diff --git a/crates/api_clients/seedance2pro_client/src/generate/video/generate_seedance_2p0.rs b/crates/api_clients/seedance2pro_client/src/generate/video/generate_seedance_2p0.rs
index aa5e1769a9..9df1cb0eea 100644
--- a/crates/api_clients/seedance2pro_client/src/generate/video/generate_seedance_2p0.rs
+++ b/crates/api_clients/seedance2pro_client/src/generate/video/generate_seedance_2p0.rs
@@ -38,6 +38,7 @@ pub struct GenerateSeedance2p0Request {
 #[derive(Debug, Clone, Copy)]
 pub enum KinoviSeedance2p0AspectRatio {
   Landscape16x9,
+  UltraWide21x9,
   Portrait9x16,
   Square1x1,
   Standard4x3,
@@ -155,6 +156,7 @@ pub async fn generate_seedance_2p0(
 fn map_aspect_ratio(ar: Option<KinoviSeedance2p0AspectRatio>) -> KinoviAspectRatioRaw {
   match ar {
     Some(KinoviSeedance2p0AspectRatio::Landscape16x9) => KinoviAspectRatioRaw::Landscape16x9,
+    Some(KinoviSeedance2p0AspectRatio::UltraWide21x9) => KinoviAspectRatioRaw::UltraWide21x9,
     Some(KinoviSeedance2p0AspectRatio::Portrait9x16) => KinoviAspectRatioRaw::Portrait9x16,
     Some(KinoviSeedance2p0AspectRatio::Square1x1) => KinoviAspectRatioRaw::Square1x1,
     Some(KinoviSeedance2p0AspectRatio::Standard4x3) => KinoviAspectRatioRaw::Landscape4x3,
@@ -430,6 +432,7 @@ mod tests {
 
       let ratios = [
         KinoviSeedance2p0AspectRatio::Landscape16x9,
+        KinoviSeedance2p0AspectRatio::UltraWide21x9,
         KinoviSeedance2p0AspectRatio::Portrait9x16,
         KinoviSeedance2p0AspectRatio::Square1x1,
         KinoviSeedance2p0AspectRatio::Standard4x3,
@@ -528,6 +531,70 @@ mod tests {
     }
   }
 
+  mod ultra_wide {
+    use super::*;
+
+    #[tokio::test]
+    #[ignore]
+    async fn test_text_to_video_21x9() -> AnyhowResult<()> {
+      setup_test_logging(LevelFilter::Trace);
+      let session = test_session()?;
+      let result = generate_seedance_2p0(GenerateSeedance2p0Args {
+        session: &session,
+        host_override: None,
+        request: GenerateSeedance2p0Request {
+          prompt: "A corgi is riding on the back of a sauropod dinosaur".to_string(),
+          aspect_ratio: Some(KinoviSeedance2p0AspectRatio::UltraWide21x9),
+          output_resolution: None,
+          batch_count: None,
+          duration_seconds: 5,
+          start_frame_url: None,
+          end_frame_url: None,
+          reference_image_urls: None,
+          reference_video_urls: None,
+          reference_audio_urls: None,
+          character_ids: None,
+          use_face_blur_hack: None,
+        },
+      }).await?;
+      println!("t2v 21:9 — task_id={}, order_id={}", result.task_id, result.order_id);
+      assert!(!result.task_id.is_empty());
+      assert_eq!(1, 2);
+      Ok(())
+    }
+
+    #[tokio::test]
+    #[ignore]
+    async fn test_keyframe_21x9() -> AnyhowResult<()> {
+      setup_test_logging(LevelFilter::Trace);
+      let session = test_session()?;
+      let start_frame_url = upload_test_image(&session, test_data::web::image_urls::WIDE_CORGI_SHIBA_TREASURE_OCEAN_URL).await?;
+
+      let result = generate_seedance_2p0(GenerateSeedance2p0Args {
+        session: &session,
+        host_override: None,
+        request: GenerateSeedance2p0Request {
+          prompt: "The dogs sail across the ocean on a treasure ship.".to_string(),
+          aspect_ratio: Some(KinoviSeedance2p0AspectRatio::UltraWide21x9),
+          output_resolution: None,
+          batch_count: None,
+          duration_seconds: 5,
+          start_frame_url: Some(start_frame_url),
+          end_frame_url: None,
+          reference_image_urls: None,
+          reference_video_urls: None,
+          reference_audio_urls: None,
+          character_ids: None,
+          use_face_blur_hack: None,
+        },
+      }).await?;
+      println!("keyframe 21:9 — task_id={}, order_id={}", result.task_id, result.order_id);
+      assert!(!result.task_id.is_empty());
+      assert_eq!(1, 2);
+      Ok(())
+    }
+  }
+
   mod keyframe {
     use super::*;
 
diff --git a/crates/api_clients/seedance2pro_client/src/generate/video/generate_seedance_2p0_fast.rs b/crates/api_clients/seedance2pro_client/src/generate/video/generate_seedance_2p0_fast.rs
index 2047b1fb1e..9cc06e43aa 100644
--- a/crates/api_clients/seedance2pro_client/src/generate/video/generate_seedance_2p0_fast.rs
+++ b/crates/api_clients/seedance2pro_client/src/generate/video/generate_seedance_2p0_fast.rs
@@ -38,6 +38,7 @@ pub struct GenerateSeedance2p0FastRequest {
 #[derive(Debug, Clone, Copy)]
 pub enum KinoviSeedance2p0FastAspectRatio {
   Landscape16x9,
+  UltraWide21x9,
   Portrait9x16,
   Square1x1,
   Standard4x3,
@@ -152,6 +153,7 @@ pub async fn generate_seedance_2p0_fast(
 fn map_aspect_ratio(ar: Option<KinoviSeedance2p0FastAspectRatio>) -> KinoviAspectRatioRaw {
   match ar {
     Some(KinoviSeedance2p0FastAspectRatio::Landscape16x9) => KinoviAspectRatioRaw::Landscape16x9,
+    Some(KinoviSeedance2p0FastAspectRatio::UltraWide21x9) => KinoviAspectRatioRaw::UltraWide21x9,
     Some(KinoviSeedance2p0FastAspectRatio::Portrait9x16) => KinoviAspectRatioRaw::Portrait9x16,
     Some(KinoviSeedance2p0FastAspectRatio::Square1x1) => KinoviAspectRatioRaw::Square1x1,
     Some(KinoviSeedance2p0FastAspectRatio::Standard4x3) => KinoviAspectRatioRaw::Landscape4x3,
@@ -382,6 +384,7 @@ mod tests {
 
       let ratios = [
         KinoviSeedance2p0FastAspectRatio::Landscape16x9,
+        KinoviSeedance2p0FastAspectRatio::UltraWide21x9,
         KinoviSeedance2p0FastAspectRatio::Portrait9x16,
         KinoviSeedance2p0FastAspectRatio::Square1x1,
         KinoviSeedance2p0FastAspectRatio::Standard4x3,
@@ -480,6 +483,70 @@ mod tests {
     }
   }
 
+  mod ultra_wide {
+    use super::*;
+
+    #[tokio::test]
+    #[ignore]
+    async fn test_text_to_video_21x9() -> AnyhowResult<()> {
+      setup_test_logging(LevelFilter::Trace);
+      let session = test_session()?;
+      let result = generate_seedance_2p0_fast(GenerateSeedance2p0FastArgs {
+        session: &session,
+        host_override: None,
+        request: GenerateSeedance2p0FastRequest {
+          prompt: "A shiba is riding on the back of a sauropod dinosaur".to_string(),
+          aspect_ratio: Some(KinoviSeedance2p0FastAspectRatio::UltraWide21x9),
+          output_resolution: Some(KinoviSeedance2p0FastOutputResolution::FourEightyP),
+          batch_count: None,
+          duration_seconds: 5,
+          start_frame_url: None,
+          end_frame_url: None,
+          reference_image_urls: None,
+          reference_video_urls: None,
+          reference_audio_urls: None,
+          character_ids: None,
+          use_face_blur_hack: None,
+        },
+      }).await?;
+      println!("fast t2v 21:9 480p — task_id={}, order_id={}", result.task_id, result.order_id);
+      assert!(!result.task_id.is_empty());
+      assert_eq!(1, 2);
+      Ok(())
+    }
+
+    #[tokio::test]
+    #[ignore]
+    async fn test_keyframe_21x9() -> AnyhowResult<()> {
+      setup_test_logging(LevelFilter::Trace);
+      let session = test_session()?;
+      let start_frame_url = upload_test_image(&session, test_data::web::image_urls::WIDE_CORGI_SHIBA_TREASURE_OCEAN_URL).await?;
+
+      let result = generate_seedance_2p0_fast(GenerateSeedance2p0FastArgs {
+        session: &session,
+        host_override: None,
+        request: GenerateSeedance2p0FastRequest {
+          prompt: "The dogs in @1 set sail across the ocean on a treasure ship.".to_string(),
+          aspect_ratio: Some(KinoviSeedance2p0FastAspectRatio::UltraWide21x9),
+          output_resolution: None,
+          batch_count: None,
+          duration_seconds: 5,
+          start_frame_url: None,
+          end_frame_url: None,
+          reference_image_urls: None,
+          reference_video_urls: Some(vec![start_frame_url]),
+          reference_audio_urls: None,
+          character_ids: None,
+          use_face_blur_hack: None,
+        },
+      }).await?;
+      println!("fast keyframe 21:9 — task_id={}, order_id={}", result.task_id, result.order_id);
+      assert!(!result.task_id.is_empty());
+      assert_eq!(1, 2);
+      Ok(())
+    }
+  }
+
   mod keyframe {
     use super::*;
 
diff --git a/crates/api_clients/seedance2pro_client/src/requests/generate_video/generate_video.rs b/crates/api_clients/seedance2pro_client/src/requests/generate_video/generate_video.rs
index aacbf351ea..38f186809f 100644
--- a/crates/api_clients/seedance2pro_client/src/requests/generate_video/generate_video.rs
+++ b/crates/api_clients/seedance2pro_client/src/requests/generate_video/generate_video.rs
@@ -172,6 +172,8 @@ impl KinoviGenerateVideoRequest {
 pub enum KinoviAspectRatio {
   /// 16:9 landscape (1280x720)
   Landscape16x9,
+  /// 21:9 ultra-wide (1280x540)
+  UltraWide21x9,
   /// 9:16 portrait (720x1280)
   Portrait9x16,
   /// 1:1 square (720x720)
@@ -186,6 +188,7 @@ impl KinoviAspectRatio {
   fn as_str(&self) -> &'static str {
     match self {
       Self::Landscape16x9 => "1280x720",
+      Self::UltraWide21x9 => "1280x540",
       Self::Portrait9x16 => "720x1280",
       Self::Square1x1 => "720x720",
       Self::Standard4x3 => "960x720",
diff --git a/crates/api_clients/seedance2pro_client/src/requests/workflow_run_task/workflow_run_task.rs b/crates/api_clients/seedance2pro_client/src/requests/workflow_run_task/workflow_run_task.rs
index 1b44d3fe56..9c35e31b64 100644
--- a/crates/api_clients/seedance2pro_client/src/requests/workflow_run_task/workflow_run_task.rs
+++ b/crates/api_clients/seedance2pro_client/src/requests/workflow_run_task/workflow_run_task.rs
@@ -181,6 +181,8 @@ impl WorkflowRunTaskRequest {
 pub enum KinoviAspectRatioRaw {
   /// 16:9 landscape (1280x720)
   Landscape16x9,
+  /// 21:9 ultra-wide (1280x540)
+  UltraWide21x9,
   /// 9:16 portrait (720x1280)
   Portrait9x16,
   /// 1:1 square (720x720)
@@ -195,6 +197,7 @@ impl KinoviAspectRatioRaw {
   fn as_str(&self) -> &'static str {
     match self {
       Self::Landscape16x9 => "1280x720",
+      Self::UltraWide21x9 => "1280x540",
       Self::Portrait9x16 => "720x1280",
       Self::Square1x1 => "720x720",
       Self::Landscape4x3 => "960x720",