diff --git a/packages/types/src/providers/openrouter.ts b/packages/types/src/providers/openrouter.ts
index 08ffceb1e2..d78199f1e2 100644
--- a/packages/types/src/providers/openrouter.ts
+++ b/packages/types/src/providers/openrouter.ts
@@ -39,7 +39,6 @@ export const OPEN_ROUTER_PROMPT_CACHING_MODELS = new Set([
 	"anthropic/claude-3.7-sonnet:thinking",
 	"anthropic/claude-sonnet-4",
 	"anthropic/claude-opus-4",
-	"google/gemini-2.5-pro-preview",
 	"google/gemini-2.5-flash-preview",
 	"google/gemini-2.5-flash-preview:thinking",
 	"google/gemini-2.5-flash-preview-05-20",
diff --git a/src/api/providers/fetchers/__tests__/openrouter.spec.ts b/src/api/providers/fetchers/__tests__/openrouter.spec.ts
index 1efe150ab0..bebcff2f6d 100644
--- a/src/api/providers/fetchers/__tests__/openrouter.spec.ts
+++ b/src/api/providers/fetchers/__tests__/openrouter.spec.ts
@@ -23,12 +23,22 @@ describe("OpenRouter API", () => {
 
 			const models = await getOpenRouterModels()
 
-			expect(
-				Object.entries(models)
-					.filter(([_, model]) => model.supportsPromptCache)
-					.map(([id, _]) => id)
-					.sort(),
-			).toEqual(Array.from(OPEN_ROUTER_PROMPT_CACHING_MODELS).sort())
+			const openRouterSupportedCaching = Object.entries(models)
+				.filter(([_, model]) => model.supportsPromptCache)
+				.map(([id, _]) => id)
+
+			const ourCachingModels = Array.from(OPEN_ROUTER_PROMPT_CACHING_MODELS)
+
+			// Verify all our caching models are actually supported by OpenRouter
+			for (const modelId of ourCachingModels) {
+				expect(openRouterSupportedCaching).toContain(modelId)
+			}
+
+			// Verify we have all supported models except intentionally excluded ones
+			const excludedModels = new Set(["google/gemini-2.5-pro-preview"]) // Excluded due to lag issue (#4487)
+			const expectedCachingModels = openRouterSupportedCaching.filter((id) => !excludedModels.has(id)).sort()
+
+			expect(ourCachingModels.sort()).toEqual(expectedCachingModels)
 
 			expect(
 				Object.entries(models)