diff --git a/packages/types/src/providers/gemini.ts b/packages/types/src/providers/gemini.ts
index 4734606d5d..b26faa39bd 100644
--- a/packages/types/src/providers/gemini.ts
+++ b/packages/types/src/providers/gemini.ts
@@ -6,6 +6,19 @@ export type GeminiModelId = keyof typeof geminiModels
 export const geminiDefaultModelId: GeminiModelId = "gemini-3.1-pro-preview"
 
 export const geminiModels = {
+	"gemini-3.5-flash": {
+		maxTokens: 65_536,
+		contextWindow: 1_048_576,
+		supportsImages: true,
+		supportsPromptCache: true,
+		supportsReasoningEffort: ["minimal", "low", "medium", "high"],
+		reasoningEffort: "medium",
+		inputPrice: 1.5,
+		outputPrice: 9,
+		cacheReadsPrice: 0.15,
+		cacheWritesPrice: 1.0,
+		supportsReasoningBudget: false,
+	},
 	"gemini-3.1-pro-preview": {
 		maxTokens: 65_536,
 		contextWindow: 1_048_576,
diff --git a/packages/types/src/providers/vertex.ts b/packages/types/src/providers/vertex.ts
index e27c0cb101..0709561a72 100644
--- a/packages/types/src/providers/vertex.ts
+++ b/packages/types/src/providers/vertex.ts
@@ -6,6 +6,19 @@ export type VertexModelId = keyof typeof vertexModels
 export const vertexDefaultModelId: VertexModelId = "claude-sonnet-4-5@20250929"
 
 export const vertexModels = {
+	"gemini-3.5-flash": {
+		maxTokens: 65_536,
+		contextWindow: 1_048_576,
+		supportsImages: true,
+		supportsPromptCache: true,
+		supportsReasoningEffort: ["minimal", "low", "medium", "high"],
+		reasoningEffort: "medium",
+		inputPrice: 1.5,
+		outputPrice: 9,
+		cacheReadsPrice: 0.15,
+		cacheWritesPrice: 1.0,
+		supportsReasoningBudget: false,
+	},
 	"gemini-3.1-pro-preview": {
 		maxTokens: 65_536,
 		contextWindow: 1_048_576,