feat(core): Incorporate Gemini 3 into model config hierarchy. (#13447)

Author: joshualitt

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,

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';
 
@@ -26,41 +27,58 @@ 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,
           topK: 64,
         },
       },
     },
+    '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',
       },

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,
@@ -16,14 +26,25 @@
       "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": {
       "temperature": 1,
       "topP": 0.95,
       "thinkingConfig": {
         "includeThoughts": true,
-        "thinkingBudget": 8192
+        "thinkingLevel": "HIGH"
       },
       "topK": 64
     }