diff --git a/dist/index.js b/dist/index.js
index 135b95946139bbd1fc4b62239032931586189da0..7913520ad2f1c26b0f9621e7654f5fb570cba926 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -1077,6 +1077,20 @@ async function convertToXaiResponsesInput({
                 const mediaType = block.mediaType === "image/*" ? "image/jpeg" : block.mediaType;
                 const imageUrl = block.data instanceof URL ? block.data.toString() : `data:${mediaType};base64,${(0, import_provider_utils5.convertToBase64)(block.data)}`;
                 contentParts.push({ type: "input_image", image_url: imageUrl });
+              } else if (block.mediaType === "application/pdf") {
+                if (block.data instanceof URL) {
+                  contentParts.push({ type: "input_file", file_url: block.data.toString() });
+                } else {
+                  contentParts.push({
+                    type: "input_file",
+                    ...(typeof block.data === "string" && block.data.startsWith("file-")
+                      ? { file_id: block.data }
+                      : {
+                          filename: block.filename ?? "file",
+                          file_data: `data:application/pdf;base64,${(0, import_provider_utils5.convertToBase64)(block.data)}`,
+                        }),
+                  });
+                }
               } else {
                 throw new import_provider4.UnsupportedFunctionalityError({
                   functionality: `file part media type ${block.mediaType}`
diff --git a/dist/index.mjs b/dist/index.mjs
index 61be60d452682b94dcdda39ffc47cb994eb8bfb1..d928f7f46e91057cd97fade9cc238db611345bcf 100644
--- a/dist/index.mjs
+++ b/dist/index.mjs
@@ -1080,6 +1080,20 @@ async function convertToXaiResponsesInput({
                 const mediaType = block.mediaType === "image/*" ? "image/jpeg" : block.mediaType;
                 const imageUrl = block.data instanceof URL ? block.data.toString() : `data:${mediaType};base64,${convertToBase642(block.data)}`;
                 contentParts.push({ type: "input_image", image_url: imageUrl });
+              } else if (block.mediaType === "application/pdf") {
+                if (block.data instanceof URL) {
+                  contentParts.push({ type: "input_file", file_url: block.data.toString() });
+                } else {
+                  contentParts.push({
+                    type: "input_file",
+                    ...(typeof block.data === "string" && block.data.startsWith("file-")
+                      ? { file_id: block.data }
+                      : {
+                          filename: block.filename ?? "file",
+                          file_data: `data:application/pdf;base64,${convertToBase642(block.data)}`,
+                        }),
+                  });
+                }
               } else {
                 throw new UnsupportedFunctionalityError3({
                   functionality: `file part media type ${block.mediaType}`
diff --git a/src/responses/convert-to-xai-responses-input.ts b/src/responses/convert-to-xai-responses-input.ts
index 19958d9fd90f7ce61bca70ad2d5f7b89a59fa63b..9329a1d56210af8aa33e5dbcb2916e24847070c1 100644
--- a/src/responses/convert-to-xai-responses-input.ts
+++ b/src/responses/convert-to-xai-responses-input.ts
@@ -54,6 +54,24 @@ export async function convertToXaiResponsesInput({
                     : `data:${mediaType};base64,${convertToBase64(block.data)}`;
 
                 contentParts.push({ type: 'input_image', image_url: imageUrl });
+              } else if (block.mediaType === 'application/pdf') {
+                if (block.data instanceof URL) {
+                  contentParts.push({
+                    type: 'input_file',
+                    file_url: block.data.toString(),
+                  });
+                } else {
+                  contentParts.push({
+                    type: 'input_file',
+                    ...(typeof block.data === 'string' &&
+                    block.data.startsWith('file-')
+                      ? { file_id: block.data }
+                      : {
+                          filename: block.filename ?? 'file',
+                          file_data: `data:application/pdf;base64,${convertToBase64(block.data)}`,
+                        }),
+                  });
+                }
               } else {
                 throw new UnsupportedFunctionalityError({
                   functionality: `file part media type ${block.mediaType}`,
diff --git a/src/responses/xai-responses-api.ts b/src/responses/xai-responses-api.ts
index df24c42d29fe7fc1dd7649cc2c4712a68c3a536b..00195468a83d43c1bfb50854ea040b55ea352433 100644
--- a/src/responses/xai-responses-api.ts
+++ b/src/responses/xai-responses-api.ts
@@ -26,7 +26,14 @@ export type XaiResponsesSystemMessage = {
 
 export type XaiResponsesUserMessageContentPart =
   | { type: 'input_text'; text: string }
-  | { type: 'input_image'; image_url: string };
+  | { type: 'input_image'; image_url: string }
+  | {
+      type: 'input_file';
+      file_url?: string;
+      file_id?: string;
+      file_data?: string;
+      filename?: string;
+    };
 
 export type XaiResponsesUserMessage = {
   role: 'user';