diff --git a/cmd/cody-gateway/shared/config/config.go b/cmd/cody-gateway/shared/config/config.go
index 544252370a7..08ea5614970 100644
--- a/cmd/cody-gateway/shared/config/config.go
+++ b/cmd/cody-gateway/shared/config/config.go
@@ -311,6 +311,8 @@ func (c *Config) Load() {
 			google.Gemini15FlashLatest,
 			google.Gemini15ProLatest,
 			google.GeminiProLatest,
+			google.Gemini15Flash001,
+			google.Gemini15Pro001,
 			google.Gemini15Flash,
 			google.Gemini15Pro,
 			google.GeminiPro,
diff --git a/cmd/frontend/internal/dotcom/productsubscription/codygateway_dotcom_user.go b/cmd/frontend/internal/dotcom/productsubscription/codygateway_dotcom_user.go
index daf356b3b1c..bfa9f41196a 100644
--- a/cmd/frontend/internal/dotcom/productsubscription/codygateway_dotcom_user.go
+++ b/cmd/frontend/internal/dotcom/productsubscription/codygateway_dotcom_user.go
@@ -335,6 +335,7 @@ var allCodeCompletionModels = slices.Concat([]string{"anthropic/" + anthropic.Cl
 	"anthropic/claude-instant-1.2",
 	"google/" + google.Gemini15Flash,
 	"google/" + google.Gemini15FlashLatest,
+	"google/" + google.Gemini15Flash001,
 	"google/" + google.GeminiPro,
 	"google/" + google.GeminiProLatest,
 	"fireworks/starcoder",
@@ -377,6 +378,8 @@ func allowedModels(scope types.CompletionsFeature, isProUser bool) []string {
 			"google/" + google.Gemini15FlashLatest,
 			"google/" + google.Gemini15ProLatest,
 			"google/" + google.GeminiProLatest,
+			"google/" + google.Gemini15Flash001,
+			"google/" + google.Gemini15Pro001,
 			"google/" + google.Gemini15Flash,
 			"google/" + google.Gemini15Pro,
 			"google/" + google.GeminiPro,
diff --git a/cmd/frontend/internal/httpapi/completions/get_model.go b/cmd/frontend/internal/httpapi/completions/get_model.go
index 5fa94eb51b0..259637894cd 100644
--- a/cmd/frontend/internal/httpapi/completions/get_model.go
+++ b/cmd/frontend/internal/httpapi/completions/get_model.go
@@ -100,6 +100,7 @@ func isAllowedCodeCompletionModel(model string) bool {
 		"anthropic/claude-instant-1.2-cyan",
 		"google/" + google.Gemini15Flash,
 		"google/" + google.Gemini15FlashLatest,
+		"google/" + google.Gemini15Flash001,
 		"google/" + google.GeminiPro,
 		"google/" + google.GeminiProLatest,
 		"fireworks/accounts/sourcegraph/models/starcoder-7b",
@@ -132,6 +133,8 @@ func isAllowedCustomChatModel(model string, isProUser bool) bool {
 			"google/" + google.Gemini15FlashLatest,
 			"google/" + google.Gemini15ProLatest,
 			"google/" + google.GeminiProLatest,
+			"google/" + google.Gemini15Flash001,
+			"google/" + google.Gemini15Pro001,
 			"google/" + google.Gemini15Flash,
 			"google/" + google.Gemini15Pro,
 			"google/" + google.GeminiPro,
diff --git a/internal/completions/client/google/models.go b/internal/completions/client/google/models.go
index e1ab40c9a51..d3a474511be 100644
--- a/internal/completions/client/google/models.go
+++ b/internal/completions/client/google/models.go
@@ -19,3 +19,9 @@ const GeminiPro = "gemini-pro"
 const Gemini15FlashLatest = "gemini-1.5-flash-latest"
 const Gemini15ProLatest = "gemini-1.5-pro-latest"
 const GeminiProLatest = "gemini-pro-latest"
+
+// Fixed stable versions
+// NOTE: Only the fixed stable versions support context caching.
+// Ref: https://ai.google.dev/gemini-api/docs/caching?lang=node
+const Gemini15Flash001 = "gemini-1.5-flash-001"
+const Gemini15Pro001 = "gemini-1.5-pro-001"