diff --git a/extensions/byteplus/video-generation-provider.ts b/extensions/byteplus/video-generation-provider.ts
index d4000469102..a3bf5bf0110 100644
--- a/extensions/byteplus/video-generation-provider.ts
+++ b/extensions/byteplus/video-generation-provider.ts
@@ -90,10 +90,11 @@ async function pollBytePlusTask(params: {
         method: "GET",
         headers: params.headers,
       },
-      timeoutMs: resolveProviderOperationTimeoutMs({
-        deadline,
-        defaultTimeoutMs: DEFAULT_TIMEOUT_MS,
-      }),
+      timeoutMs: () =>
+        resolveProviderOperationTimeoutMs({
+          deadline,
+          defaultTimeoutMs: DEFAULT_TIMEOUT_MS,
+        }),
       fetchFn: params.fetchFn,
       provider: "byteplus",
       requestFailedMessage: "BytePlus video status request failed",
diff --git a/extensions/minimax/provider-http.test-helpers.ts b/extensions/minimax/provider-http.test-helpers.ts
index 1f29f95144d..370113667fc 100644
--- a/extensions/minimax/provider-http.test-helpers.ts
+++ b/extensions/minimax/provider-http.test-helpers.ts
@@ -47,12 +47,18 @@ const minimaxProviderHttpMocks = vi.hoisted(() => ({
   })),
 }));
 
+function resolveMockProviderTimeoutMs(
+  timeoutMs: FetchProviderOperationResponseParams["timeoutMs"],
+) {
+  return typeof timeoutMs === "function" ? timeoutMs() : (timeoutMs ?? 60_000);
+}
+
 minimaxProviderHttpMocks.fetchProviderOperationResponseMock.mockImplementation(
   async (params: FetchProviderOperationResponseParams) => {
     const response = await minimaxProviderHttpMocks.fetchWithTimeoutMock(
       params.url,
       params.init ?? {},
-      params.timeoutMs ?? 60_000,
+      resolveMockProviderTimeoutMs(params.timeoutMs),
       params.fetchFn,
     );
     if (params.requestFailedMessage) {
@@ -70,7 +76,7 @@ minimaxProviderHttpMocks.fetchProviderDownloadResponseMock.mockImplementation(
     const response = await minimaxProviderHttpMocks.fetchWithTimeoutMock(
       params.url,
       params.init ?? {},
-      params.timeoutMs ?? 60_000,
+      resolveMockProviderTimeoutMs(params.timeoutMs),
       params.fetchFn,
     );
     await minimaxProviderHttpMocks.assertOkOrThrowHttpErrorMock(
diff --git a/extensions/minimax/video-generation-provider.ts b/extensions/minimax/video-generation-provider.ts
index 9fde36c110a..2121b7d1002 100644
--- a/extensions/minimax/video-generation-provider.ts
+++ b/extensions/minimax/video-generation-provider.ts
@@ -179,10 +179,11 @@ async function pollMinimaxVideo(params: {
         method: "GET",
         headers: params.headers,
       },
-      timeoutMs: resolveProviderOperationTimeoutMs({
-        deadline,
-        defaultTimeoutMs: DEFAULT_TIMEOUT_MS,
-      }),
+      timeoutMs: () =>
+        resolveProviderOperationTimeoutMs({
+          deadline,
+          defaultTimeoutMs: DEFAULT_TIMEOUT_MS,
+        }),
       fetchFn: params.fetchFn,
       provider: "minimax",
       requestFailedMessage: "MiniMax video status request failed",
diff --git a/extensions/runway/video-generation-provider.ts b/extensions/runway/video-generation-provider.ts
index 469ebfc177b..57e8e6f043c 100644
--- a/extensions/runway/video-generation-provider.ts
+++ b/extensions/runway/video-generation-provider.ts
@@ -216,10 +216,11 @@ async function pollRunwayTask(params: {
         method: "GET",
         headers: params.headers,
       },
-      timeoutMs: resolveProviderOperationTimeoutMs({
-        deadline,
-        defaultTimeoutMs: DEFAULT_TIMEOUT_MS,
-      }),
+      timeoutMs: () =>
+        resolveProviderOperationTimeoutMs({
+          deadline,
+          defaultTimeoutMs: DEFAULT_TIMEOUT_MS,
+        }),
       fetchFn: params.fetchFn,
       provider: "runway",
       requestFailedMessage: "Runway video status request failed",
diff --git a/extensions/xai/video-generation-provider.ts b/extensions/xai/video-generation-provider.ts
index 4da9e440b78..6669d424200 100644
--- a/extensions/xai/video-generation-provider.ts
+++ b/extensions/xai/video-generation-provider.ts
@@ -269,10 +269,11 @@ async function pollXaiVideo(params: {
         method: "GET",
         headers: params.headers,
       },
-      timeoutMs: resolveProviderOperationTimeoutMs({
-        deadline,
-        defaultTimeoutMs: DEFAULT_TIMEOUT_MS,
-      }),
+      timeoutMs: () =>
+        resolveProviderOperationTimeoutMs({
+          deadline,
+          defaultTimeoutMs: DEFAULT_TIMEOUT_MS,
+        }),
       fetchFn: params.fetchFn,
       provider: "xai",
       requestFailedMessage: "xAI video status request failed",
diff --git a/src/media-understanding/shared.test.ts b/src/media-understanding/shared.test.ts
index cd981697dd6..c3a31a08d06 100644
--- a/src/media-understanding/shared.test.ts
+++ b/src/media-understanding/shared.test.ts
@@ -213,6 +213,39 @@ describe("provider operation deadlines", () => {
     expect(fetchFn).toHaveBeenCalledTimes(2);
   });
 
+  it("recomputes remaining poll timeout before retry attempts", async () => {
+    vi.useFakeTimers();
+    vi.setSystemTime(1_000);
+    const fetchFn = vi.fn<typeof fetch>(async () => {
+      vi.setSystemTime(2_001);
+      return new Response("busy", { status: 503, statusText: "Service Unavailable" });
+    });
+
+    const result = pollProviderOperationJson<{ status?: string }>({
+      url: "https://api.example.com/v1/videos/task-1",
+      headers: new Headers({ authorization: "Bearer test" }),
+      deadline: createProviderOperationDeadline({
+        label: "video generation task task-1",
+        timeoutMs: 1_000,
+      }),
+      defaultTimeoutMs: 5_000,
+      fetchFn,
+      maxAttempts: 3,
+      pollIntervalMs: 1_000,
+      requestFailedMessage: "status failed",
+      timeoutMessage: "task timed out",
+      isComplete: (payload) => payload.status === "completed",
+    });
+    const assertion = expect(result).rejects.toThrow(
+      "video generation task task-1 timed out after 1000ms",
+    );
+
+    await vi.advanceTimersByTimeAsync(250);
+
+    await assertion;
+    expect(fetchFn).toHaveBeenCalledTimes(1);
+  });
+
   it("retries transient generated asset downloads", async () => {
     const sleep = vi.fn(async () => undefined);
     const fetchFn = vi
diff --git a/src/media-understanding/shared.ts b/src/media-understanding/shared.ts
index d3b76f9fe2e..fc8a6653ca4 100644
--- a/src/media-understanding/shared.ts
+++ b/src/media-understanding/shared.ts
@@ -71,6 +71,8 @@ export type ProviderOperationDeadline = {
   timeoutMs?: number;
 };
 
+export type ProviderOperationTimeoutMs = number | (() => number);
+
 export function createProviderOperationDeadline(params: {
   timeoutMs?: number;
   label: string;
@@ -142,10 +144,11 @@ export async function pollProviderOperationJson<TPayload>(params: {
         method: "GET",
         headers: params.headers,
       },
-      timeoutMs: resolveProviderOperationTimeoutMs({
-        deadline: params.deadline,
-        defaultTimeoutMs: params.defaultTimeoutMs,
-      }),
+      timeoutMs: () =>
+        resolveProviderOperationTimeoutMs({
+          deadline: params.deadline,
+          defaultTimeoutMs: params.defaultTimeoutMs,
+        }),
       fetchFn: params.fetchFn,
       requestFailedMessage: params.requestFailedMessage,
     });
@@ -169,7 +172,7 @@ export async function fetchProviderOperationResponse(params: {
   stage: ProviderOperationRetryStage;
   url: string;
   init?: RequestInit;
-  timeoutMs?: number;
+  timeoutMs?: ProviderOperationTimeoutMs;
   fetchFn: typeof fetch;
   provider?: string;
   requestFailedMessage?: string;
@@ -183,7 +186,7 @@ export async function fetchProviderOperationResponse(params: {
       const response = await fetchWithTimeout(
         params.url,
         params.init ?? {},
-        params.timeoutMs ?? DEFAULT_GUARDED_HTTP_TIMEOUT_MS,
+        resolveProviderOperationRequestTimeoutMs(params.timeoutMs),
         params.fetchFn,
       );
       if (params.requestFailedMessage) {
@@ -197,7 +200,7 @@ export async function fetchProviderOperationResponse(params: {
 export async function fetchProviderDownloadResponse(params: {
   url: string;
   init?: RequestInit;
-  timeoutMs?: number;
+  timeoutMs?: ProviderOperationTimeoutMs;
   fetchFn: typeof fetch;
   provider?: string;
   requestFailedMessage: string;
@@ -215,6 +218,16 @@ export async function fetchProviderDownloadResponse(params: {
   });
 }
 
+function resolveProviderOperationRequestTimeoutMs(
+  timeoutMs: ProviderOperationTimeoutMs | undefined,
+): number {
+  const resolved = typeof timeoutMs === "function" ? timeoutMs() : timeoutMs;
+  if (typeof resolved !== "number" || !Number.isFinite(resolved) || resolved <= 0) {
+    return DEFAULT_GUARDED_HTTP_TIMEOUT_MS;
+  }
+  return resolved;
+}
+
 function resolveGuardedHttpTimeoutMs(timeoutMs: number | undefined): number {
   if (typeof timeoutMs !== "number" || !Number.isFinite(timeoutMs) || timeoutMs <= 0) {
     return DEFAULT_GUARDED_HTTP_TIMEOUT_MS;
diff --git a/src/plugin-sdk/provider-http.ts b/src/plugin-sdk/provider-http.ts
index b3abcd30290..095150563d6 100644
--- a/src/plugin-sdk/provider-http.ts
+++ b/src/plugin-sdk/provider-http.ts
@@ -31,7 +31,10 @@ export {
   sanitizeConfiguredModelProviderRequest,
   waitProviderOperationPollInterval,
 } from "../media-understanding/shared.js";
-export type { ProviderOperationDeadline } from "../media-understanding/shared.js";
+export type {
+  ProviderOperationDeadline,
+  ProviderOperationTimeoutMs,
+} from "../media-understanding/shared.js";
 export {
   executeProviderOperationWithRetry,
   providerOperationRetryConfig,
diff --git a/src/plugin-sdk/test-helpers/provider-http-mocks.ts b/src/plugin-sdk/test-helpers/provider-http-mocks.ts
index 5526aba5693..108009ff9e8 100644
--- a/src/plugin-sdk/test-helpers/provider-http-mocks.ts
+++ b/src/plugin-sdk/test-helpers/provider-http-mocks.ts
@@ -63,12 +63,18 @@ const providerHttpMocks = vi.hoisted(() => ({
   })),
 }));
 
+function resolveMockProviderTimeoutMs(
+  timeoutMs: FetchProviderOperationResponseParams["timeoutMs"],
+) {
+  return typeof timeoutMs === "function" ? timeoutMs() : (timeoutMs ?? 60_000);
+}
+
 providerHttpMocks.fetchProviderOperationResponseMock.mockImplementation(
   async (params: FetchProviderOperationResponseParams) => {
     const response = await providerHttpMocks.fetchWithTimeoutMock(
       params.url,
       params.init ?? {},
-      params.timeoutMs ?? 60_000,
+      resolveMockProviderTimeoutMs(params.timeoutMs),
       params.fetchFn,
     );
     if (params.requestFailedMessage) {
@@ -83,7 +89,7 @@ providerHttpMocks.fetchProviderDownloadResponseMock.mockImplementation(
     const response = await providerHttpMocks.fetchWithTimeoutMock(
       params.url,
       params.init ?? {},
-      params.timeoutMs ?? 60_000,
+      resolveMockProviderTimeoutMs(params.timeoutMs),
       params.fetchFn,
     );
     await providerHttpMocks.assertOkOrThrowHttpErrorMock(response, params.requestFailedMessage);
diff --git a/src/video-generation/dashscope-compatible.ts b/src/video-generation/dashscope-compatible.ts
index 78bcafa71a3..34771934981 100644
--- a/src/video-generation/dashscope-compatible.ts
+++ b/src/video-generation/dashscope-compatible.ts
@@ -182,7 +182,7 @@ export async function pollDashscopeVideoTaskUntilComplete(params: {
         method: "GET",
         headers: params.headers,
       },
-      timeoutMs: resolveProviderOperationTimeoutMs({ deadline, defaultTimeoutMs }),
+      timeoutMs: () => resolveProviderOperationTimeoutMs({ deadline, defaultTimeoutMs }),
       fetchFn: params.fetchFn,
       provider: params.providerLabel,
       requestFailedMessage: `${params.providerLabel} video-generation task poll failed`,