diff --git a/mediapipe/tasks/web/genai/llm_inference/llm_inference.ts b/mediapipe/tasks/web/genai/llm_inference/llm_inference.ts
index f358e0823c..248aa5eee1 100644
--- a/mediapipe/tasks/web/genai/llm_inference/llm_inference.ts
+++ b/mediapipe/tasks/web/genai/llm_inference/llm_inference.ts
@@ -88,9 +88,10 @@ const LORA_MODEL_REF_INPUT_STREAM = 'lora_model_ref_in';
 const LORA_MODEL_ID_TO_LOAD_INPUT_STREAM = 'lora_model_id_to_load_in';
 
 const DEFAULT_MAX_TOKENS = 512;
-const DEFAULT_TOP_K = 1;
+const DEFAULT_TOP_K = 40;
 const DEFAULT_TOP_P = 1.0;
-const DEFAULT_TEMPERATURE = 1.0;
+const DEFAULT_TEMPERATURE = 0.8;
+const DEFAULT_RANDOM_SEED = 0;
 const DEFAULT_SAMPLER_TYPE = SamplerParameters.Type.TOP_P;
 const DEFAULT_NUM_RESPONSES = 1;
 
@@ -407,24 +408,14 @@ export class LlmInference extends TaskRunner {
     }
     if ('topK' in options) {
       this.samplerParams.setK(options.topK ?? DEFAULT_TOP_K);
-      if (options.topK && !options.randomSeed) {
-        console.warn(
-          `'topK' option ignored; it requires randomSeed to be set.`,
-        );
-      }
     }
     if ('temperature' in options) {
       this.samplerParams.setTemperature(
         options.temperature ?? DEFAULT_TEMPERATURE,
       );
-      if (options.temperature && !options.randomSeed) {
-        console.warn(
-          `'temperature' option ignored; it requires randomSeed to be set.`,
-        );
-      }
     }
-    if (options.randomSeed) {
-      this.samplerParams.setSeed(options.randomSeed);
+    if ('randomSeed' in options) {
+      this.samplerParams.setSeed(options.randomSeed ?? DEFAULT_RANDOM_SEED);
     }
     if ('loraRanks' in options) {
       this.options.setLoraRanksList(options.loraRanks ?? []);
@@ -804,6 +795,7 @@ export class LlmInference extends TaskRunner {
     this.samplerParams.setType(DEFAULT_SAMPLER_TYPE);
     this.samplerParams.setK(DEFAULT_TOP_K);
     this.samplerParams.setP(DEFAULT_TOP_P);
+    this.samplerParams.setSeed(DEFAULT_RANDOM_SEED);
     this.samplerParams.setTemperature(DEFAULT_TEMPERATURE);
     this.options.setNumResponses(DEFAULT_NUM_RESPONSES);
   }