diff --git a/go/go.mod b/go/go.mod
index 98025767b5..ed667e6b24 100644
--- a/go/go.mod
+++ b/go/go.mod
@@ -39,7 +39,7 @@ require (
 	golang.org/x/exp v0.0.0-20250408133849-7e4ce0ab07d0
 	golang.org/x/tools v0.33.0
 	google.golang.org/api v0.236.0
-	google.golang.org/genai v1.11.1
+	google.golang.org/genai v1.15.0
 )
 
 require (
diff --git a/go/go.sum b/go/go.sum
index fe5adad5cc..ad59b6479c 100644
--- a/go/go.sum
+++ b/go/go.sum
@@ -511,8 +511,8 @@ google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9Ywl
 google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
 google.golang.org/appengine/v2 v2.0.6 h1:LvPZLGuchSBslPBp+LAhihBeGSiRh1myRoYK4NtuBIw=
 google.golang.org/appengine/v2 v2.0.6/go.mod h1:WoEXGoXNfa0mLvaH5sV3ZSGXwVmy8yf7Z1JKf3J3wLI=
-google.golang.org/genai v1.11.1 h1:MgI2JVDaIQ1YMuzKFwgPciB+K6kQ8MCBMVL9u7Oa8qw=
-google.golang.org/genai v1.11.1/go.mod h1:HFXR1zT3LCdLxd/NW6IOSCczOYyRAxwaShvYbgPSeVw=
+google.golang.org/genai v1.15.0 h1:zFaM+1JfGa0KCGDqrZdwVMucEu9n5AJEKkWcSPw0qro=
+google.golang.org/genai v1.15.0/go.mod h1:QPj5NGJw+3wEOHg+PrsWwJKvG6UC84ex5FR7qAYsN/M=
 google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
 google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
 google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013/go.mod h1:NbSheEEYHJ7i3ixzK3sjbqSGDJWnxyFXZblF3eUsNvo=
diff --git a/go/plugins/googlegenai/googleai_live_test.go b/go/plugins/googlegenai/googleai_live_test.go
index e4edb8775d..61966e2b86 100644
--- a/go/plugins/googlegenai/googleai_live_test.go
+++ b/go/plugins/googlegenai/googleai_live_test.go
@@ -178,7 +178,7 @@ func TestGoogleAILive(t *testing.T) {
 		}
 	})
 	t.Run("tool with thinking", func(t *testing.T) {
-		m := googlegenai.GoogleAIModel(g, "gemini-2.5-flash-preview-04-17")
+		m := googlegenai.GoogleAIModel(g, "gemini-2.5-flash")
 		resp, err := genkit.Generate(ctx, g,
 			ai.WithConfig(&genai.GenerateContentConfig{
 				ThinkingConfig: &genai.ThinkingConfig{
@@ -435,7 +435,7 @@ func TestGoogleAILive(t *testing.T) {
 		}
 	})
 	t.Run("thinking", func(t *testing.T) {
-		m := googlegenai.GoogleAIModel(g, "gemini-2.5-flash-preview-04-17")
+		m := googlegenai.GoogleAIModel(g, "gemini-2.5-flash")
 		resp, err := genkit.Generate(ctx, g,
 			ai.WithConfig(genai.GenerateContentConfig{
 				Temperature: genai.Ptr[float32](0.4),
@@ -457,7 +457,7 @@ func TestGoogleAILive(t *testing.T) {
 		}
 	})
 	t.Run("thinking disabled", func(t *testing.T) {
-		m := googlegenai.GoogleAIModel(g, "gemini-2.5-flash-preview-04-17")
+		m := googlegenai.GoogleAIModel(g, "gemini-2.5-flash")
 		resp, err := genkit.Generate(ctx, g,
 			ai.WithConfig(genai.GenerateContentConfig{
 				Temperature: genai.Ptr[float32](0.4),
diff --git a/go/plugins/googlegenai/models.go b/go/plugins/googlegenai/models.go
index 96166a3936..127bf9b586 100644
--- a/go/plugins/googlegenai/models.go
+++ b/go/plugins/googlegenai/models.go
@@ -28,7 +28,6 @@ const (
 	gemini20FlashPrevImageGen    = "gemini-2.0-flash-preview-image-generation"
 
 	gemini25Flash             = "gemini-2.5-flash"
-	gemini25FlashPreview0417  = "gemini-2.5-flash-preview-04-17"
 	gemini25FlashLite         = "gemini-2.5-flash-lite"
 	gemini25FlashLitePrev0617 = "gemini-2.5-flash-lite-preview-06-17"
 
@@ -66,7 +65,6 @@ var (
 		gemini25Flash,
 		gemini25FlashLite,
 		gemini25Pro,
-		gemini25FlashPreview0417,
 		gemini25FlashLitePrev0617,
 		gemini25ProExp0325,
 		gemini25ProPreview0325,
@@ -90,7 +88,6 @@ var (
 		gemini25Flash,
 		gemini25FlashLite,
 		gemini25Pro,
-		gemini25FlashPreview0417,
 		gemini25FlashLitePrev0617,
 		gemini25ProExp0325,
 		gemini25ProPreview0325,
@@ -192,12 +189,6 @@ var (
 			Supports: &Multimodal,
 			Stage:    ai.ModelStageStable,
 		},
-		gemini25FlashPreview0417: {
-			Label:    "Gemini 2.5 Flash Preview 04-17",
-			Versions: []string{},
-			Supports: &Multimodal,
-			Stage:    ai.ModelStageUnstable,
-		},
 		gemini25ProExp0325: {
 			Label:    "Gemini 2.5 Pro Exp 03-25",
 			Versions: []string{},