diff --git a/examples/qualcomm/oss_scripts/llama/runner/runner.cpp b/examples/qualcomm/oss_scripts/llama/runner/runner.cpp
index fc4ff006a90..14df30779aa 100644
--- a/examples/qualcomm/oss_scripts/llama/runner/runner.cpp
+++ b/examples/qualcomm/oss_scripts/llama/runner/runner.cpp
@@ -464,6 +464,13 @@ Error Runner<T>::generate_from_prompt_or_file(
   return Error::Ok;
 }
 
+template <typename T>
+::executorch::runtime::Error Runner<T>::prefill(
+    const std::string& prompt,
+    const executorch::extension::llm::GenerationConfig& config) {
+  return ::Error::NotImplemented;
+}
+
 template <typename T>
 Result<DecoderModelVersion> Runner<T>::get_decoder_model_version() {
   if (!is_loaded()) {
diff --git a/examples/qualcomm/oss_scripts/llama/runner/runner.h b/examples/qualcomm/oss_scripts/llama/runner/runner.h
index 9f290d79c75..41d1ae19bdc 100644
--- a/examples/qualcomm/oss_scripts/llama/runner/runner.h
+++ b/examples/qualcomm/oss_scripts/llama/runner/runner.h
@@ -79,6 +79,10 @@ class Runner : public executorch::extension::llm::IRunner {
       const executorch::extension::llm::GenerationConfig& config,
       std::function<void(const std::string&)> token_callback = {},
       std::function<void(const executorch::llm::Stats&)> stats_callback = {});
+
+  executorch::runtime::Error prefill(
+      const std::string& prompt,
+      const executorch::extension::llm::GenerationConfig& config = {}) override;
   void stop() override {};
   void reset() override {};
   executorch::runtime::Result<DecoderModelVersion> get_decoder_model_version();
diff --git a/extension/android/jni/jni_layer_llama.cpp b/extension/android/jni/jni_layer_llama.cpp
index cabf30c42e4..68b96cb64ff 100644
--- a/extension/android/jni/jni_layer_llama.cpp
+++ b/extension/android/jni/jni_layer_llama.cpp
@@ -123,7 +123,6 @@ class ExecuTorchLlmJni : public facebook::jni::HybridClass<ExecuTorchLlmJni> {
   std::unique_ptr<llm::IRunner> runner_;
   std::unique_ptr<executorch::extension::llm::MultimodalRunner>
       multi_modal_runner_;
-  std::vector<llm::MultimodalInput> prefill_inputs_;
 
  public:
   constexpr static auto kJavaDescriptor =
@@ -213,8 +212,7 @@ class ExecuTorchLlmJni : public facebook::jni::HybridClass<ExecuTorchLlmJni> {
       facebook::jni::alias_ref<ExecuTorchLlmCallbackJni> callback,
       jboolean echo) {
     if (model_type_category_ == MODEL_TYPE_CATEGORY_MULTIMODAL) {
-      std::vector<llm::MultimodalInput> inputs = prefill_inputs_;
-      prefill_inputs_.clear();
+      std::vector<llm::MultimodalInput> inputs;
       if (!prompt->toStdString().empty()) {
         inputs.emplace_back(llm::MultimodalInput{prompt->toStdString()});
       }
@@ -245,17 +243,28 @@ class ExecuTorchLlmJni : public facebook::jni::HybridClass<ExecuTorchLlmJni> {
 
   // Returns status_code
   // Contract is valid within an AAR (JNI + corresponding Java code)
-  jint append_text_input(facebook::jni::alias_ref<jstring> prompt) {
-    prefill_inputs_.emplace_back(llm::MultimodalInput{prompt->toStdString()});
-    return 0;
+  jint prefill_text_input(facebook::jni::alias_ref<jstring> prompt) {
+    if (model_type_category_ == MODEL_TYPE_CATEGORY_LLM) {
+      runner_->prefill(prompt->toStdString(), {});
+      return 0;
+    } else if (model_type_category_ == MODEL_TYPE_CATEGORY_MULTIMODAL) {
+      multi_modal_runner_->prefill(
+          {llm::MultimodalInput{prompt->toStdString()}});
+      return 0;
+    }
   }
 
-  // Returns status_code
-  jint append_images_input(
+  jint prefill_images_input(
       facebook::jni::alias_ref<jintArray> image,
       jint width,
       jint height,
       jint channels) {
+    if (model_type_category_ != MODEL_TYPE_CATEGORY_MULTIMODAL) {
+      return static_cast<jint>(Error::InvalidArgument);
+    }
+    if (image == nullptr) {
+      return static_cast<jint>(Error::InvalidArgument);
+    }
     std::vector<llm::Image> images;
     if (image == nullptr) {
       return static_cast<jint>(Error::EndOfMethod);
@@ -269,13 +278,39 @@ class ExecuTorchLlmJni : public facebook::jni::HybridClass<ExecuTorchLlmJni> {
         image_data[i] = image_data_jint[i];
       }
       llm::Image image_runner{std::move(image_data), width, height, channels};
-      prefill_inputs_.emplace_back(
-          llm::MultimodalInput{std::move(image_runner)});
+      multi_modal_runner_->prefill(
+          {llm::MultimodalInput{std::move(image_runner)}});
     }
 
     return 0;
   }
 
+  jint prefill_audio_input(
+      facebook::jni::alias_ref<jintArray> audio,
+      jint batch_size,
+      jint n_channels,
+      jint n_samples) {
+    if (model_type_category_ != MODEL_TYPE_CATEGORY_MULTIMODAL) {
+      return static_cast<jint>(Error::InvalidArgument);
+    }
+    if (audio == nullptr) {
+      return static_cast<jint>(Error::InvalidArgument);
+    }
+    auto audio_size = audio->size();
+    std::vector<uint8_t> audio_data(audio_size);
+    if (audio_size != 0) {
+      std::vector<jint> audio_data_jint(audio_size);
+      audio->getRegion(0, audio_size, audio_data_jint.data());
+      for (int i = 0; i < audio_size; i++) {
+        audio_data[i] = audio_data_jint[i];
+      }
+      llm::RawAudio audio_input{audio_data, batch_size, n_channels, n_samples};
+      multi_modal_runner_->prefill(
+          {llm::MultimodalInput{std::move(audio_input)}});
+    }
+    return 0;
+  }
+
   void stop() {
     if (model_type_category_ == MODEL_TYPE_CATEGORY_MULTIMODAL) {
       multi_modal_runner_->stop();
@@ -309,9 +344,11 @@ class ExecuTorchLlmJni : public facebook::jni::HybridClass<ExecuTorchLlmJni> {
         makeNativeMethod("stop", ExecuTorchLlmJni::stop),
         makeNativeMethod("load", ExecuTorchLlmJni::load),
         makeNativeMethod(
-            "appendImagesInput", ExecuTorchLlmJni::append_images_input),
+            "appendImagesInput", ExecuTorchLlmJni::prefill_images_input),
+        makeNativeMethod(
+            "appendTextInput", ExecuTorchLlmJni::prefill_text_input),
         makeNativeMethod(
-            "appendTextInput", ExecuTorchLlmJni::append_text_input),
+            "appendAudioInput", ExecuTorchLlmJni::prefill_audio_input),
         makeNativeMethod("resetContext", ExecuTorchLlmJni::reset_context),
     });
   }
diff --git a/extension/llm/runner/irunner.h b/extension/llm/runner/irunner.h
index ef93f32319c..6699234be4d 100644
--- a/extension/llm/runner/irunner.h
+++ b/extension/llm/runner/irunner.h
@@ -125,6 +125,17 @@ class ET_EXPERIMENTAL IRunner {
       std::function<void(const std::string&)> token_callback,
       std::function<void(const Stats&)> stats_callback) = 0;
 
+  /**
+   * Prefill text inputs, for example to reload chat history.
+   * @param prompt Text prompt to prefill.
+   * @param config Configuration parameters (if non-zero num_bos and num_eos
+   * used)
+   * @return The error code. KV cache position is tracked internally in pos_.
+   */
+  virtual ::executorch::runtime::Error prefill(
+      const std::string& prompt,
+      const GenerationConfig& config = {}) = 0;
+
   /**
    * Stop the generation process.
    */
diff --git a/extension/llm/runner/text_llm_runner.cpp b/extension/llm/runner/text_llm_runner.cpp
index 333716ac831..ec9c6c5242f 100644
--- a/extension/llm/runner/text_llm_runner.cpp
+++ b/extension/llm/runner/text_llm_runner.cpp
@@ -217,6 +217,28 @@ Error TextLLMRunner::generate(
   return Error::Ok;
 }
 
+Error TextLLMRunner::prefill(
+    const std::string& prompt,
+    const GenerationConfig& config) {
+  if (!is_loaded()) {
+    ET_CHECK_OK_OR_RETURN_ERROR(load());
+  }
+
+  ::tokenizers::Result<std::vector<uint64_t>> encode_res = tokenizer_->encode(
+      prompt,
+      /*bos=*/config.num_bos,
+      /*eos=*/config.num_eos);
+
+  ET_CHECK_TK_OK_OR_RETURN_ERROR(
+      encode_res.error(), "Failed to encode prompt %s", prompt.c_str());
+
+  // encode the (string) prompt into tokens sequence
+  std::vector<uint64_t> prompt_tokens = encode_res.get();
+  auto prefill_res = text_prefiller_->prefill(prompt_tokens, pos_);
+  ET_CHECK_OK_OR_RETURN_ERROR(prefill_res.error());
+  return Error::Ok;
+}
+
 Error TextLLMRunner::warmup(const std::string& prompt, int32_t max_new_tokens) {
   // Create a GenerationConfig for warmup
   GenerationConfig config{
diff --git a/extension/llm/runner/text_llm_runner.h b/extension/llm/runner/text_llm_runner.h
index 9dd99d82d59..865b8a3bd53 100644
--- a/extension/llm/runner/text_llm_runner.h
+++ b/extension/llm/runner/text_llm_runner.h
@@ -101,6 +101,17 @@ class ET_EXPERIMENTAL TextLLMRunner : public IRunner {
       std::function<void(const std::string&)> token_callback = {},
       std::function<void(const Stats&)> stats_callback = {}) override;
 
+  /**
+   * Prefill text inputs, for example to reload chat history.
+   * @param prompt Text prompt to prefill.
+   * @param config Configuration parameters (if non-zero num_bos and num_eos
+   * used)
+   * @return The error code. KV cache position is tracked internally in pos_.
+   */
+  ::executorch::runtime::Error prefill(
+      const std::string& prompt,
+      const GenerationConfig& config = {}) override;
+
   /**
    * @brief Warms up the model with a sample prompt
    *