diff --git a/index.d.ts b/index.d.ts
index 78457e0..eabcc9b 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -156,7 +156,7 @@ declare module "replicate" {
       identifier: `${string}/${string}` | `${string}/${string}:${string}`,
       options: {
         input: object;
-        wait?: { interval?: number };
+        wait?: boolean | number | { mode?: "poll"; interval?: number };
         webhook?: string;
         webhook_events_filter?: WebhookEventType[];
         signal?: AbortSignal;
@@ -189,6 +189,7 @@ declare module "replicate" {
     wait(
       prediction: Prediction,
       options?: {
+        mode?: "poll";
         interval?: number;
       },
       stop?: (prediction: Prediction) => Promise<boolean>
@@ -210,9 +211,11 @@ declare module "replicate" {
           deployment_name: string,
           options: {
             input: object;
+            /** @deprecated */
             stream?: boolean;
             webhook?: string;
             webhook_events_filter?: WebhookEventType[];
+            block?: boolean;
           }
         ): Promise<Prediction>;
       };
@@ -301,6 +304,7 @@ declare module "replicate" {
           stream?: boolean;
           webhook?: string;
           webhook_events_filter?: WebhookEventType[];
+          block?: boolean;
         } & ({ version: string } | { model: string })
       ): Promise<Prediction>;
       get(prediction_id: string): Promise<Prediction>;
diff --git a/index.js b/index.js
index f0d3e75..712bc59 100644
--- a/index.js
+++ b/index.js
@@ -133,7 +133,7 @@ class Replicate {
    * @param {string} ref - Required. The model version identifier in the format "owner/name" or "owner/name:version"
    * @param {object} options
    * @param {object} options.input - Required. An object with the model inputs
-   * @param {object} [options.wait] - Options for waiting for the prediction to finish
+   * @param {object} [options.wait] - Options for waiting for the prediction to finish. If `wait` is explicitly true, the function will block and wait for the prediction to finish.
    * @param {number} [options.wait.interval] - Polling interval in milliseconds. Defaults to 500
    * @param {string} [options.webhook] - An HTTPS URL for receiving a webhook when the prediction has new output
    * @param {string[]} [options.webhook_events_filter] - You can change which events trigger webhook requests by specifying webhook events (`start`|`output`|`logs`|`completed`)
@@ -153,11 +153,13 @@ class Replicate {
       prediction = await this.predictions.create({
         ...data,
         version: identifier.version,
+        wait: wait,
       });
     } else if (identifier.owner && identifier.name) {
       prediction = await this.predictions.create({
         ...data,
         model: `${identifier.owner}/${identifier.name}`,
+        wait: wait,
       });
     } else {
       throw new Error("Invalid model version identifier");
diff --git a/lib/deployments.js b/lib/deployments.js
index 56ed240..6cab261 100644
--- a/lib/deployments.js
+++ b/lib/deployments.js
@@ -7,13 +7,13 @@ const { transformFileInputs } = require("./util");
  * @param {string} deployment_name - Required. The name of the deployment
  * @param {object} options
  * @param {object} options.input - Required. An object with the model inputs
- * @param {boolean} [options.stream] - Whether to stream the prediction output. Defaults to false
  * @param {string} [options.webhook] - An HTTPS URL for receiving a webhook when the prediction has new output
  * @param {string[]} [options.webhook_events_filter] - You can change which events trigger webhook requests by specifying webhook events (`start`|`output`|`logs`|`completed`)
+ * @param {boolean} [options.block] - Whether to wait until the prediction is completed before returning. Defaults to false
  * @returns {Promise<object>} Resolves with the created prediction data
  */
 async function createPrediction(deployment_owner, deployment_name, options) {
-  const { stream, input, ...data } = options;
+  const { input, block, ...data } = options;
 
   if (data.webhook) {
     try {
@@ -24,10 +24,16 @@ async function createPrediction(deployment_owner, deployment_name, options) {
     }
   }
 
+  const headers = {};
+  if (block) {
+    headers["Prefer"] = "wait";
+  }
+
   const response = await this.request(
     `/deployments/${deployment_owner}/${deployment_name}/predictions`,
     {
       method: "POST",
+      headers,
       data: {
         ...data,
         input: await transformFileInputs(
@@ -35,7 +41,6 @@ async function createPrediction(deployment_owner, deployment_name, options) {
           input,
           this.fileEncodingStrategy
         ),
-        stream,
       },
     }
   );
diff --git a/lib/predictions.js b/lib/predictions.js
index 88bed32..f8e1c5a 100644
--- a/lib/predictions.js
+++ b/lib/predictions.js
@@ -9,11 +9,11 @@ const { transformFileInputs } = require("./util");
  * @param {object} options.input - Required. An object with the model inputs
  * @param {string} [options.webhook] - An HTTPS URL for receiving a webhook when the prediction has new output
  * @param {string[]} [options.webhook_events_filter] - You can change which events trigger webhook requests by specifying webhook events (`start`|`output`|`logs`|`completed`)
- * @param {boolean} [options.stream] - Whether to stream the prediction output. Defaults to false. Streaming is now enabled by default for all predictions. For more information, see https://replicate.com/changelog/2024-07-15-streams-always-available-stream-parameter-deprecated
+ * @param {boolean|integer} [options.wait] - Whether to wait until the prediction is completed before returning. If an integer is provided, it will wait for that many seconds. Defaults to false
  * @returns {Promise<object>} Resolves with the created prediction
  */
 async function createPrediction(options) {
-  const { model, version, input, ...data } = options;
+  const { model, version, input, wait, ...data } = options;
 
   if (data.webhook) {
     try {
@@ -24,10 +24,21 @@ async function createPrediction(options) {
     }
   }
 
+  const headers = {};
+  if (wait) {
+    if (typeof wait === "number") {
+      const n = Math.max(1, Math.ceil(Number(wait)) || 1);
+      headers["Prefer"] = `wait=${n}`;
+    } else {
+      headers["Prefer"] = "wait";
+    }
+  }
+
   let response;
   if (version) {
     response = await this.request("/predictions", {
       method: "POST",
+      headers,
       data: {
         ...data,
         input: await transformFileInputs(
@@ -41,6 +52,7 @@ async function createPrediction(options) {
   } else if (model) {
     response = await this.request(`/models/${model}/predictions`, {
       method: "POST",
+      headers,
       data: {
         ...data,
         input: await transformFileInputs(