diff --git a/docs/get-started/configuration.md b/docs/get-started/configuration.md
index fabf7e036d..ecc31d609b 100644
--- a/docs/get-started/configuration.md
+++ b/docs/get-started/configuration.md
@@ -302,7 +302,7 @@ their corresponding top-level category object in your `settings.json` file.
   - **Description:** Named presets for model configs. Can be used in place of a
     model name and can inherit from other aliases using an `extends` property.
   - **Default:**
-    `{"base":{"modelConfig":{"generateContentConfig":{"temperature":0,"topP":1}}},"chat-base":{"extends":"base","modelConfig":{"generateContentConfig":{"thinkingConfig":{"includeThoughts":true,"thinkingBudget":-1}}}},"gemini-2.5-pro":{"extends":"chat-base","modelConfig":{"model":"gemini-2.5-pro"}},"gemini-2.5-flash":{"extends":"chat-base","modelConfig":{"model":"gemini-2.5-flash"}},"gemini-2.5-flash-lite":{"extends":"chat-base","modelConfig":{"model":"gemini-2.5-flash-lite"}},"gemini-2.5-flash-base":{"extends":"base","modelConfig":{"model":"gemini-2.5-flash"}},"classifier":{"extends":"base","modelConfig":{"model":"gemini-2.5-flash-lite","generateContentConfig":{"maxOutputTokens":1024,"thinkingConfig":{"thinkingBudget":512}}}},"prompt-completion":{"extends":"base","modelConfig":{"model":"gemini-2.5-flash-lite","generateContentConfig":{"temperature":0.3,"maxOutputTokens":16000,"thinkingConfig":{"thinkingBudget":0}}}},"edit-corrector":{"extends":"base","modelConfig":{"model":"gemini-2.5-flash-lite","generateContentConfig":{"thinkingConfig":{"thinkingBudget":0}}}},"summarizer-default":{"extends":"base","modelConfig":{"model":"gemini-2.5-flash-lite","generateContentConfig":{"maxOutputTokens":2000}}},"summarizer-shell":{"extends":"base","modelConfig":{"model":"gemini-2.5-flash-lite","generateContentConfig":{"maxOutputTokens":2000}}},"web-search":{"extends":"gemini-2.5-flash-base","modelConfig":{"generateContentConfig":{"tools":[{"googleSearch":{}}]}}},"web-fetch":{"extends":"gemini-2.5-flash-base","modelConfig":{"generateContentConfig":{"tools":[{"urlContext":{}}]}}},"web-fetch-fallback":{"extends":"gemini-2.5-flash-base","modelConfig":{}},"loop-detection":{"extends":"gemini-2.5-flash-base","modelConfig":{}},"loop-detection-double-check":{"extends":"base","modelConfig":{"model":"gemini-2.5-pro"}},"llm-edit-fixer":{"extends":"gemini-2.5-flash-base","modelConfig":{}},"next-speaker-checker":{"extends":"gemini-2.5-flash-base","modelConfig":{}}}`
+    `{"base":{"modelConfig":{"generateContentConfig":{"temperature":0,"topP":1}}},"chat-base":{"extends":"base","modelConfig":{"generateContentConfig":{"thinkingConfig":{"includeThoughts":true,"thinkingBudget":-1},"temperature":1,"topP":0.95,"topK":64}}},"gemini-2.5-pro":{"extends":"chat-base","modelConfig":{"model":"gemini-2.5-pro"}},"gemini-2.5-flash":{"extends":"chat-base","modelConfig":{"model":"gemini-2.5-flash"}},"gemini-2.5-flash-lite":{"extends":"chat-base","modelConfig":{"model":"gemini-2.5-flash-lite"}},"gemini-2.5-flash-base":{"extends":"base","modelConfig":{"model":"gemini-2.5-flash"}},"classifier":{"extends":"base","modelConfig":{"model":"gemini-2.5-flash-lite","generateContentConfig":{"maxOutputTokens":1024,"thinkingConfig":{"thinkingBudget":512}}}},"prompt-completion":{"extends":"base","modelConfig":{"model":"gemini-2.5-flash-lite","generateContentConfig":{"temperature":0.3,"maxOutputTokens":16000,"thinkingConfig":{"thinkingBudget":0}}}},"edit-corrector":{"extends":"base","modelConfig":{"model":"gemini-2.5-flash-lite","generateContentConfig":{"thinkingConfig":{"thinkingBudget":0}}}},"summarizer-default":{"extends":"base","modelConfig":{"model":"gemini-2.5-flash-lite","generateContentConfig":{"maxOutputTokens":2000}}},"summarizer-shell":{"extends":"base","modelConfig":{"model":"gemini-2.5-flash-lite","generateContentConfig":{"maxOutputTokens":2000}}},"web-search":{"extends":"gemini-2.5-flash-base","modelConfig":{"generateContentConfig":{"tools":[{"googleSearch":{}}]}}},"web-fetch":{"extends":"gemini-2.5-flash-base","modelConfig":{"generateContentConfig":{"tools":[{"urlContext":{}}]}}},"web-fetch-fallback":{"extends":"gemini-2.5-flash-base","modelConfig":{}},"loop-detection":{"extends":"gemini-2.5-flash-base","modelConfig":{}},"loop-detection-double-check":{"extends":"base","modelConfig":{"model":"gemini-2.5-pro"}},"llm-edit-fixer":{"extends":"gemini-2.5-flash-base","modelConfig":{}},"next-speaker-checker":{"extends":"gemini-2.5-flash-base","modelConfig":{}}}`
 
 - **`modelConfigs.overrides`** (array):
   - **Description:** Apply specific configuration overrides based on matches,
diff --git a/packages/core/src/config/defaultModelConfigs.ts b/packages/core/src/config/defaultModelConfigs.ts
index b2f96b598a..238a3b121f 100644
--- a/packages/core/src/config/defaultModelConfigs.ts
+++ b/packages/core/src/config/defaultModelConfigs.ts
@@ -27,6 +27,9 @@ export const DEFAULT_MODEL_CONFIGS: ModelConfigServiceConfig = {
             includeThoughts: true,
             thinkingBudget: -1,
           },
+          temperature: 1,
+          topP: 0.95,
+          topK: 64,
         },
       },
     },
diff --git a/packages/core/src/services/test-data/resolved-aliases.golden.json b/packages/core/src/services/test-data/resolved-aliases.golden.json
index 695c5465eb..9a77b4f645 100644
--- a/packages/core/src/services/test-data/resolved-aliases.golden.json
+++ b/packages/core/src/services/test-data/resolved-aliases.golden.json
@@ -7,45 +7,49 @@
   },
   "chat-base": {
     "generateContentConfig": {
-      "temperature": 0,
-      "topP": 1,
+      "temperature": 1,
+      "topP": 0.95,
       "thinkingConfig": {
         "includeThoughts": true,
         "thinkingBudget": -1
-      }
+      },
+      "topK": 64
     }
   },
   "gemini-2.5-pro": {
     "model": "gemini-2.5-pro",
     "generateContentConfig": {
-      "temperature": 0,
-      "topP": 1,
+      "temperature": 1,
+      "topP": 0.95,
       "thinkingConfig": {
         "includeThoughts": true,
         "thinkingBudget": -1
-      }
+      },
+      "topK": 64
     }
   },
   "gemini-2.5-flash": {
     "model": "gemini-2.5-flash",
     "generateContentConfig": {
-      "temperature": 0,
-      "topP": 1,
+      "temperature": 1,
+      "topP": 0.95,
       "thinkingConfig": {
         "includeThoughts": true,
         "thinkingBudget": -1
-      }
+      },
+      "topK": 64
     }
   },
   "gemini-2.5-flash-lite": {
     "model": "gemini-2.5-flash-lite",
     "generateContentConfig": {
-      "temperature": 0,
-      "topP": 1,
+      "temperature": 1,
+      "topP": 0.95,
       "thinkingConfig": {
         "includeThoughts": true,
         "thinkingBudget": -1
-      }
+      },
+      "topK": 64
     }
   },
   "gemini-2.5-flash-base": {
diff --git a/schemas/settings.schema.json b/schemas/settings.schema.json
index fb60e226a2..c8a10c5ecf 100644
--- a/schemas/settings.schema.json
+++ b/schemas/settings.schema.json
@@ -415,7 +415,7 @@
     "modelConfigs": {
       "title": "Model Configs",
       "description": "Model configurations.",
-      "markdownDescription": "Model configurations.\n\n- Category: `Model`\n- Requires restart: `no`\n- Default: `{\"aliases\":{\"base\":{\"modelConfig\":{\"generateContentConfig\":{\"temperature\":0,\"topP\":1}}},\"chat-base\":{\"extends\":\"base\",\"modelConfig\":{\"generateContentConfig\":{\"thinkingConfig\":{\"includeThoughts\":true,\"thinkingBudget\":-1}}}},\"gemini-2.5-pro\":{\"extends\":\"chat-base\",\"modelConfig\":{\"model\":\"gemini-2.5-pro\"}},\"gemini-2.5-flash\":{\"extends\":\"chat-base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash\"}},\"gemini-2.5-flash-lite\":{\"extends\":\"chat-base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash-lite\"}},\"gemini-2.5-flash-base\":{\"extends\":\"base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash\"}},\"classifier\":{\"extends\":\"base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash-lite\",\"generateContentConfig\":{\"maxOutputTokens\":1024,\"thinkingConfig\":{\"thinkingBudget\":512}}}},\"prompt-completion\":{\"extends\":\"base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash-lite\",\"generateContentConfig\":{\"temperature\":0.3,\"maxOutputTokens\":16000,\"thinkingConfig\":{\"thinkingBudget\":0}}}},\"edit-corrector\":{\"extends\":\"base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash-lite\",\"generateContentConfig\":{\"thinkingConfig\":{\"thinkingBudget\":0}}}},\"summarizer-default\":{\"extends\":\"base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash-lite\",\"generateContentConfig\":{\"maxOutputTokens\":2000}}},\"summarizer-shell\":{\"extends\":\"base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash-lite\",\"generateContentConfig\":{\"maxOutputTokens\":2000}}},\"web-search\":{\"extends\":\"gemini-2.5-flash-base\",\"modelConfig\":{\"generateContentConfig\":{\"tools\":[{\"googleSearch\":{}}]}}},\"web-fetch\":{\"extends\":\"gemini-2.5-flash-base\",\"modelConfig\":{\"generateContentConfig\":{\"tools\":[{\"urlContext\":{}}]}}},\"web-fetch-fallback\":{\"extends\":\"gemini-2.5-flash-base\",\"modelConfig\":{}},\"loop-detection\":{\"extends\":\"gemini-2.5-flash-base\",\"modelConfig\":{}},\"loop-detection-double-check\":{\"extends\":\"base\",\"modelConfig\":{\"model\":\"gemini-2.5-pro\"}},\"llm-edit-fixer\":{\"extends\":\"gemini-2.5-flash-base\",\"modelConfig\":{}},\"next-speaker-checker\":{\"extends\":\"gemini-2.5-flash-base\",\"modelConfig\":{}}}}`",
+      "markdownDescription": "Model configurations.\n\n- Category: `Model`\n- Requires restart: `no`\n- Default: `{\"aliases\":{\"base\":{\"modelConfig\":{\"generateContentConfig\":{\"temperature\":0,\"topP\":1}}},\"chat-base\":{\"extends\":\"base\",\"modelConfig\":{\"generateContentConfig\":{\"thinkingConfig\":{\"includeThoughts\":true,\"thinkingBudget\":-1},\"temperature\":1,\"topP\":0.95,\"topK\":64}}},\"gemini-2.5-pro\":{\"extends\":\"chat-base\",\"modelConfig\":{\"model\":\"gemini-2.5-pro\"}},\"gemini-2.5-flash\":{\"extends\":\"chat-base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash\"}},\"gemini-2.5-flash-lite\":{\"extends\":\"chat-base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash-lite\"}},\"gemini-2.5-flash-base\":{\"extends\":\"base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash\"}},\"classifier\":{\"extends\":\"base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash-lite\",\"generateContentConfig\":{\"maxOutputTokens\":1024,\"thinkingConfig\":{\"thinkingBudget\":512}}}},\"prompt-completion\":{\"extends\":\"base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash-lite\",\"generateContentConfig\":{\"temperature\":0.3,\"maxOutputTokens\":16000,\"thinkingConfig\":{\"thinkingBudget\":0}}}},\"edit-corrector\":{\"extends\":\"base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash-lite\",\"generateContentConfig\":{\"thinkingConfig\":{\"thinkingBudget\":0}}}},\"summarizer-default\":{\"extends\":\"base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash-lite\",\"generateContentConfig\":{\"maxOutputTokens\":2000}}},\"summarizer-shell\":{\"extends\":\"base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash-lite\",\"generateContentConfig\":{\"maxOutputTokens\":2000}}},\"web-search\":{\"extends\":\"gemini-2.5-flash-base\",\"modelConfig\":{\"generateContentConfig\":{\"tools\":[{\"googleSearch\":{}}]}}},\"web-fetch\":{\"extends\":\"gemini-2.5-flash-base\",\"modelConfig\":{\"generateContentConfig\":{\"tools\":[{\"urlContext\":{}}]}}},\"web-fetch-fallback\":{\"extends\":\"gemini-2.5-flash-base\",\"modelConfig\":{}},\"loop-detection\":{\"extends\":\"gemini-2.5-flash-base\",\"modelConfig\":{}},\"loop-detection-double-check\":{\"extends\":\"base\",\"modelConfig\":{\"model\":\"gemini-2.5-pro\"}},\"llm-edit-fixer\":{\"extends\":\"gemini-2.5-flash-base\",\"modelConfig\":{}},\"next-speaker-checker\":{\"extends\":\"gemini-2.5-flash-base\",\"modelConfig\":{}}}}`",
       "default": {
         "aliases": {
           "base": {
@@ -433,7 +433,10 @@
                 "thinkingConfig": {
                   "includeThoughts": true,
                   "thinkingBudget": -1
-                }
+                },
+                "temperature": 1,
+                "topP": 0.95,
+                "topK": 64
               }
             }
           },
@@ -568,7 +571,7 @@
         "aliases": {
           "title": "Model Config Aliases",
           "description": "Named presets for model configs. Can be used in place of a model name and can inherit from other aliases using an `extends` property.",
-          "markdownDescription": "Named presets for model configs. Can be used in place of a model name and can inherit from other aliases using an `extends` property.\n\n- Category: `Model`\n- Requires restart: `no`\n- Default: `{\"base\":{\"modelConfig\":{\"generateContentConfig\":{\"temperature\":0,\"topP\":1}}},\"chat-base\":{\"extends\":\"base\",\"modelConfig\":{\"generateContentConfig\":{\"thinkingConfig\":{\"includeThoughts\":true,\"thinkingBudget\":-1}}}},\"gemini-2.5-pro\":{\"extends\":\"chat-base\",\"modelConfig\":{\"model\":\"gemini-2.5-pro\"}},\"gemini-2.5-flash\":{\"extends\":\"chat-base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash\"}},\"gemini-2.5-flash-lite\":{\"extends\":\"chat-base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash-lite\"}},\"gemini-2.5-flash-base\":{\"extends\":\"base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash\"}},\"classifier\":{\"extends\":\"base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash-lite\",\"generateContentConfig\":{\"maxOutputTokens\":1024,\"thinkingConfig\":{\"thinkingBudget\":512}}}},\"prompt-completion\":{\"extends\":\"base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash-lite\",\"generateContentConfig\":{\"temperature\":0.3,\"maxOutputTokens\":16000,\"thinkingConfig\":{\"thinkingBudget\":0}}}},\"edit-corrector\":{\"extends\":\"base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash-lite\",\"generateContentConfig\":{\"thinkingConfig\":{\"thinkingBudget\":0}}}},\"summarizer-default\":{\"extends\":\"base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash-lite\",\"generateContentConfig\":{\"maxOutputTokens\":2000}}},\"summarizer-shell\":{\"extends\":\"base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash-lite\",\"generateContentConfig\":{\"maxOutputTokens\":2000}}},\"web-search\":{\"extends\":\"gemini-2.5-flash-base\",\"modelConfig\":{\"generateContentConfig\":{\"tools\":[{\"googleSearch\":{}}]}}},\"web-fetch\":{\"extends\":\"gemini-2.5-flash-base\",\"modelConfig\":{\"generateContentConfig\":{\"tools\":[{\"urlContext\":{}}]}}},\"web-fetch-fallback\":{\"extends\":\"gemini-2.5-flash-base\",\"modelConfig\":{}},\"loop-detection\":{\"extends\":\"gemini-2.5-flash-base\",\"modelConfig\":{}},\"loop-detection-double-check\":{\"extends\":\"base\",\"modelConfig\":{\"model\":\"gemini-2.5-pro\"}},\"llm-edit-fixer\":{\"extends\":\"gemini-2.5-flash-base\",\"modelConfig\":{}},\"next-speaker-checker\":{\"extends\":\"gemini-2.5-flash-base\",\"modelConfig\":{}}}`",
+          "markdownDescription": "Named presets for model configs. Can be used in place of a model name and can inherit from other aliases using an `extends` property.\n\n- Category: `Model`\n- Requires restart: `no`\n- Default: `{\"base\":{\"modelConfig\":{\"generateContentConfig\":{\"temperature\":0,\"topP\":1}}},\"chat-base\":{\"extends\":\"base\",\"modelConfig\":{\"generateContentConfig\":{\"thinkingConfig\":{\"includeThoughts\":true,\"thinkingBudget\":-1},\"temperature\":1,\"topP\":0.95,\"topK\":64}}},\"gemini-2.5-pro\":{\"extends\":\"chat-base\",\"modelConfig\":{\"model\":\"gemini-2.5-pro\"}},\"gemini-2.5-flash\":{\"extends\":\"chat-base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash\"}},\"gemini-2.5-flash-lite\":{\"extends\":\"chat-base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash-lite\"}},\"gemini-2.5-flash-base\":{\"extends\":\"base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash\"}},\"classifier\":{\"extends\":\"base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash-lite\",\"generateContentConfig\":{\"maxOutputTokens\":1024,\"thinkingConfig\":{\"thinkingBudget\":512}}}},\"prompt-completion\":{\"extends\":\"base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash-lite\",\"generateContentConfig\":{\"temperature\":0.3,\"maxOutputTokens\":16000,\"thinkingConfig\":{\"thinkingBudget\":0}}}},\"edit-corrector\":{\"extends\":\"base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash-lite\",\"generateContentConfig\":{\"thinkingConfig\":{\"thinkingBudget\":0}}}},\"summarizer-default\":{\"extends\":\"base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash-lite\",\"generateContentConfig\":{\"maxOutputTokens\":2000}}},\"summarizer-shell\":{\"extends\":\"base\",\"modelConfig\":{\"model\":\"gemini-2.5-flash-lite\",\"generateContentConfig\":{\"maxOutputTokens\":2000}}},\"web-search\":{\"extends\":\"gemini-2.5-flash-base\",\"modelConfig\":{\"generateContentConfig\":{\"tools\":[{\"googleSearch\":{}}]}}},\"web-fetch\":{\"extends\":\"gemini-2.5-flash-base\",\"modelConfig\":{\"generateContentConfig\":{\"tools\":[{\"urlContext\":{}}]}}},\"web-fetch-fallback\":{\"extends\":\"gemini-2.5-flash-base\",\"modelConfig\":{}},\"loop-detection\":{\"extends\":\"gemini-2.5-flash-base\",\"modelConfig\":{}},\"loop-detection-double-check\":{\"extends\":\"base\",\"modelConfig\":{\"model\":\"gemini-2.5-pro\"}},\"llm-edit-fixer\":{\"extends\":\"gemini-2.5-flash-base\",\"modelConfig\":{}},\"next-speaker-checker\":{\"extends\":\"gemini-2.5-flash-base\",\"modelConfig\":{}}}`",
           "default": {
             "base": {
               "modelConfig": {
@@ -585,7 +588,10 @@
                   "thinkingConfig": {
                     "includeThoughts": true,
                     "thinkingBudget": -1
-                  }
+                  },
+                  "temperature": 1,
+                  "topP": 0.95,
+                  "topK": 64
                 }
               }
             },