diff --git a/benchmark/c/main.cpp b/benchmark/c/main.cpp
index 2d4b62b1f..3a4c9b43b 100644
--- a/benchmark/c/main.cpp
+++ b/benchmark/c/main.cpp
@@ -112,7 +112,7 @@ void WriteE2EStats(std::string_view label,
             << "\n";
 }
 
-std::string GeneratePrompt(size_t num_prompt_tokens, OgaModel& model, const OgaTokenizer& tokenizer) {
+std::string GeneratePrompt(size_t num_prompt_tokens, const OgaModel& model, const OgaTokenizer& tokenizer) {
   const char* const base_prompt = "A";
   auto base_prompt_sequences = OgaSequences::Create();
 
diff --git a/src/csharp/NativeMethods.cs b/src/csharp/NativeMethods.cs
index f2906f3df..a56e7dd7e 100644
--- a/src/csharp/NativeMethods.cs
+++ b/src/csharp/NativeMethods.cs
@@ -71,7 +71,7 @@ internal class NativeLib
                                                                                          IntPtr /* const OgaSequences* */ sequences);
 
         [DllImport(NativeLib.DllName, CallingConvention = CallingConvention.Winapi)]
-        public static extern IntPtr /* OgaResult* */ OgaCreateGenerator(IntPtr /* OgaModel* */ model,
+        public static extern IntPtr /* OgaResult* */ OgaCreateGenerator(IntPtr /* const OgaModel* */ model,
                                                                         IntPtr /* const OgaGeneratorParams* */ generatorParams,
                                                                         out IntPtr /* OgaGenerator** */ generator);
 
@@ -129,7 +129,7 @@ public static extern UIntPtr OgaSequencesGetSequenceCount(IntPtr /* const OgaSeq
         // This function is used to generate sequences for the given model using the given generator parameters.
         // The OgaSequences object is an array of sequences, where each sequence is an array of tokens.
         [DllImport(NativeLib.DllName, CallingConvention = CallingConvention.Winapi)]
-        public static extern IntPtr /* OgaResult* */ OgaGenerate(IntPtr /* OgaModel* */ model,
+        public static extern IntPtr /* OgaResult* */ OgaGenerate(IntPtr /* const OgaModel* */ model,
                                                                  IntPtr /* const OgaGeneratorParams* */ generatorParams,
                                                                  out IntPtr /* OgaSequences** */ sequences);
 
diff --git a/src/generators.cpp b/src/generators.cpp
index 0c664f341..bc00f8d3e 100644
--- a/src/generators.cpp
+++ b/src/generators.cpp
@@ -61,7 +61,25 @@ GeneratorParams::GeneratorParams(const Model& model)
       eos_token_id{model.config_->model.eos_token_id},
       vocab_size{model.config_->model.vocab_size},
       device_type{model.device_type_},
-      cuda_stream{model.cuda_stream_} {
+      cuda_stream{model.cuda_stream_},
+      is_cuda_graph_enabled_{IsCudaGraphEnabled(model.config_->model.decoder.session_options)} {
+}
+
+void GeneratorParams::TryGraphCapture(int max_bs) {
+  if (!is_cuda_graph_enabled_ || device_type == DeviceType::CPU) {
+    // no-op
+    return;
+  }
+
+  if (DeviceType::CUDA == device_type || DeviceType::DML == device_type) {
+    if (max_bs == 0) {
+      throw std::runtime_error("Graph capture is enabled, but max_batch_size is not set.");
+    }
+    use_cuda_graph = true;
+    max_batch_size = max_bs;
+  } else {
+    throw std::runtime_error("CUDA graph is not supported on this device");
+  }
 }
 
 std::unique_ptr<Generator> CreateGenerator(const Model& model, const GeneratorParams& params) {
diff --git a/src/generators.h b/src/generators.h
index c10868570..c6a510739 100644
--- a/src/generators.h
+++ b/src/generators.h
@@ -61,6 +61,7 @@ struct GeneratorParams : std::enable_shared_from_this<GeneratorParams> {
 
   int batch_size{1};
   int max_batch_size{0};
+  bool use_cuda_graph{};
   int sequence_length{};
   int BatchBeamSize() const { return search.num_beams * batch_size; }
 
@@ -97,6 +98,11 @@ struct GeneratorParams : std::enable_shared_from_this<GeneratorParams> {
   std::vector<int32_t> input_ids_owner;  // Backing memory of input_ids in some cases
 
   std::shared_ptr<GeneratorParams> external_owner_;  // Set to 'this' when created by the C API to preserve lifetime
+
+  void TryGraphCapture(int max_bs);
+
+ private:
+  bool is_cuda_graph_enabled_{};
 };
 
 struct Generator {
diff --git a/src/models/captured_graph_pool.cpp b/src/models/captured_graph_pool.cpp
index 140f2a8cd..96cc029b8 100644
--- a/src/models/captured_graph_pool.cpp
+++ b/src/models/captured_graph_pool.cpp
@@ -24,7 +24,7 @@ static std::tuple<int, int, int> MakeKey(int max_batch_size, int max_length, int
 }
 
 CapturedGraphInfoPtr CapturedGraphPool::ReserveCapturedGraph(const Model& model, const GeneratorParams& params) const {
-  if (!model.use_cuda_graph_ || (model.device_type_ != DeviceType::CUDA && model.device_type_ != DeviceType::DML)) {
+  if (!params.use_cuda_graph || (model.device_type_ != DeviceType::CUDA && model.device_type_ != DeviceType::DML)) {
     return nullptr;
   }
 
diff --git a/src/models/decoder_only.cpp b/src/models/decoder_only.cpp
index 83d1f03d3..53f4f6697 100644
--- a/src/models/decoder_only.cpp
+++ b/src/models/decoder_only.cpp
@@ -26,7 +26,7 @@ DecoderOnly_State::DecoderOnly_State(const DecoderOnly_Model& model, RoamingArra
 
 RoamingArray<float> DecoderOnly_State::Run(int current_length, RoamingArray<int32_t> next_tokens, RoamingArray<int32_t> next_indices) {
   if (first_run_) {
-    if (model_.use_cuda_graph_) {
+    if (params_->use_cuda_graph) {
       model_.run_options_->AddConfigEntry("gpu_graph_id", "-1");
     }
     first_run_ = false;
@@ -37,7 +37,7 @@ RoamingArray<float> DecoderOnly_State::Run(int current_length, RoamingArray<int3
   State::Run(*model_.session_decoder_, *model_.run_options_);
 
   // Set the graph id for the following runs.
-  if (model_.use_cuda_graph_) {
+  if (params_->use_cuda_graph) {
     int new_batch_size = static_cast<int>(input_ids_.GetShape()[0]);
     if (new_batch_size != current_batch_size_) {
       current_batch_size_ = new_batch_size;
diff --git a/src/models/model.cpp b/src/models/model.cpp
index 4e7aa7343..e0a138ae2 100644
--- a/src/models/model.cpp
+++ b/src/models/model.cpp
@@ -537,26 +537,4 @@ std::unique_ptr<OrtValue> Model::ExpandInputs(std::unique_ptr<OrtValue>& input,
   return expanded;
 }
 
-void Model::GetMaxBatchSizeFromGeneratorParams(const GeneratorParams& params) {
-  bool is_cuda_graph_enabled = device_type_ == DeviceType::DML || IsCudaGraphEnabled(config_->model.decoder.session_options);
-  max_batch_size_ = params.max_batch_size;
-
-  if (DeviceType::CUDA == device_type_) {
-    if (is_cuda_graph_enabled) {
-      if (max_batch_size_ == 0) {
-        throw std::runtime_error("CUDA graph is enabled, but max_batch_size is not set.");
-      }
-      use_cuda_graph_ = true;
-    }
-  } else if (DeviceType::DML == device_type_) {
-    if (max_batch_size_ == 0) {
-      throw std::runtime_error("max_batch_size needs to be set when using DirectML.");
-    }
-
-    use_cuda_graph_ = true;
-  } else if (is_cuda_graph_enabled) {
-    throw std::runtime_error("CUDA graph is not supported on this device");
-  }
-}
-
 }  // namespace Generators
diff --git a/src/models/model.h b/src/models/model.h
index b569373f8..d1b0a1ec0 100644
--- a/src/models/model.h
+++ b/src/models/model.h
@@ -119,8 +119,6 @@ struct Model : std::enable_shared_from_this<Model> {
 
   std::unique_ptr<OrtValue> ExpandInputs(std::unique_ptr<OrtValue>& input, int num_beams) const;
 
-  void GetMaxBatchSizeFromGeneratorParams(const GeneratorParams& params);
-
   CapturedGraphPool* GetCapturedGraphPool() const { return captured_graph_pool_.get(); }
 
   std::unique_ptr<Config> config_;
@@ -136,9 +134,6 @@ struct Model : std::enable_shared_from_this<Model> {
 
   std::shared_ptr<Model> external_owner_;  // Set to 'this' when created by the C API to preserve lifetime
 
-  bool use_cuda_graph_{};
-  int max_batch_size_{};
-
 #if USE_DML
   DmlExecutionContext* GetDmlExecutionContext() const { return dml_execution_context_.get(); }
   DmlReadbackHeap* GetDmlReadbackHeap() const { return dml_readback_heap_.get(); }
diff --git a/src/ort_genai.h b/src/ort_genai.h
index fb863dae2..b8e55bf19 100644
--- a/src/ort_genai.h
+++ b/src/ort_genai.h
@@ -75,7 +75,7 @@ struct OgaModel : OgaAbstract {
     return std::unique_ptr<OgaModel>(p);
   }
 
-  std::unique_ptr<OgaSequences> Generate(const OgaGeneratorParams& params) {
+  std::unique_ptr<OgaSequences> Generate(const OgaGeneratorParams& params) const {
     OgaSequences* p;
     OgaCheckResult(OgaGenerate(this, &params, &p));
     return std::unique_ptr<OgaSequences>(p);
@@ -201,7 +201,7 @@ struct OgaGeneratorParams : OgaAbstract {
 };
 
 struct OgaGenerator : OgaAbstract {
-  static std::unique_ptr<OgaGenerator> Create(OgaModel& model, const OgaGeneratorParams& params) {
+  static std::unique_ptr<OgaGenerator> Create(const OgaModel& model, const OgaGeneratorParams& params) {
     OgaGenerator* p;
     OgaCheckResult(OgaCreateGenerator(&model, &params, &p));
     return std::unique_ptr<OgaGenerator>(p);
diff --git a/src/ort_genai_c.cpp b/src/ort_genai_c.cpp
index 13cae5235..d5ab67040 100644
--- a/src/ort_genai_c.cpp
+++ b/src/ort_genai_c.cpp
@@ -108,7 +108,7 @@ OgaResult* OGA_API_CALL OgaGeneratorParamsSetSearchBool(OgaGeneratorParams* gene
 OgaResult* OGA_API_CALL OgaGeneratorParamsTryGraphCaptureWithMaxBatchSize(OgaGeneratorParams* generator_params, int32_t max_batch_size) {
   OGA_TRY
   auto* params = reinterpret_cast<Generators::GeneratorParams*>(generator_params);
-  params->max_batch_size = max_batch_size;
+  params->TryGraphCapture(max_batch_size);
   return nullptr;
   OGA_CATCH
 }
@@ -143,23 +143,17 @@ OGA_EXPORT OgaResult* OGA_API_CALL OgaGeneratorParamsSetInputSequences(OgaGenera
   OGA_CATCH
 }
 
-OgaResult* OGA_API_CALL OgaGenerate(OgaModel* model, const OgaGeneratorParams* generator_params, OgaSequences** out) {
+OgaResult* OGA_API_CALL OgaGenerate(const OgaModel* model, const OgaGeneratorParams* generator_params, OgaSequences** out) {
   OGA_TRY
-  auto* model_p = reinterpret_cast<Generators::Model*>(model);
-  auto* params = reinterpret_cast<const Generators::GeneratorParams*>(generator_params);
-  model_p->GetMaxBatchSizeFromGeneratorParams(*params);
-  auto result = Generators::Generate(*model_p, *params);
+  auto result = Generators::Generate(*reinterpret_cast<const Generators::Model*>(model), *reinterpret_cast<const Generators::GeneratorParams*>(generator_params));
   *out = reinterpret_cast<OgaSequences*>(std::make_unique<Generators::TokenSequences>(std::move(result)).release());
   return nullptr;
   OGA_CATCH
 }
 
-OgaResult* OgaCreateGenerator(OgaModel* model, const OgaGeneratorParams* generator_params, OgaGenerator** out) {
+OgaResult* OgaCreateGenerator(const OgaModel* model, const OgaGeneratorParams* generator_params, OgaGenerator** out) {
   OGA_TRY
-  auto* model_p = reinterpret_cast<Generators::Model*>(model);
-  auto* params = reinterpret_cast<const Generators::GeneratorParams*>(generator_params);
-  model_p->GetMaxBatchSizeFromGeneratorParams(*params);
-  *out = reinterpret_cast<OgaGenerator*>(CreateGenerator(*model_p, *params).release());
+  *out = reinterpret_cast<OgaGenerator*>(CreateGenerator(*reinterpret_cast<const Generators::Model*>(model), *reinterpret_cast<const Generators::GeneratorParams*>(generator_params)).release());
   return nullptr;
   OGA_CATCH
 }
diff --git a/src/ort_genai_c.h b/src/ort_genai_c.h
index 0939d2c36..3e44c29e4 100644
--- a/src/ort_genai_c.h
+++ b/src/ort_genai_c.h
@@ -117,7 +117,7 @@ OGA_EXPORT void OGA_API_CALL OgaDestroyModel(OgaModel* model);
  *             after it is done using the sequences.
  * \return OgaResult containing the error message if the generation failed.
  */
-OGA_EXPORT OgaResult* OGA_API_CALL OgaGenerate(OgaModel* model, const OgaGeneratorParams* generator_params, OgaSequences** out);
+OGA_EXPORT OgaResult* OGA_API_CALL OgaGenerate(const OgaModel* model, const OgaGeneratorParams* generator_params, OgaSequences** out);
 
 /*
  * \brief Creates a OgaGeneratorParams from the given model.
@@ -167,7 +167,7 @@ OGA_EXPORT OgaResult* OGA_API_CALL OgaGeneratorParamsSetWhisperDecoderInputIDs(O
  * \param[out] out The created generator.
  * \return OgaResult containing the error message if the generator creation failed.
  */
-OGA_EXPORT OgaResult* OGA_API_CALL OgaCreateGenerator(OgaModel* model, const OgaGeneratorParams* params, OgaGenerator** out);
+OGA_EXPORT OgaResult* OGA_API_CALL OgaCreateGenerator(const OgaModel* model, const OgaGeneratorParams* params, OgaGenerator** out);
 
 /*
  * \brief Destroys the given generator.
diff --git a/src/python/python.cpp b/src/python/python.cpp
index cd974d916..1d8a4e567 100644
--- a/src/python/python.cpp
+++ b/src/python/python.cpp
@@ -104,7 +104,7 @@ struct PyGeneratorParams {
   }
 
   void TryUseCudaGraphWithMaxBatchSize(pybind11::int_ max_batch_size) {
-    params_->max_batch_size = max_batch_size.cast<int>();
+    params_->TryGraphCapture(max_batch_size.cast<int>());
   }
 
   pybind11::array_t<int32_t> py_input_ids_;
@@ -115,7 +115,6 @@ struct PyGeneratorParams {
 struct PyGenerator {
   PyGenerator(Model& model, PyGeneratorParams& params) {
     params.Prepare();
-    model.GetMaxBatchSizeFromGeneratorParams(params);
     generator_ = CreateGenerator(model, params);
   }
 
@@ -229,7 +228,7 @@ PYBIND11_MODULE(onnxruntime_genai, m) {
       .def(pybind11::init([](const std::string& config_path) {
         return CreateModel(GetOrtEnv(), config_path.c_str());
       }))
-      .def("generate", [](Model& model, PyGeneratorParams& params) { params.Prepare(); model.GetMaxBatchSizeFromGeneratorParams(params); return Generate(model, params); })
+      .def("generate", [](Model& model, PyGeneratorParams& params) { params.Prepare(); return Generate(model, params); })
       .def_property_readonly("device_type", [](const Model& s) { return s.device_type_; });
 
   pybind11::class_<PyGenerator>(m, "Generator")