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[Internal Testing] Promote Gemini 3.1 Flash Lite to GA and support Gemini 3.5 Flash #27705

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[Internal Testing] Promote Gemini 3.1 Flash Lite to GA and support Gemini 3.5 Flash #27705

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a57f33a
Update default flash lite tool model
DavidAPierce May 14, 2026
eb42ff6
feat: promote Gemini 3.1 Flash Lite to GA and support Gemini 3.5 Flash
sripasg Jun 5, 2026
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186 changes: 131 additions & 55 deletions docs/reference/configuration.md
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Original file line number Diff line number Diff line change
Expand Up @@ -545,6 +545,24 @@
"model": "gemini-3-flash-preview"
}
},
"gemini-3.1-pro-preview": {
"extends": "chat-base-3",
"modelConfig": {
"model": "gemini-3.1-pro-preview"
}
},
"gemini-3.1-pro-preview-customtools": {
"extends": "chat-base-3",
"modelConfig": {
"model": "gemini-3.1-pro-preview-customtools"
}
},
"gemini-3.1-flash-lite-preview": {
"extends": "chat-base-3",
"modelConfig": {
"model": "gemini-3.1-flash-lite-preview"
}
},
"gemini-2.5-pro": {
"extends": "chat-base-2.5",
"modelConfig": {
Expand All @@ -563,6 +581,18 @@
"model": "gemini-2.5-flash-lite"
}
},
"gemini-3.1-flash-lite": {
"extends": "chat-base-3",
"modelConfig": {
"model": "gemini-3.1-flash-lite"
}
},
"gemini-3.5-flash": {

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"extends": "chat-base-3",
"modelConfig": {
"model": "gemini-3.5-flash"

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}
},
"gemma-4-31b-it": {
"extends": "chat-base-3",
"modelConfig": {
Expand All @@ -587,10 +617,16 @@
"model": "gemini-3-flash-preview"
}
},
"gemini-3.5-flash-base": {

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"extends": "base",
"modelConfig": {
"model": "gemini-3.5-flash"

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}
},
"classifier": {
"extends": "base",
"modelConfig": {
"model": "gemini-2.5-flash-lite",
"model": "flash-lite",
"generateContentConfig": {
"maxOutputTokens": 1024,
"thinkingConfig": {
Expand All @@ -602,7 +638,7 @@
"prompt-completion": {
"extends": "base",
"modelConfig": {
"model": "gemini-2.5-flash-lite",
"model": "flash-lite",
"generateContentConfig": {
"temperature": 0.3,
"maxOutputTokens": 16000,
Expand All @@ -615,7 +651,7 @@
"fast-ack-helper": {
"extends": "base",
"modelConfig": {
"model": "gemini-2.5-flash-lite",
"model": "flash-lite",
"generateContentConfig": {
"temperature": 0.2,
"maxOutputTokens": 120,
Expand All @@ -628,7 +664,7 @@
"edit-corrector": {
"extends": "base",
"modelConfig": {
"model": "gemini-2.5-flash-lite",
"model": "flash-lite",
"generateContentConfig": {
"thinkingConfig": {
"thinkingBudget": 0
Expand All @@ -639,7 +675,7 @@
"summarizer-default": {
"extends": "base",
"modelConfig": {
"model": "gemini-2.5-flash-lite",
"model": "flash-lite",
"generateContentConfig": {
"maxOutputTokens": 2000
}
Expand All @@ -648,7 +684,7 @@
"summarizer-shell": {
"extends": "base",
"modelConfig": {
"model": "gemini-2.5-flash-lite",
"model": "flash-lite",
"generateContentConfig": {
"maxOutputTokens": 2000
}
Expand Down Expand Up @@ -725,7 +761,7 @@
},
"chat-compression-3.1-flash-lite": {
"modelConfig": {
"model": "gemini-3.1-flash-lite-preview"
"model": "gemini-3.1-flash-lite"
}
},
"chat-compression-2.5-pro": {
Expand Down Expand Up @@ -779,10 +815,10 @@

```json
{
"gemini-3.1-flash-lite-preview": {
"gemini-3.1-flash-lite": {
"tier": "flash-lite",
"family": "gemini-3",
"isPreview": true,
"isPreview": false,
"isVisible": true,
"features": {
"thinking": false,
Expand Down Expand Up @@ -829,6 +865,16 @@
"multimodalToolUse": true
}
},
"gemini-3.5-flash": {

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"tier": "flash",
"family": "gemini-3",
"isPreview": false,
"isVisible": true,
"features": {
"thinking": false,
"multimodalToolUse": true
}
},
"gemini-2.5-pro": {
"tier": "pro",
"family": "gemini-2.5",
Expand Down Expand Up @@ -882,9 +928,10 @@
}
},
"auto": {
"displayName": "Auto",
"tier": "auto",
"isPreview": true,
"isVisible": false,
"isVisible": true,
"features": {
"thinking": true,
"multimodalToolUse": false
Expand Down Expand Up @@ -918,26 +965,16 @@
}
},
"auto-gemini-3": {
"displayName": "Auto (Gemini 3)",
"tier": "auto",
"family": "gemini-3",
"isPreview": true,
"isVisible": true,
"dialogDescription": "Let Gemini CLI decide the best model for the task: gemini-3-pro, gemini-3-flash",
"features": {
"thinking": true,
"multimodalToolUse": false
}
"isVisible": false
},
"auto-gemini-2.5": {
"displayName": "Auto (Gemini 2.5)",
"tier": "auto",
"family": "gemini-2.5",
"isPreview": false,
"isVisible": true,
"dialogDescription": "Let Gemini CLI decide the best model for the task: gemini-2.5-pro, gemini-2.5-flash",
"features": {
"thinking": false,
"multimodalToolUse": false
}
"isVisible": false
}
}
```
Expand Down Expand Up @@ -990,37 +1027,50 @@
"contexts": [
{
"condition": {
"hasAccessToPreview": false
"hasAccessToPreview": false,
"useGemini3_5Flash": true
},
"target": "gemini-3.5-flash"

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},
{
"condition": {
"hasAccessToPreview": false,
"useGemini3_5Flash": false
},
"target": "gemini-2.5-flash"
}
]
},
"gemini-3-pro-preview": {
"default": "gemini-3-pro-preview",
"gemini-3.5-flash": {

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"default": "gemini-3.5-flash",

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"contexts": [
{
"condition": {
"useGemini3_5Flash": false,
"hasAccessToPreview": false
},
"target": "gemini-2.5-pro"
"target": "gemini-2.5-flash"
},
{
"condition": {
"useGemini3_1": true,
"useCustomTools": true
"useGemini3_5Flash": false
},
"target": "gemini-3.1-pro-preview-customtools"
},
"target": "gemini-3-flash-preview"
}
]
},
"gemini-2.5-flash": {
"default": "gemini-2.5-flash",
"contexts": [
{
"condition": {
"useGemini3_1": true
"useGemini3_5Flash": true
},
"target": "gemini-3.1-pro-preview"
"target": "gemini-3.5-flash"

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}
]
},
"auto-gemini-3": {
"gemini-3-pro-preview": {
"default": "gemini-3-pro-preview",
"contexts": [
{
Expand Down Expand Up @@ -1092,23 +1142,18 @@
}
]
},
"auto-gemini-2.5": {
"default": "gemini-2.5-pro"
"gemini-3.1-flash-lite": {
"default": "gemini-3.1-flash-lite"
},
"gemini-3.1-flash-lite-preview": {
"default": "gemini-3.1-flash-lite-preview",
"flash": {
"default": "gemini-3-flash-preview",
"contexts": [
{
"condition": {
"useGemini3_1FlashLite": false
"useGemini3_5Flash": true
},
"target": "gemini-2.5-flash-lite"
}
]
},
"flash": {
"default": "gemini-3-flash-preview",
"contexts": [
"target": "gemini-3.5-flash"

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},
{
"condition": {
"hasAccessToPreview": false
Expand All @@ -1118,15 +1163,34 @@
]
},
"flash-lite": {
"default": "gemini-2.5-flash-lite",
"default": "gemini-3.1-flash-lite"
},
"auto-gemini-3": {
"default": "gemini-3-pro-preview",
"contexts": [
{
"condition": {
"useGemini3_1FlashLite": true
"hasAccessToPreview": false
},
"target": "gemini-2.5-pro"
},
{
"condition": {
"useGemini3_1": true,
"useCustomTools": true
},
"target": "gemini-3.1-flash-lite-preview"
"target": "gemini-3.1-pro-preview-customtools"
},
{
"condition": {
"useGemini3_1": true
},
"target": "gemini-3.1-pro-preview"
}
]
},
"auto-gemini-2.5": {
"default": "gemini-2.5-pro"
}
}
```
Expand All @@ -1145,15 +1209,21 @@
"contexts": [
{
"condition": {
"requestedModels": ["auto-gemini-2.5", "gemini-2.5-pro"]
"useGemini3_5Flash": true
},
"target": "gemini-3.5-flash"
},
{
"condition": {
"hasAccessToPreview": false
},
"target": "gemini-2.5-flash"
},
{
"condition": {
"requestedModels": ["auto-gemini-3", "gemini-3-pro-preview"]
"requestedModels": ["gemini-2.5-pro", "auto-gemini-2.5"]
},
"target": "gemini-3-flash-preview"
"target": "gemini-2.5-flash"
}
]
},
Expand All @@ -1162,7 +1232,13 @@
"contexts": [
{
"condition": {
"requestedModels": ["auto-gemini-2.5", "gemini-2.5-pro"]
"hasAccessToPreview": false
},
"target": "gemini-2.5-pro"
},
{
"condition": {
"requestedModels": ["gemini-2.5-pro", "auto-gemini-2.5"]
},
"target": "gemini-2.5-pro"
},
Expand Down Expand Up @@ -1333,7 +1409,7 @@
],
"lite": [
{
"model": "gemini-2.5-flash-lite",
"model": "flash-lite",
"actions": {
"terminal": "silent",
"transient": "silent",
Expand Down
5 changes: 5 additions & 0 deletions evals/interactive-hang.eval.ts
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Expand Up @@ -54,6 +54,11 @@ describe('interactive_commands', () => {
suiteName: 'default',
suiteType: 'behavioral',
name: 'should use non-interactive flags when scaffolding a new app',
params: {
settings: {
plan: false,
},
},
prompt: 'Create a new react application named my-app using vite.',
assert: async (rig, result) => {
const logs = rig.readToolLogs();
Expand Down
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