diff --git a/docs/get-started/configuration.md b/docs/get-started/configuration.md
index 1d09e00548..33e4926ec1 100644
--- a/docs/get-started/configuration.md
+++ b/docs/get-started/configuration.md
@@ -317,7 +317,7 @@ 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":8192},"temperature":1,"topP":0.95,"topK":64}}},"gemini-3-pro-preview":{"extends":"chat-base","modelConfig":{"model":"gemini-3-pro-preview"}},"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},"temperature":1,"topP":0.95,"topK":64}}},"chat-base-2.5":{"extends":"chat-base","modelConfig":{"generateContentConfig":{"thinkingConfig":{"thinkingBudget":8192}}}},"chat-base-3":{"extends":"chat-base","modelConfig":{"generateContentConfig":{"thinkingConfig":{"thinkingLevel":"HIGH"}}}},"gemini-3-pro-preview":{"extends":"chat-base-3","modelConfig":{"model":"gemini-3-pro-preview"}},"gemini-2.5-pro":{"extends":"chat-base-2.5","modelConfig":{"model":"gemini-2.5-pro"}},"gemini-2.5-flash":{"extends":"chat-base-2.5","modelConfig":{"model":"gemini-2.5-flash"}},"gemini-2.5-flash-lite":{"extends":"chat-base-2.5","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 50db3c0555..91ab827205 100644
--- a/packages/core/src/config/defaultModelConfigs.ts
+++ b/packages/core/src/config/defaultModelConfigs.ts
@@ -4,6 +4,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+import { ThinkingLevel } from '@google/genai';
 import type { ModelConfigServiceConfig } from '../services/modelConfigService.js';
 import { DEFAULT_THINKING_MODE } from './models.js';
 
@@ -26,9 +27,6 @@ export const DEFAULT_MODEL_CONFIGS: ModelConfigServiceConfig = {
         generateContentConfig: {
           thinkingConfig: {
             includeThoughts: true,
-            // TODO(joshualitt): Introduce new bases for Gemini 3 models to use
-            // thinkingLevel instead.
-            thinkingBudget: DEFAULT_THINKING_MODE,
           },
           temperature: 1,
           topP: 0.95,
@@ -36,31 +34,51 @@ export const DEFAULT_MODEL_CONFIGS: ModelConfigServiceConfig = {
         },
       },
     },
+    'chat-base-2.5': {
+      extends: 'chat-base',
+      modelConfig: {
+        generateContentConfig: {
+          thinkingConfig: {
+            thinkingBudget: DEFAULT_THINKING_MODE,
+          },
+        },
+      },
+    },
+    'chat-base-3': {
+      extends: 'chat-base',
+      modelConfig: {
+        generateContentConfig: {
+          thinkingConfig: {
+            thinkingLevel: ThinkingLevel.HIGH,
+          },
+        },
+      },
+    },
     // Because `gemini-2.5-pro` and related model configs are "user-facing"
     // today, i.e. they could be passed via `--model`, we have to be careful to
     // ensure these model configs can be used interactively.
     // TODO(joshualitt): Introduce internal base configs for the various models,
     // note: we will have to think carefully about names.
     'gemini-3-pro-preview': {
-      extends: 'chat-base',
+      extends: 'chat-base-3',
       modelConfig: {
         model: 'gemini-3-pro-preview',
       },
     },
     'gemini-2.5-pro': {
-      extends: 'chat-base',
+      extends: 'chat-base-2.5',
       modelConfig: {
         model: 'gemini-2.5-pro',
       },
     },
     'gemini-2.5-flash': {
-      extends: 'chat-base',
+      extends: 'chat-base-2.5',
       modelConfig: {
         model: 'gemini-2.5-flash',
       },
     },
     'gemini-2.5-flash-lite': {
-      extends: 'chat-base',
+      extends: 'chat-base-2.5',
       modelConfig: {
         model: 'gemini-2.5-flash-lite',
       },
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 7cba3af634..984f3330d1 100644
--- a/packages/core/src/services/test-data/resolved-aliases.golden.json
+++ b/packages/core/src/services/test-data/resolved-aliases.golden.json
@@ -6,6 +6,16 @@
     }
   },
   "chat-base": {
+    "generateContentConfig": {
+      "temperature": 1,
+      "topP": 0.95,
+      "thinkingConfig": {
+        "includeThoughts": true
+      },
+      "topK": 64
+    }
+  },
+  "chat-base-2.5": {
     "generateContentConfig": {
       "temperature": 1,
       "topP": 0.95,
@@ -16,6 +26,17 @@
       "topK": 64
     }
   },
+  "chat-base-3": {
+    "generateContentConfig": {
+      "temperature": 1,
+      "topP": 0.95,
+      "thinkingConfig": {
+        "includeThoughts": true,
+        "thinkingLevel": "HIGH"
+      },
+      "topK": 64
+    }
+  },
   "gemini-3-pro-preview": {
     "model": "gemini-3-pro-preview",
     "generateContentConfig": {
@@ -23,7 +44,7 @@
       "topP": 0.95,
       "thinkingConfig": {
         "includeThoughts": true,
-        "thinkingBudget": 8192
+        "thinkingLevel": "HIGH"
       },
       "topK": 64
     }
diff --git a/schemas/settings.schema.json b/schemas/settings.schema.json
index 03ce51a6a6..3bc6a5f7b1 100644
--- a/schemas/settings.schema.json
+++ b/schemas/settings.schema.json
@@ -436,7 +436,7 @@
     "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\":8192},\"temperature\":1,\"topP\":0.95,\"topK\":64}}},\"gemini-3-pro-preview\":{\"extends\":\"chat-base\",\"modelConfig\":{\"model\":\"gemini-3-pro-preview\"}},\"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},\"temperature\":1,\"topP\":0.95,\"topK\":64}}},\"chat-base-2.5\":{\"extends\":\"chat-base\",\"modelConfig\":{\"generateContentConfig\":{\"thinkingConfig\":{\"thinkingBudget\":8192}}}},\"chat-base-3\":{\"extends\":\"chat-base\",\"modelConfig\":{\"generateContentConfig\":{\"thinkingConfig\":{\"thinkingLevel\":\"HIGH\"}}}},\"gemini-3-pro-preview\":{\"extends\":\"chat-base-3\",\"modelConfig\":{\"model\":\"gemini-3-pro-preview\"}},\"gemini-2.5-pro\":{\"extends\":\"chat-base-2.5\",\"modelConfig\":{\"model\":\"gemini-2.5-pro\"}},\"gemini-2.5-flash\":{\"extends\":\"chat-base-2.5\",\"modelConfig\":{\"model\":\"gemini-2.5-flash\"}},\"gemini-2.5-flash-lite\":{\"extends\":\"chat-base-2.5\",\"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": {
@@ -452,8 +452,7 @@
             "modelConfig": {
               "generateContentConfig": {
                 "thinkingConfig": {
-                  "includeThoughts": true,
-                  "thinkingBudget": 8192
+                  "includeThoughts": true
                 },
                 "temperature": 1,
                 "topP": 0.95,
@@ -461,26 +460,46 @@
               }
             }
           },
-          "gemini-3-pro-preview": {
+          "chat-base-2.5": {
             "extends": "chat-base",
+            "modelConfig": {
+              "generateContentConfig": {
+                "thinkingConfig": {
+                  "thinkingBudget": 8192
+                }
+              }
+            }
+          },
+          "chat-base-3": {
+            "extends": "chat-base",
+            "modelConfig": {
+              "generateContentConfig": {
+                "thinkingConfig": {
+                  "thinkingLevel": "HIGH"
+                }
+              }
+            }
+          },
+          "gemini-3-pro-preview": {
+            "extends": "chat-base-3",
             "modelConfig": {
               "model": "gemini-3-pro-preview"
             }
           },
           "gemini-2.5-pro": {
-            "extends": "chat-base",
+            "extends": "chat-base-2.5",
             "modelConfig": {
               "model": "gemini-2.5-pro"
             }
           },
           "gemini-2.5-flash": {
-            "extends": "chat-base",
+            "extends": "chat-base-2.5",
             "modelConfig": {
               "model": "gemini-2.5-flash"
             }
           },
           "gemini-2.5-flash-lite": {
-            "extends": "chat-base",
+            "extends": "chat-base-2.5",
             "modelConfig": {
               "model": "gemini-2.5-flash-lite"
             }
@@ -598,7 +617,7 @@
         "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\":8192},\"temperature\":1,\"topP\":0.95,\"topK\":64}}},\"gemini-3-pro-preview\":{\"extends\":\"chat-base\",\"modelConfig\":{\"model\":\"gemini-3-pro-preview\"}},\"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},\"temperature\":1,\"topP\":0.95,\"topK\":64}}},\"chat-base-2.5\":{\"extends\":\"chat-base\",\"modelConfig\":{\"generateContentConfig\":{\"thinkingConfig\":{\"thinkingBudget\":8192}}}},\"chat-base-3\":{\"extends\":\"chat-base\",\"modelConfig\":{\"generateContentConfig\":{\"thinkingConfig\":{\"thinkingLevel\":\"HIGH\"}}}},\"gemini-3-pro-preview\":{\"extends\":\"chat-base-3\",\"modelConfig\":{\"model\":\"gemini-3-pro-preview\"}},\"gemini-2.5-pro\":{\"extends\":\"chat-base-2.5\",\"modelConfig\":{\"model\":\"gemini-2.5-pro\"}},\"gemini-2.5-flash\":{\"extends\":\"chat-base-2.5\",\"modelConfig\":{\"model\":\"gemini-2.5-flash\"}},\"gemini-2.5-flash-lite\":{\"extends\":\"chat-base-2.5\",\"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": {
@@ -613,8 +632,7 @@
               "modelConfig": {
                 "generateContentConfig": {
                   "thinkingConfig": {
-                    "includeThoughts": true,
-                    "thinkingBudget": 8192
+                    "includeThoughts": true
                   },
                   "temperature": 1,
                   "topP": 0.95,
@@ -622,26 +640,46 @@
                 }
               }
             },
-            "gemini-3-pro-preview": {
+            "chat-base-2.5": {
               "extends": "chat-base",
+              "modelConfig": {
+                "generateContentConfig": {
+                  "thinkingConfig": {
+                    "thinkingBudget": 8192
+                  }
+                }
+              }
+            },
+            "chat-base-3": {
+              "extends": "chat-base",
+              "modelConfig": {
+                "generateContentConfig": {
+                  "thinkingConfig": {
+                    "thinkingLevel": "HIGH"
+                  }
+                }
+              }
+            },
+            "gemini-3-pro-preview": {
+              "extends": "chat-base-3",
               "modelConfig": {
                 "model": "gemini-3-pro-preview"
               }
             },
             "gemini-2.5-pro": {
-              "extends": "chat-base",
+              "extends": "chat-base-2.5",
               "modelConfig": {
                 "model": "gemini-2.5-pro"
               }
             },
             "gemini-2.5-flash": {
-              "extends": "chat-base",
+              "extends": "chat-base-2.5",
               "modelConfig": {
                 "model": "gemini-2.5-flash"
               }
             },
             "gemini-2.5-flash-lite": {
-              "extends": "chat-base",
+              "extends": "chat-base-2.5",
               "modelConfig": {
                 "model": "gemini-2.5-flash-lite"
               }