diff --git a/docs/core_docs/docs/how_to/graph_constructing.ipynb b/docs/core_docs/docs/how_to/graph_constructing.ipynb
index dfee57df8191..2df65144e104 100644
--- a/docs/core_docs/docs/how_to/graph_constructing.ipynb
+++ b/docs/core_docs/docs/how_to/graph_constructing.ipynb
@@ -102,7 +102,7 @@
         "\n",
         "const model = new ChatOpenAI({\n",
         "    temperature: 0,\n",
-        "    model: \"gpt-4-turbo-preview\",\n",
+        "    model: \"gpt-4o-mini\",\n",
         "});\n",
         "\n",
         "const llmGraphTransformer = new LLMGraphTransformer({\n",
diff --git a/docs/core_docs/docs/how_to/query_high_cardinality.ipynb b/docs/core_docs/docs/how_to/query_high_cardinality.ipynb
index 589f4e2cc933..804a5ebc7e58 100644
--- a/docs/core_docs/docs/how_to/query_high_cardinality.ipynb
+++ b/docs/core_docs/docs/how_to/query_high_cardinality.ipynb
@@ -392,7 +392,7 @@
       "metadata": {},
       "source": [
         "```{=mdx}\n",
-        "<ChatModelTabs customVarName=\"llmLong\" openaiParams={`{ model: \"gpt-4-turbo-preview\" }`} />\n",
+        "<ChatModelTabs customVarName=\"llmLong\" openaiParams={`{ model: \"gpt-4o-mini\" }`} />\n",
         "```"
       ]
     },
@@ -635,4 +635,4 @@
   },
   "nbformat": 4,
   "nbformat_minor": 5
-}
\ No newline at end of file
+}
diff --git a/examples/src/models/chat/integration_openai_wsa_json_schema.ts b/examples/src/models/chat/integration_openai_wsa_json_schema.ts
index d21bc3a1d490..2370cbdcf79f 100644
--- a/examples/src/models/chat/integration_openai_wsa_json_schema.ts
+++ b/examples/src/models/chat/integration_openai_wsa_json_schema.ts
@@ -3,7 +3,7 @@ import { ChatOpenAI } from "@langchain/openai";
 
 const model = new ChatOpenAI({
   temperature: 0,
-  model: "gpt-4-turbo-preview",
+  model: "gpt-4o-mini",
 });
 
 const calculatorSchema = {
diff --git a/examples/src/models/chat/integration_openai_wsa_zod.ts b/examples/src/models/chat/integration_openai_wsa_zod.ts
index 64d83b00b6ad..3b29af39cdb8 100644
--- a/examples/src/models/chat/integration_openai_wsa_zod.ts
+++ b/examples/src/models/chat/integration_openai_wsa_zod.ts
@@ -4,7 +4,7 @@ import { z } from "zod";
 
 const model = new ChatOpenAI({
   temperature: 0,
-  model: "gpt-4-turbo-preview",
+  model: "gpt-4o-mini",
 });
 
 const calculatorSchema = z.object({
diff --git a/examples/src/tools/duckduckgo_search_agent.ts b/examples/src/tools/duckduckgo_search_agent.ts
index 90b0d549ac12..f2a29ed4f25f 100644
--- a/examples/src/tools/duckduckgo_search_agent.ts
+++ b/examples/src/tools/duckduckgo_search_agent.ts
@@ -15,7 +15,7 @@ const prompt = await pull<ChatPromptTemplate>(
   "hwchase17/openai-functions-agent"
 );
 const llm = new ChatOpenAI({
-  model: "gpt-4-turbo-preview",
+  model: "gpt-4o-mini",
   temperature: 0,
 });
 const agent = await createOpenAIFunctionsAgent({
diff --git a/libs/langchain-openai/src/chat_models.ts b/libs/langchain-openai/src/chat_models.ts
index 3bd3a4e5ee57..91023c5561b6 100644
--- a/libs/langchain-openai/src/chat_models.ts
+++ b/libs/langchain-openai/src/chat_models.ts
@@ -2035,24 +2035,7 @@ export class ChatOpenAI<
       } else {
         outputParser = new JsonOutputParser<RunOutput>();
       }
-    } else if (method === "jsonSchema") {
-      llm = this.bind({
-        response_format: {
-          type: "json_schema",
-          json_schema: {
-            name: name ?? "extract",
-            description: schema.description,
-            schema,
-            strict: config?.strict,
-          },
-        },
-      } as Partial<CallOptions>);
-      if (isZodSchema(schema)) {
-        outputParser = StructuredOutputParser.fromZodSchema(schema);
-      } else {
-        outputParser = new JsonOutputParser<RunOutput>();
-      }
-    } else {
+    } else if (method === "tool_calling") {
       let functionName = name ?? "extract";
       // Is function calling
       if (isZodSchema(schema)) {
@@ -2120,6 +2103,25 @@ export class ChatOpenAI<
           keyName: functionName,
         });
       }
+    } else {
+      let finalSchema = schema;
+      if (!isZodSchema(schema)) {
+        if (schema.parameters !== undefined) {
+          finalSchema = schema.parameters;
+        }
+      }
+      llm = this.bind({
+        response_format: {
+          type: "json_schema",
+          json_schema: {
+            name: name ?? "extract",
+            description: schema.description,
+            schema: finalSchema,
+            strict: config?.strict ?? true,
+          },
+        },
+      } as Partial<CallOptions>);
+      outputParser = new JsonOutputParser<RunOutput>();
     }
 
     if (!includeRaw) {
diff --git a/libs/langchain-openai/src/tests/chat_models.standard.int.test.ts b/libs/langchain-openai/src/tests/chat_models.standard.int.test.ts
index 1dd34509ed04..32993f949f14 100644
--- a/libs/langchain-openai/src/tests/chat_models.standard.int.test.ts
+++ b/libs/langchain-openai/src/tests/chat_models.standard.int.test.ts
@@ -26,7 +26,7 @@ class ChatOpenAIStandardIntegrationTests extends ChatModelIntegrationTests<
       chatModelHasStructuredOutput: true,
       supportsParallelToolCalls: true,
       constructorArgs: {
-        model: "gpt-3.5-turbo",
+        model: "gpt-4o-mini",
       },
     });
   }
diff --git a/libs/langchain-openai/src/tests/chat_models_structured_output.int.test.ts b/libs/langchain-openai/src/tests/chat_models_structured_output.int.test.ts
index 36590c636d36..96ca0a989b8a 100644
--- a/libs/langchain-openai/src/tests/chat_models_structured_output.int.test.ts
+++ b/libs/langchain-openai/src/tests/chat_models_structured_output.int.test.ts
@@ -6,10 +6,10 @@ import { test, expect, describe, it } from "@jest/globals";
 import { concat } from "@langchain/core/utils/stream";
 import { ChatOpenAI } from "../chat_models.js";
 
-test("withStructuredOutput zod schema function calling", async () => {
+test("withStructuredOutput with zod schema", async () => {
   const model = new ChatOpenAI({
     temperature: 0,
-    modelName: "gpt-4-turbo-preview",
+    modelName: "gpt-4o-mini",
   });
 
   const calculatorSchema = z.object({
@@ -65,10 +65,44 @@ test("withStructuredOutput with o1", async () => {
   expect("number2" in result).toBe(true);
 });
 
+test.only("withStructuredOutput with optional properties", async () => {
+  const model = new ChatOpenAI({
+    model: "o1",
+  });
+
+  const calculatorSchema = z.object({
+    operation: z.enum(["add", "subtract", "multiply", "divide"]),
+    number1: z.number(),
+    number2: z.number(),
+    number3: z.nullable(z.number()),
+  });
+  const modelWithStructuredOutput = model.withStructuredOutput(
+    calculatorSchema,
+    {
+      name: "calculator",
+    }
+  );
+
+  const prompt = ChatPromptTemplate.fromMessages([
+    [
+      "developer",
+      "You are VERY bad at math and must always use a calculator. Do not supply any additional numbers.",
+    ],
+    ["human", "Please help me!! What is 2 + 2?"],
+  ]);
+  const chain = prompt.pipe(modelWithStructuredOutput);
+  const result = await chain.invoke({});
+  console.log(result);
+  expect("operation" in result).toBe(true);
+  expect("number1" in result).toBe(true);
+  expect("number2" in result).toBe(true);
+  expect(result.number3).toBe(null);
+});
+
 test("withStructuredOutput zod schema streaming", async () => {
   const model = new ChatOpenAI({
     temperature: 0,
-    modelName: "gpt-4-turbo-preview",
+    modelName: "gpt-4o-mini",
   });
 
   const calculatorSchema = z.object({
@@ -91,6 +125,7 @@ test("withStructuredOutput zod schema streaming", async () => {
   const stream = await chain.stream({});
   const chunks = [];
   for await (const chunk of stream) {
+    console.log(chunk);
     chunks.push(chunk);
   }
   expect(chunks.length).toBeGreaterThan(1);
@@ -103,7 +138,7 @@ test("withStructuredOutput zod schema streaming", async () => {
 test("withStructuredOutput zod schema JSON mode", async () => {
   const model = new ChatOpenAI({
     temperature: 0,
-    modelName: "gpt-4-turbo-preview",
+    modelName: "gpt-4o-mini",
   });
 
   const calculatorSchema = z.object({
@@ -139,10 +174,10 @@ Respond with a JSON object containing three keys:
   expect("number2" in result).toBe(true);
 });
 
-test("withStructuredOutput JSON schema function calling", async () => {
+test("withStructuredOutput with JSON schema", async () => {
   const model = new ChatOpenAI({
     temperature: 0,
-    modelName: "gpt-4-turbo-preview",
+    modelName: "gpt-4o-mini",
   });
 
   const calculatorSchema = z.object({
@@ -167,10 +202,10 @@ test("withStructuredOutput JSON schema function calling", async () => {
   expect("number2" in result).toBe(true);
 });
 
-test("withStructuredOutput OpenAI function definition function calling", async () => {
+test("withStructuredOutput OpenAI with function definition", async () => {
   const model = new ChatOpenAI({
     temperature: 0,
-    modelName: "gpt-4-turbo-preview",
+    modelName: "gpt-4o-mini",
   });
 
   const calculatorSchema = z.object({
@@ -198,7 +233,7 @@ test("withStructuredOutput OpenAI function definition function calling", async (
 test("withStructuredOutput JSON schema JSON mode", async () => {
   const model = new ChatOpenAI({
     temperature: 0,
-    modelName: "gpt-4-turbo-preview",
+    modelName: "gpt-4o-mini",
   });
 
   const calculatorSchema = z.object({
@@ -237,7 +272,7 @@ Respond with a JSON object containing three keys:
 test("withStructuredOutput JSON schema", async () => {
   const model = new ChatOpenAI({
     temperature: 0,
-    modelName: "gpt-4-turbo-preview",
+    modelName: "gpt-4o-mini",
   });
 
   const jsonSchema = {
@@ -252,6 +287,8 @@ test("withStructuredOutput JSON schema", async () => {
       number1: { type: "number" },
       number2: { type: "number" },
     },
+    required: ["operation", "number1", "number2"],
+    additionalProperties: false,
   };
   const modelWithStructuredOutput = model.withStructuredOutput(jsonSchema);
 
@@ -278,7 +315,7 @@ Respond with a JSON object containing three keys:
 test("withStructuredOutput includeRaw true", async () => {
   const model = new ChatOpenAI({
     temperature: 0,
-    modelName: "gpt-4-turbo-preview",
+    modelName: "gpt-4o-mini",
   });
 
   const calculatorSchema = z.object({
@@ -318,22 +355,10 @@ test("withStructuredOutput includeRaw true", async () => {
     throw new Error("raw not in result");
   }
   const { raw } = result as { raw: AIMessage };
-  expect(raw.additional_kwargs.tool_calls?.length).toBeGreaterThan(0);
-  expect(raw.additional_kwargs.tool_calls?.[0].function.name).toBe(
-    "calculator"
-  );
-  expect(
-    "operation" in
-      JSON.parse(raw.additional_kwargs.tool_calls?.[0].function.arguments ?? "")
-  ).toBe(true);
-  expect(
-    "number1" in
-      JSON.parse(raw.additional_kwargs.tool_calls?.[0].function.arguments ?? "")
-  ).toBe(true);
-  expect(
-    "number2" in
-      JSON.parse(raw.additional_kwargs.tool_calls?.[0].function.arguments ?? "")
-  ).toBe(true);
+  console.log(raw);
+  expect("operation" in JSON.parse(raw.content as string)).toBe(true);
+  expect("number1" in JSON.parse(raw.content as string)).toBe(true);
+  expect("number2" in JSON.parse(raw.content as string)).toBe(true);
 });
 
 test("parallelToolCalls param", async () => {