diff --git a/packages/ai/src/providers/openai-responses.ts b/packages/ai/src/providers/openai-responses.ts
index 2be20dd81..053bc06b3 100644
--- a/packages/ai/src/providers/openai-responses.ts
+++ b/packages/ai/src/providers/openai-responses.ts
@@ -594,7 +594,11 @@ const streamOpenAIResponsesOnce = (
 						error instanceof Error &&
 						/previous[ _]?response/i.test(error.message) &&
 						/zero[ _-]?data[ _-]?retention/i.test(error.message);
-					if (!zdrRejection && !isOpenAIResponsesStalePreviousResponseError(error)) {
+					const isPromptBlocked =
+						error instanceof Error &&
+						((error as { code?: string }).code === "invalid_prompt" ||
+							/invalid_prompt|Request blocked/i.test(error.message));
+					if (!zdrRejection && !isPromptBlocked && !isOpenAIResponsesStalePreviousResponseError(error)) {
 						throw error;
 					}
 					// Server rejected the chain baseline: reset, count the failure (or
diff --git a/packages/ai/test/openai-responses-stateful.test.ts b/packages/ai/test/openai-responses-stateful.test.ts
index 8f6fb1b1a..8871f0961 100644
--- a/packages/ai/test/openai-responses-stateful.test.ts
+++ b/packages/ai/test/openai-responses-stateful.test.ts
@@ -230,6 +230,58 @@ describe("openai-responses stateful chaining", () => {
 		expect(JSON.stringify(sentRequests[2]?.input)).toContain("First question");
 		expect(JSON.stringify(sentRequests[2]?.input)).toContain("Second question");
 	});
+	it("retries a blocked invalid_prompt previous_response_id with the full transcript", async () => {
+		const sentRequests: Array<Record<string, unknown>> = [];
+		const fetchMock = vi.fn(async (_input: string | URL | Request, init?: RequestInit) => {
+			const request = JSON.parse(String(init?.body)) as Record<string, unknown>;
+			sentRequests.push(request);
+			if (typeof request.previous_response_id === "string") {
+				return new Response(
+					JSON.stringify({
+						error: {
+							message: "Request blocked.",
+							type: "invalid_request_error",
+							code: "invalid_prompt",
+						},
+					}),
+					{ status: 400, headers: { "content-type": "application/json" } },
+				);
+			}
+			return createStatefulSse(`Answer ${sentRequests.length}`, `resp_${sentRequests.length}`);
+		}) as FetchImpl;
+		const providerSessionState = new Map<string, ProviderSessionState>();
+		const options = {
+			apiKey: "test-key",
+			sessionId: "stateful-blocked-session",
+			providerSessionState,
+			statefulResponses: true,
+			reasoning: "low" as const,
+			fetch: fetchMock,
+		};
+
+		const firstUser = { role: "user" as const, content: "First question", timestamp: 1000 };
+		const firstResponse = await streamOpenAIResponses(
+			model,
+			{ systemPrompt, messages: [firstUser] },
+			options,
+		).result();
+		const secondResponse = await streamOpenAIResponses(
+			model,
+			{
+				systemPrompt,
+				messages: [firstUser, firstResponse, { role: "user", content: "Second question", timestamp: 1001 }],
+			},
+			options,
+		).result();
+
+		expect(secondResponse.stopReason).toBe("stop");
+		expect(JSON.stringify(secondResponse.content)).toContain("Answer 3");
+		expect(sentRequests).toHaveLength(3);
+		expect(sentRequests[1]?.previous_response_id).toBe("resp_1");
+		expect(sentRequests[2]?.previous_response_id).toBeUndefined();
+		expect(JSON.stringify(sentRequests[2]?.input)).toContain("First question");
+		expect(JSON.stringify(sentRequests[2]?.input)).toContain("Second question");
+	});
 
 	it("disables chaining for the session after repeated stale failures and stops forcing store", async () => {
 		const sentRequests: Array<Record<string, unknown>> = [];