feat: add Seedance 2.0 and 2.0 Fast video models

Add Seedance 2.0 and 2.0 Fast with text-to-video and image-to-video
variants. Both support audio generation, web search, and 4-15 second
duration. Image input uses first_frame_url (singular string).

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/app/api/generate/providers/kie.ts

@@ -97,6 +97,19 @@ export function getKieModelDefaults(modelId: string): Record<string, unknown> {
     case "grok-imagine/image-to-image":
       return {};
 
+    // Seedance 2.0 models
+    case "bytedance/seedance-2/text-to-video":
+    case "bytedance/seedance-2/image-to-video":
+    case "bytedance/seedance-2-fast/text-to-video":
+    case "bytedance/seedance-2-fast/image-to-video":
+      return {
+        aspect_ratio: "16:9",
+        resolution: "720p",
+        duration: 8,
+        generate_audio: true,
+        web_search: false,
+      };
+
     // Grok Imagine video models
     case "grok-imagine/text-to-video":
       return {
@@ -199,6 +212,8 @@ export function getKieImageInputKey(modelId: string): string {
   if (modelId === "flux-2/pro-image-to-image" || modelId === "flux-2/flex-image-to-image") return "input_urls";
   // Wan 2.7 Image uses input_urls
   if (modelId === "wan/2-7-image") return "input_urls";
+  // Seedance I2V models use first_frame_url (singular)
+  if (modelId === "bytedance/seedance-2/image-to-video" || modelId === "bytedance/seedance-2-fast/image-to-video") return "first_frame_url";
   // Kling 2.5 turbo I2V uses singular image_url
   if (modelId === "kling/v2-5-turbo-image-to-video-pro") return "image_url";
   // Kling 2.6 motion control uses input_urls

src/app/api/models/[modelId]/route.ts

@@ -858,6 +858,56 @@ function getKieSchema(modelId: string): ExtractedSchema {
       inputs: [{ name: "prompt", type: "text", required: true, label: "Sound Description" }],
     },
     // ============ Video models ============
+    "bytedance/seedance-2/text-to-video": {
+      parameters: [
+        { name: "aspect_ratio", type: "string", description: "Output aspect ratio", enum: ["16:9", "9:16", "1:1"], default: "16:9" },
+        { name: "resolution", type: "string", description: "Output resolution", enum: ["720p", "1080p"], default: "720p" },
+        { name: "duration", type: "integer", description: "Video duration in seconds (4-15)", default: 8, minimum: 4, maximum: 15 },
+        { name: "generate_audio", type: "boolean", description: "Generate audio with the video", default: true },
+        { name: "web_search", type: "boolean", description: "Enable web search for prompt enhancement", default: false },
+        { name: "seed", type: "integer", description: "Random seed for reproducibility", minimum: 0 },
+      ],
+      inputs: [{ name: "prompt", type: "text", required: true, label: "Prompt" }],
+    },
+    "bytedance/seedance-2/image-to-video": {
+      parameters: [
+        { name: "aspect_ratio", type: "string", description: "Output aspect ratio", enum: ["16:9", "9:16", "1:1"], default: "16:9" },
+        { name: "resolution", type: "string", description: "Output resolution", enum: ["720p", "1080p"], default: "720p" },
+        { name: "duration", type: "integer", description: "Video duration in seconds (4-15)", default: 8, minimum: 4, maximum: 15 },
+        { name: "generate_audio", type: "boolean", description: "Generate audio with the video", default: true },
+        { name: "web_search", type: "boolean", description: "Enable web search for prompt enhancement", default: false },
+        { name: "seed", type: "integer", description: "Random seed for reproducibility", minimum: 0 },
+      ],
+      inputs: [
+        { name: "prompt", type: "text", required: false, label: "Prompt" },
+        { name: "first_frame_url", type: "image", required: true, label: "Image" },
+      ],
+    },
+    "bytedance/seedance-2-fast/text-to-video": {
+      parameters: [
+        { name: "aspect_ratio", type: "string", description: "Output aspect ratio", enum: ["16:9", "9:16", "1:1"], default: "16:9" },
+        { name: "resolution", type: "string", description: "Output resolution", enum: ["720p", "1080p"], default: "720p" },
+        { name: "duration", type: "integer", description: "Video duration in seconds (4-15)", default: 8, minimum: 4, maximum: 15 },
+        { name: "generate_audio", type: "boolean", description: "Generate audio with the video", default: true },
+        { name: "web_search", type: "boolean", description: "Enable web search for prompt enhancement", default: false },
+        { name: "seed", type: "integer", description: "Random seed for reproducibility", minimum: 0 },
+      ],
+      inputs: [{ name: "prompt", type: "text", required: true, label: "Prompt" }],
+    },
+    "bytedance/seedance-2-fast/image-to-video": {
+      parameters: [
+        { name: "aspect_ratio", type: "string", description: "Output aspect ratio", enum: ["16:9", "9:16", "1:1"], default: "16:9" },
+        { name: "resolution", type: "string", description: "Output resolution", enum: ["720p", "1080p"], default: "720p" },
+        { name: "duration", type: "integer", description: "Video duration in seconds (4-15)", default: 8, minimum: 4, maximum: 15 },
+        { name: "generate_audio", type: "boolean", description: "Generate audio with the video", default: true },
+        { name: "web_search", type: "boolean", description: "Enable web search for prompt enhancement", default: false },
+        { name: "seed", type: "integer", description: "Random seed for reproducibility", minimum: 0 },
+      ],
+      inputs: [
+        { name: "prompt", type: "text", required: false, label: "Prompt" },
+        { name: "first_frame_url", type: "image", required: true, label: "Image" },
+      ],
+    },
     "grok-imagine/text-to-video": {
       parameters: [
         { name: "aspect_ratio", type: "string", description: "Output aspect ratio", enum: ["2:3", "3:2", "1:1", "16:9", "9:16"], default: "2:3" },

src/app/api/models/route.ts

@@ -236,7 +236,43 @@ const KIE_MODELS: ProviderModel[] = [
     coverImage: undefined,
     pageUrl: "https://kie.ai/grok-imagine",
   },
-  // ============ Video Models (11) ============
+  // ============ Video Models ============
+  {
+    id: "bytedance/seedance-2/text-to-video",
+    name: "Seedance 2.0",
+    description: "ByteDance Seedance 2.0 text-to-video generation via Kie.ai. Supports audio generation and web search.",
+    provider: "kie",
+    capabilities: ["text-to-video"],
+    coverImage: undefined,
+    pageUrl: "https://docs.kie.ai/market/bytedance/seedance-2",
+  },
+  {
+    id: "bytedance/seedance-2/image-to-video",
+    name: "Seedance 2.0 I2V",
+    description: "ByteDance Seedance 2.0 image-to-video generation via Kie.ai. Supports audio generation and web search.",
+    provider: "kie",
+    capabilities: ["image-to-video"],
+    coverImage: undefined,
+    pageUrl: "https://docs.kie.ai/market/bytedance/seedance-2",
+  },
+  {
+    id: "bytedance/seedance-2-fast/text-to-video",
+    name: "Seedance 2.0 Fast",
+    description: "ByteDance Seedance 2.0 Fast text-to-video generation via Kie.ai. Supports audio generation and web search.",
+    provider: "kie",
+    capabilities: ["text-to-video"],
+    coverImage: undefined,
+    pageUrl: "https://docs.kie.ai/market/bytedance/seedance-2-fast",
+  },
+  {
+    id: "bytedance/seedance-2-fast/image-to-video",
+    name: "Seedance 2.0 Fast I2V",
+    description: "ByteDance Seedance 2.0 Fast image-to-video generation via Kie.ai. Supports audio generation and web search.",
+    provider: "kie",
+    capabilities: ["image-to-video"],
+    coverImage: undefined,
+    pageUrl: "https://docs.kie.ai/market/bytedance/seedance-2-fast",
+  },
   {
     id: "grok-imagine/text-to-video",
     name: "Grok Imagine Video",