diff --git a/src/cloudflare/internal/ai-api.ts b/src/cloudflare/internal/ai-api.ts
index 48045179d2a..bd2d715a632 100644
--- a/src/cloudflare/internal/ai-api.ts
+++ b/src/cloudflare/internal/ai-api.ts
@@ -6,11 +6,18 @@ interface Fetcher {
   fetch: typeof fetch
 }
 
-export type SessionOptions = {  // Deprecated, do not use this
+interface AiError {
+  internalCode: number
+  message: string
+  name: string
+  description: string
+}
+
+export interface SessionOptions {  // Deprecated, do not use this
   extraHeaders?: object;
-};
+}
 
-export type AiOptions = {
+export interface AiOptions {
   debug?: boolean;
   prefix?: string;
   extraHeaders?: object;
@@ -18,12 +25,12 @@ export type AiOptions = {
    * @deprecated this option is deprecated, do not use this
    */
   sessionOptions?: SessionOptions;
-};
+}
 
 export class InferenceUpstreamError extends Error {
-  public constructor(message: string) {
+  public constructor(message: string, name = "InferenceUpstreamError") {
     super(message);
-    this.name = "InferenceUpstreamError";
+    this.name = name;
   }
 }
 
@@ -52,7 +59,7 @@ export class Ai {
     const body = JSON.stringify({
       inputs,
       options: {
-        debug: this.options?.debug,
+        debug: this.options.debug,
       },
     });
 
@@ -60,29 +67,28 @@ export class Ai {
       method: "POST",
       body: body,
       headers: {
-        ...(this.options?.sessionOptions?.extraHeaders || {}),
-        ...(this.options?.extraHeaders || {}),
+        ...(this.options.sessionOptions?.extraHeaders || {}),
+        ...(this.options.extraHeaders || {}),
         "content-type": "application/json",
-        // 'content-encoding': 'gzip',
         "cf-consn-sdk-version": "2.0.0",
         "cf-consn-model-id": `${this.options.prefix ? `${this.options.prefix}:` : ""}${model}`,
       },
     };
 
-    const res = await this.fetcher.fetch("http://workers-binding.ai/run?version=2", fetchOptions);
+    const res = await this.fetcher.fetch("http://workers-binding.ai/run?version=3", fetchOptions);
 
     this.lastRequestId = res.headers.get("cf-ai-req-id");
 
     if (inputs['stream']) {
       if (!res.ok) {
-        throw new InferenceUpstreamError(await res.text());
+        throw await this._parseError(res)
       }
 
       return res.body;
 
     } else {
       if (!res.ok || !res.body) {
-        throw new InferenceUpstreamError(await res.text());
+        throw await this._parseError(res)
       }
 
       const contentType = res.headers.get("content-type");
@@ -98,9 +104,18 @@ export class Ai {
     /*
      * @deprecated this method is deprecated, do not use this
      */
-    public getLogs(): Array<string> {
+    public getLogs(): string[] {
       return []
     }
+
+    private async _parseError(res: Response): Promise<InferenceUpstreamError> {
+      try {
+        const content = (await res.json()) as AiError
+        return new InferenceUpstreamError(`${content.internalCode}: ${content.description}`, content.name);
+      } catch {
+        return new InferenceUpstreamError(await res.text());
+      }
+    }
 }
 
 export default function makeBinding(env: { fetcher: Fetcher }): Ai {
diff --git a/src/cloudflare/internal/d1-api.ts b/src/cloudflare/internal/d1-api.ts
index 4d3386c8793..afc0998675a 100644
--- a/src/cloudflare/internal/d1-api.ts
+++ b/src/cloudflare/internal/d1-api.ts
@@ -6,7 +6,7 @@ interface Fetcher {
   fetch: typeof fetch
 }
 
-type D1Response = {
+interface D1Response {
   success: true
   meta: Record<string, unknown>
   error?: never
@@ -16,11 +16,11 @@ type D1Result<T = unknown> = D1Response & {
   results: T[]
 }
 
-type D1RawOptions = {
+interface D1RawOptions {
   columnNames?: boolean
 }
 
-type D1UpstreamFailure = {
+interface D1UpstreamFailure {
   results?: never
   error: string
   success: false
@@ -41,12 +41,12 @@ type D1UpstreamSuccess<T = unknown> =
 
 type D1UpstreamResponse<T = unknown> = D1UpstreamSuccess<T> | D1UpstreamFailure
 
-type D1ExecResult = {
+interface D1ExecResult {
   count: number
   duration: number
 }
 
-type SQLError = {
+interface SQLError {
   error: string
 }
 
diff --git a/src/cloudflare/internal/sockets.d.ts b/src/cloudflare/internal/sockets.d.ts
index 76dd06732f6..f074541e396 100644
--- a/src/cloudflare/internal/sockets.d.ts
+++ b/src/cloudflare/internal/sockets.d.ts
@@ -12,16 +12,16 @@ export class Socket {
   public startTls(options: TlsOptions): Socket
 }
 
-export type TlsOptions = {
+export interface TlsOptions {
   expectedServerHostname?: string
 }
 
-export type SocketAddress = {
+export interface SocketAddress {
   hostname: string
   port: number
 }
 
-export type SocketOptions = {
+export interface SocketOptions {
   secureTransport?: 'off' | 'on' | 'starttls'
   allowHalfOpen?: boolean
 }
diff --git a/src/cloudflare/internal/test/ai/ai-api-test.js b/src/cloudflare/internal/test/ai/ai-api-test.js
index 97f5a06c5b0..aebb98084e6 100644
--- a/src/cloudflare/internal/test/ai/ai-api-test.js
+++ b/src/cloudflare/internal/test/ai/ai-api-test.js
@@ -4,6 +4,16 @@
 
 import * as assert from 'node:assert'
 
+async function assertThrowsAsynchronously(test, error) {
+    try {
+        await test();
+    } catch(e) {
+        if ()
+            return "everything is fine";
+    }
+    throw new assert.AssertionError("Missing rejection" + (error ? " with "+error.name : ""));
+}
+
 export const tests = {
     async test(_, env) {
         {
@@ -33,5 +43,31 @@ export const tests = {
             })
             assert.deepStrictEqual(await resp.json(),  { response: 'model response' });
         }
+
+        {
+            // Test error response
+            try {
+                await env.ai.run('inputErrorModel', {prompt: 'test'})
+            } catch(e) {
+                assert.deepEqual({
+                    name: e.name, message: e.message
+                }, {
+                  name: 'InvalidInput',
+                  message: '1001: prompt and messages are mutually exclusive',
+                })
+            }
+        }
+
+        {
+            // Test error properties
+            const err = await env.ai._parseError(Response.json({
+                internalCode: 1001,
+                message: "InvalidInput: prompt and messages are mutually exclusive",
+                name: "InvalidInput",
+                description: "prompt and messages are mutually exclusive"
+            }))
+            assert.equal(err.name, 'InvalidInput')
+            assert.equal(err.message, '1001: prompt and messages are mutually exclusive')
+        }
     },
 }
diff --git a/src/cloudflare/internal/test/ai/ai-mock.js b/src/cloudflare/internal/test/ai/ai-mock.js
index ff4cb18e6d9..7b7e1cee197 100644
--- a/src/cloudflare/internal/test/ai/ai-mock.js
+++ b/src/cloudflare/internal/test/ai/ai-mock.js
@@ -21,6 +21,21 @@ export default {
             })
         }
 
+        if (modelName === 'inputErrorModel') {
+            return Response.json({
+                internalCode: 1001,
+                message: "InvalidInput: prompt and messages are mutually exclusive",
+                name: "InvalidInput",
+                description: "prompt and messages are mutually exclusive"
+            }, {
+                status: 400,
+                headers: {
+                    'content-type': 'application/json',
+                    ...respHeaders
+                }
+            })
+        }
+
         return Response.json({response: 'model response'}, {
             headers: {
                 'content-type': 'application/json',
diff --git a/src/cloudflare/internal/vectorize.d.ts b/src/cloudflare/internal/vectorize.d.ts
index 87ea095cdfa..f98f30831c0 100644
--- a/src/cloudflare/internal/vectorize.d.ts
+++ b/src/cloudflare/internal/vectorize.d.ts
@@ -38,17 +38,14 @@ type VectorizeVectorMetadataFilterOp = "$eq" | "$ne";
 /**
  * Filter criteria for vector metadata used to limit the retrieved query result set.
  */
-type VectorizeVectorMetadataFilter = {
-  [field: string]:
-    | Exclude<VectorizeVectorMetadataValue, string[]>
+type VectorizeVectorMetadataFilter = Record<string, | Exclude<VectorizeVectorMetadataValue, string[]>
     | null
     | {
         [Op in VectorizeVectorMetadataFilterOp]?: Exclude<
           VectorizeVectorMetadataValue,
           string[]
         > | null;
-      };
-};
+      }>;
 
 /**
  * Supported distance metrics for an index.