;     // if greater than 0, output the probabilities of top n_probs tokens.
+    int32_t min_keep           = 0;     // 0 = disabled, otherwise samplers should return at least min_keep tokens
+    int32_t top_k              = 40;    // <= 0 to use vocab size
+    float   top_p              = 0.95f; // 1.0 = disabled
+    float   min_p              = 0.05f; // 0.0 = disabled
+    float   xtc_probability    = 0.00f; // 0.0 = disabled
+    float   xtc_threshold      = 0.10f; // > 0.5 disables XTC
+    float   typ_p              = 1.00f; // typical_p, 1.0 = disabled
+    float   temp               = 0.80f; // <= 0.0 to sample greedily, 0.0 to not output probabilities
+    float   dynatemp_range     = 0.00f; // 0.0 = disabled
+    float   dynatemp_exponent  = 1.00f; // controls how entropy maps to temperature in dynamic temperature sampler
+    int32_t penalty_last_n     = 64;    // last n tokens to penalize (0 = disable penalty, -1 = context size)
+    float   penalty_repeat     = 1.00f; // 1.0 = disabled
+    float   penalty_freq       = 0.00f; // 0.0 = disabled
+    float   penalty_present    = 0.00f; // 0.0 = disabled
+    float   dry_multiplier     = 0.0f;  // 0.0 = disabled;      DRY repetition penalty for tokens extending repetition:
+    float   dry_base           = 1.75f; // 0.0 = disabled;      multiplier * base ^ (length of sequence before token - allowed length)
+    int32_t dry_allowed_length = 2;     // tokens extending repetitions beyond this receive penalty
+    int32_t dry_penalty_last_n = -1;    // how many tokens to scan for repetitions (0 = disable penalty, -1 = context size)
+    int32_t mirostat           = 0;     // 0 = disabled, 1 = mirostat, 2 = mirostat 2.0
+    float   mirostat_tau       = 5.00f; // target entropy
+    float   mirostat_eta       = 0.10f; // learning rate
+    bool    penalize_nl        = false; // consider newlines as a repeatable token
+    bool    ignore_eos         = false;
+    bool    no_perf            = false; // disable performance metrics
+    bool    timing_per_token   = false;
+
+    std::vector<std::string> dry_sequence_breakers = {"\n", ":", "\"", "*"};     // default sequence breakers for DRY
+
+
+    std::vector<enum common_sampler_type> samplers = {
+        COMMON_SAMPLER_TYPE_DRY,
+        COMMON_SAMPLER_TYPE_TOP_K,
+        COMMON_SAMPLER_TYPE_TYPICAL_P,
+        COMMON_SAMPLER_TYPE_TOP_P,
+        COMMON_SAMPLER_TYPE_MIN_P,
+        COMMON_SAMPLER_TYPE_XTC,
+        COMMON_SAMPLER_TYPE_TEMPERATURE,
+    };
+
+    std::string grammar; // optional BNF-like grammar to constrain sampling
+
+    std::vector<llama_logit_bias> logit_bias; // logit biases to apply
+};
+
+}
+
 }
 }
 }