feat(core): Add model config for flash 3 (#78)

docs/get-started/configuration.md

@@ -367,6 +367,12 @@ their corresponding top-level category object in your `settings.json` file.
           "model": "gemini-3-pro-preview"
         }
       },
+      "gemini-3-flash-preview": {
+        "extends": "chat-base-3",
+        "modelConfig": {
+          "model": "skyhawk"
+        }
+      },
       "gemini-2.5-pro": {
         "extends": "chat-base-2.5",
         "modelConfig": {
@@ -496,6 +502,11 @@ their corresponding top-level category object in your `settings.json` file.
           "model": "gemini-3-pro-preview"
         }
       },
+      "chat-compression-3-flash": {
+        "modelConfig": {
+          "model": "skyhawk"
+        }
+      },
       "chat-compression-2.5-pro": {
         "modelConfig": {
           "model": "gemini-2.5-pro"

packages/core/src/config/defaultModelConfigs.ts

@@ -8,6 +8,10 @@ import { ThinkingLevel } from '@google/genai';
 import type { ModelConfigServiceConfig } from '../services/modelConfigService.js';
 import { DEFAULT_THINKING_MODE } from './models.js';
 
+// TODO(joshualitt): This is safe for orions belt, but this change SHOULD NOT
+// be merged when orions belt is merged with it's upstream.
+const FLASH_PREVIEW_MODEL_REVERT_BEFORE_MERGE = 'skyhawk';
+
 // The default model configs. We use `base` as the parent for all of our model
 // configs, while `chat-base`, a child of `base`, is the parent of the models
 // we use in the "chat" experience.
@@ -65,6 +69,12 @@ export const DEFAULT_MODEL_CONFIGS: ModelConfigServiceConfig = {
         model: 'gemini-3-pro-preview',
       },
     },
+    'gemini-3-flash-preview': {
+      extends: 'chat-base-3',
+      modelConfig: {
+        model: FLASH_PREVIEW_MODEL_REVERT_BEFORE_MERGE,
+      },
+    },
     'gemini-2.5-pro': {
       extends: 'chat-base-2.5',
       modelConfig: {
@@ -188,6 +198,11 @@ export const DEFAULT_MODEL_CONFIGS: ModelConfigServiceConfig = {
         model: 'gemini-3-pro-preview',
       },
     },
+    'chat-compression-3-flash': {
+      modelConfig: {
+        model: FLASH_PREVIEW_MODEL_REVERT_BEFORE_MERGE,
+      },
+    },
     'chat-compression-2.5-pro': {
       modelConfig: {
         model: 'gemini-2.5-pro',

packages/core/src/config/models.ts

@@ -5,6 +5,7 @@
  */
 
 export const PREVIEW_GEMINI_MODEL = 'gemini-3-pro-preview';
+export const PREVIEW_GEMINI_FLASH_MODEL = 'gemini-3-flash-preview';
 export const DEFAULT_GEMINI_MODEL = 'gemini-2.5-pro';
 export const DEFAULT_GEMINI_FLASH_MODEL = 'gemini-2.5-flash';
 export const DEFAULT_GEMINI_FLASH_LITE_MODEL = 'gemini-2.5-flash-lite';

packages/core/src/services/chatCompressionService.ts

@@ -20,6 +20,7 @@ import {
   DEFAULT_GEMINI_FLASH_MODEL,
   DEFAULT_GEMINI_MODEL,
   PREVIEW_GEMINI_MODEL,
+  PREVIEW_GEMINI_FLASH_MODEL,
 } from '../config/models.js';
 import { firePreCompressHook } from '../core/sessionHookTriggers.js';
 import { PreCompressTrigger } from '../hooks/types.js';
@@ -88,6 +89,8 @@ export function modelStringToModelConfigAlias(model: string): string {
   switch (model) {
     case PREVIEW_GEMINI_MODEL:
       return 'chat-compression-3-pro';
+    case PREVIEW_GEMINI_FLASH_MODEL:
+      return 'chat-compression-3-flash';
     case DEFAULT_GEMINI_MODEL:
       return 'chat-compression-2.5-pro';
     case DEFAULT_GEMINI_FLASH_MODEL:

packages/core/src/services/test-data/resolved-aliases.golden.json

@@ -49,6 +49,18 @@
       "topK": 64
     }
   },
+  "gemini-3-flash-preview": {
+    "model": "skyhawk",
+    "generateContentConfig": {
+      "temperature": 1,
+      "topP": 0.95,
+      "thinkingConfig": {
+        "includeThoughts": true,
+        "thinkingLevel": "HIGH"
+      },
+      "topK": 64
+    }
+  },
   "gemini-2.5-pro": {
     "model": "gemini-2.5-pro",
     "generateContentConfig": {
@@ -203,6 +215,10 @@
     "model": "gemini-3-pro-preview",
     "generateContentConfig": {}
   },
+  "chat-compression-3-flash": {
+    "model": "skyhawk",
+    "generateContentConfig": {}
+  },
   "chat-compression-2.5-pro": {
     "model": "gemini-2.5-pro",
     "generateContentConfig": {}