diff --git a/extensions/google/video-generation-provider.test.ts b/extensions/google/video-generation-provider.test.ts
index 72f4090bbf9..3a99ca8502a 100644
--- a/extensions/google/video-generation-provider.test.ts
+++ b/extensions/google/video-generation-provider.test.ts
@@ -116,4 +116,42 @@ describe("google video generation provider", () => {
       }),
     ).rejects.toThrow("Google video generation does not support image and video inputs together.");
   });
+
+  it("rounds unsupported durations to the nearest Veo value", async () => {
+    vi.spyOn(providerAuthRuntime, "resolveApiKeyForProvider").mockResolvedValue({
+      apiKey: "google-key",
+      source: "env",
+      mode: "api-key",
+    });
+    generateVideosMock.mockResolvedValue({
+      done: true,
+      response: {
+        generatedVideos: [
+          {
+            video: {
+              videoBytes: Buffer.from("mp4-bytes").toString("base64"),
+              mimeType: "video/mp4",
+            },
+          },
+        ],
+      },
+    });
+
+    const provider = buildGoogleVideoGenerationProvider();
+    await provider.generateVideo({
+      provider: "google",
+      model: "veo-3.1-fast-generate-preview",
+      prompt: "A tiny robot watering a windowsill garden",
+      cfg: {},
+      durationSeconds: 5,
+    });
+
+    expect(generateVideosMock).toHaveBeenCalledWith(
+      expect.objectContaining({
+        config: expect.objectContaining({
+          durationSeconds: 6,
+        }),
+      }),
+    );
+  });
 });
diff --git a/extensions/google/video-generation-provider.ts b/extensions/google/video-generation-provider.ts
index 036fce173d9..66ade3dc23d 100644
--- a/extensions/google/video-generation-provider.ts
+++ b/extensions/google/video-generation-provider.ts
@@ -15,8 +15,10 @@ const DEFAULT_GOOGLE_VIDEO_MODEL = "veo-3.1-fast-generate-preview";
 const DEFAULT_TIMEOUT_MS = 180_000;
 const POLL_INTERVAL_MS = 10_000;
 const MAX_POLL_ATTEMPTS = 90;
-const GOOGLE_VIDEO_MIN_DURATION_SECONDS = 4;
-const GOOGLE_VIDEO_MAX_DURATION_SECONDS = 8;
+const GOOGLE_VIDEO_ALLOWED_DURATION_SECONDS = [4, 6, 8] as const;
+const GOOGLE_VIDEO_MIN_DURATION_SECONDS = GOOGLE_VIDEO_ALLOWED_DURATION_SECONDS[0];
+const GOOGLE_VIDEO_MAX_DURATION_SECONDS =
+  GOOGLE_VIDEO_ALLOWED_DURATION_SECONDS[GOOGLE_VIDEO_ALLOWED_DURATION_SECONDS.length - 1];
 
 function resolveConfiguredGoogleVideoBaseUrl(req: VideoGenerationRequest): string | undefined {
   const configured = req.cfg?.models?.providers?.google?.baseUrl?.trim();
@@ -75,10 +77,21 @@ function resolveDurationSeconds(durationSeconds: number | undefined): number | u
   if (typeof durationSeconds !== "number" || !Number.isFinite(durationSeconds)) {
     return undefined;
   }
-  return Math.min(
+  const rounded = Math.min(
     GOOGLE_VIDEO_MAX_DURATION_SECONDS,
     Math.max(GOOGLE_VIDEO_MIN_DURATION_SECONDS, Math.round(durationSeconds)),
   );
+  return GOOGLE_VIDEO_ALLOWED_DURATION_SECONDS.reduce((best, current) => {
+    const currentDistance = Math.abs(current - rounded);
+    const bestDistance = Math.abs(best - rounded);
+    if (currentDistance < bestDistance) {
+      return current;
+    }
+    if (currentDistance === bestDistance && current > best) {
+      return current;
+    }
+    return best;
+  });
 }
 
 function resolveInputImage(req: VideoGenerationRequest) {
diff --git a/extensions/minimax/video-generation-provider.test.ts b/extensions/minimax/video-generation-provider.test.ts
index abd58316cd4..27e04d10582 100644
--- a/extensions/minimax/video-generation-provider.test.ts
+++ b/extensions/minimax/video-generation-provider.test.ts
@@ -71,11 +71,15 @@ describe("minimax video generation provider", () => {
       model: "MiniMax-Hailuo-2.3",
       prompt: "A fox sprints across snowy hills",
       cfg: {},
+      durationSeconds: 5,
     });
 
     expect(postJsonRequestMock).toHaveBeenCalledWith(
       expect.objectContaining({
         url: "https://api.minimax.io/v1/video_generation",
+        body: expect.objectContaining({
+          duration: 6,
+        }),
       }),
     );
     expect(result.videos).toHaveLength(1);
diff --git a/extensions/minimax/video-generation-provider.ts b/extensions/minimax/video-generation-provider.ts
index 2e6289d37a8..0dea3a597ff 100644
--- a/extensions/minimax/video-generation-provider.ts
+++ b/extensions/minimax/video-generation-provider.ts
@@ -17,6 +17,10 @@ const DEFAULT_MINIMAX_VIDEO_MODEL = "MiniMax-Hailuo-2.3";
 const DEFAULT_TIMEOUT_MS = 120_000;
 const POLL_INTERVAL_MS = 10_000;
 const MAX_POLL_ATTEMPTS = 90;
+const MINIMAX_MODEL_ALLOWED_DURATIONS: Readonly<Record<string, readonly number[]>> = {
+  "MiniMax-Hailuo-2.3": [6, 10],
+  "MiniMax-Hailuo-02": [6, 10],
+};
 
 type MinimaxBaseResp = {
   status_code?: number;
@@ -85,6 +89,23 @@ function resolveFirstFrameImage(req: VideoGenerationRequest): string | undefined
   return toDataUrl(input.buffer, input.mimeType?.trim() || "image/png");
 }
 
+function resolveDurationSeconds(params: {
+  model: string;
+  durationSeconds: number | undefined;
+}): number | undefined {
+  if (typeof params.durationSeconds !== "number" || !Number.isFinite(params.durationSeconds)) {
+    return undefined;
+  }
+  const rounded = Math.max(1, Math.round(params.durationSeconds));
+  const allowed = MINIMAX_MODEL_ALLOWED_DURATIONS[params.model];
+  if (!allowed || allowed.length === 0) {
+    return rounded;
+  }
+  return allowed.reduce((best, current) =>
+    Math.abs(current - rounded) < Math.abs(best - rounded) ? current : best,
+  );
+}
+
 async function pollMinimaxVideo(params: {
   taskId: string;
   headers: Headers;
@@ -242,8 +263,9 @@ export function buildMinimaxVideoGenerationProvider(): VideoGenerationProvider {
           capability: "video",
           transport: "http",
         });
+      const model = req.model?.trim() || DEFAULT_MINIMAX_VIDEO_MODEL;
       const body: Record<string, unknown> = {
-        model: req.model?.trim() || DEFAULT_MINIMAX_VIDEO_MODEL,
+        model,
         prompt: req.prompt,
       };
       const firstFrameImage = resolveFirstFrameImage(req);
@@ -253,8 +275,12 @@ export function buildMinimaxVideoGenerationProvider(): VideoGenerationProvider {
       if (req.resolution) {
         body.resolution = req.resolution;
       }
-      if (typeof req.durationSeconds === "number" && Number.isFinite(req.durationSeconds)) {
-        body.duration = Math.max(1, Math.round(req.durationSeconds));
+      const durationSeconds = resolveDurationSeconds({
+        model,
+        durationSeconds: req.durationSeconds,
+      });
+      if (typeof durationSeconds === "number") {
+        body.duration = durationSeconds;
       }
       const { response, release } = await postJsonRequest({
         url: `${baseUrl}/v1/video_generation`,
@@ -303,7 +329,7 @@ export function buildMinimaxVideoGenerationProvider(): VideoGenerationProvider {
               })();
         return {
           videos: [video],
-          model: req.model?.trim() || DEFAULT_MINIMAX_VIDEO_MODEL,
+          model,
           metadata: {
             taskId,
             status: completed.status,