diff --git a/langchain-core/src/language_models/chat_models.ts b/langchain-core/src/language_models/chat_models.ts
index 34484da1ae34..82b83056ddd6 100644
--- a/langchain-core/src/language_models/chat_models.ts
+++ b/langchain-core/src/language_models/chat_models.ts
@@ -80,6 +80,15 @@ export function createChatMessageChunkEncoderStream() {
   });
 }
 
+export type LangSmithParams = {
+  ls_provider?: string;
+  ls_model_name?: string;
+  ls_model_type: "chat";
+  ls_temperature?: number;
+  ls_max_tokens?: number;
+  ls_stop?: Array<string>;
+};
+
 interface ChatModelGenerateCachedParameters<
   T extends BaseChatModel<CallOptions>,
   CallOptions extends BaseChatModelCallOptions = BaseChatModelCallOptions
@@ -185,12 +194,17 @@ export abstract class BaseChatModel<
       const messages = prompt.toChatMessages();
       const [runnableConfig, callOptions] =
         this._separateRunnableConfigFromCallOptions(options);
+
+      const inheritableMetadata = {
+        ...runnableConfig.metadata,
+        ...this.getLsParams(callOptions),
+      };
       const callbackManager_ = await CallbackManager.configure(
         runnableConfig.callbacks,
         this.callbacks,
         runnableConfig.tags,
         this.tags,
-        runnableConfig.metadata,
+        inheritableMetadata,
         this.metadata,
         { verbose: this.verbose }
       );
@@ -246,6 +260,13 @@ export abstract class BaseChatModel<
     }
   }
 
+  protected getLsParams(options: this["ParsedCallOptions"]): LangSmithParams {
+    return {
+      ls_model_type: "chat",
+      ls_stop: options.stop,
+    };
+  }
+
   /** @ignore */
   async _generateUncached(
     messages: BaseMessageLike[][],
@@ -256,13 +277,17 @@ export abstract class BaseChatModel<
       messageList.map(coerceMessageLikeToMessage)
     );
 
+    const inheritableMetadata = {
+      ...handledOptions.metadata,
+      ...this.getLsParams(parsedOptions),
+    };
     // create callback manager and start run
     const callbackManager_ = await CallbackManager.configure(
       handledOptions.callbacks,
       this.callbacks,
       handledOptions.tags,
       this.tags,
-      handledOptions.metadata,
+      inheritableMetadata,
       this.metadata,
       { verbose: this.verbose }
     );
@@ -352,13 +377,17 @@ export abstract class BaseChatModel<
       messageList.map(coerceMessageLikeToMessage)
     );
 
+    const inheritableMetadata = {
+      ...handledOptions.metadata,
+      ...this.getLsParams(parsedOptions),
+    };
     // create callback manager and start run
     const callbackManager_ = await CallbackManager.configure(
       handledOptions.callbacks,
       this.callbacks,
       handledOptions.tags,
       this.tags,
-      handledOptions.metadata,
+      inheritableMetadata,
       this.metadata,
       { verbose: this.verbose }
     );
diff --git a/langchain-core/src/runnables/tests/runnable_stream_events.test.ts b/langchain-core/src/runnables/tests/runnable_stream_events.test.ts
index 2f1f96aae969..adaf0905baac 100644
--- a/langchain-core/src/runnables/tests/runnable_stream_events.test.ts
+++ b/langchain-core/src/runnables/tests/runnable_stream_events.test.ts
@@ -546,6 +546,8 @@ test("Runnable streamEvents method with chat model chain", async () => {
       metadata: {
         foo: "bar",
         a: "b",
+        ls_model_type: "chat",
+        ls_stop: undefined,
       },
       data: {
         input: {
@@ -562,6 +564,8 @@ test("Runnable streamEvents method with chat model chain", async () => {
       metadata: {
         a: "b",
         foo: "bar",
+        ls_model_type: "chat",
+        ls_stop: undefined,
       },
       name: "my_model",
       data: { chunk: new AIMessageChunk("R") },
@@ -583,6 +587,8 @@ test("Runnable streamEvents method with chat model chain", async () => {
       metadata: {
         a: "b",
         foo: "bar",
+        ls_model_type: "chat",
+        ls_stop: undefined,
       },
       name: "my_model",
       data: { chunk: new AIMessageChunk("O") },
@@ -604,6 +610,8 @@ test("Runnable streamEvents method with chat model chain", async () => {
       metadata: {
         a: "b",
         foo: "bar",
+        ls_model_type: "chat",
+        ls_stop: undefined,
       },
       name: "my_model",
       data: { chunk: new AIMessageChunk("A") },
@@ -625,6 +633,8 @@ test("Runnable streamEvents method with chat model chain", async () => {
       metadata: {
         a: "b",
         foo: "bar",
+        ls_model_type: "chat",
+        ls_stop: undefined,
       },
       name: "my_model",
       data: { chunk: new AIMessageChunk("R") },
@@ -647,6 +657,8 @@ test("Runnable streamEvents method with chat model chain", async () => {
       metadata: {
         foo: "bar",
         a: "b",
+        ls_model_type: "chat",
+        ls_stop: undefined,
       },
       data: {
         input: {
diff --git a/libs/langchain-anthropic/src/chat_models.ts b/libs/langchain-anthropic/src/chat_models.ts
index d39e83316e5c..149292d6f361 100644
--- a/libs/langchain-anthropic/src/chat_models.ts
+++ b/libs/langchain-anthropic/src/chat_models.ts
@@ -20,6 +20,7 @@ import {
 import { getEnvironmentVariable } from "@langchain/core/utils/env";
 import {
   BaseChatModel,
+  LangSmithParams,
   type BaseChatModelParams,
 } from "@langchain/core/language_models/chat_models";
 import {
@@ -503,6 +504,18 @@ export class ChatAnthropicMessages<
     this.clientOptions = fields?.clientOptions ?? {};
   }
 
+  protected getLsParams(options: this["ParsedCallOptions"]): LangSmithParams {
+    const params = this.invocationParams(options);
+    return {
+      ls_provider: "openai",
+      ls_model_name: this.model,
+      ls_model_type: "chat",
+      ls_temperature: params.temperature ?? undefined,
+      ls_max_tokens: params.max_tokens ?? undefined,
+      ls_stop: options.stop,
+    };
+  }
+
   /**
    * Formats LangChain StructuredTools to AnthropicTools.
    *
diff --git a/libs/langchain-cohere/src/chat_models.ts b/libs/langchain-cohere/src/chat_models.ts
index 37253653db2f..1aeca0175581 100644
--- a/libs/langchain-cohere/src/chat_models.ts
+++ b/libs/langchain-cohere/src/chat_models.ts
@@ -11,6 +11,7 @@ import { CallbackManagerForLLMRun } from "@langchain/core/callbacks/manager";
 import {
   type BaseChatModelParams,
   BaseChatModel,
+  LangSmithParams,
 } from "@langchain/core/language_models/chat_models";
 import {
   ChatGeneration,
@@ -145,6 +146,21 @@ export class ChatCohere<
     this.streaming = fields?.streaming ?? this.streaming;
   }
 
+  protected getLsParams(options: this["ParsedCallOptions"]): LangSmithParams {
+    const params = this.invocationParams(options);
+    return {
+      ls_provider: "cohere",
+      ls_model_name: this.model,
+      ls_model_type: "chat",
+      ls_temperature: this.temperature ?? undefined,
+      ls_max_tokens:
+        typeof params.maxTokens === "number" ? params.maxTokens : undefined,
+      ls_stop: Array.isArray(params.stopSequences)
+        ? (params.stopSequences as unknown as string[])
+        : undefined,
+    };
+  }
+
   _llmType() {
     return "cohere";
   }
diff --git a/libs/langchain-community/src/chat_models/fireworks.ts b/libs/langchain-community/src/chat_models/fireworks.ts
index 8349da0debfb..65d6a6588c31 100644
--- a/libs/langchain-community/src/chat_models/fireworks.ts
+++ b/libs/langchain-community/src/chat_models/fireworks.ts
@@ -1,4 +1,7 @@
-import type { BaseChatModelParams } from "@langchain/core/language_models/chat_models";
+import type {
+  BaseChatModelParams,
+  LangSmithParams,
+} from "@langchain/core/language_models/chat_models";
 import {
   type OpenAIClient,
   type ChatOpenAICallOptions,
@@ -101,6 +104,12 @@ export class ChatFireworks extends ChatOpenAI<ChatFireworksCallOptions> {
     this.apiKey = fireworksApiKey;
   }
 
+  protected getLsParams(options: this["ParsedCallOptions"]): LangSmithParams {
+    const params = super.getLsParams(options);
+    params.ls_provider = "fireworks";
+    return params;
+  }
+
   toJSON() {
     const result = super.toJSON();
 
diff --git a/libs/langchain-community/src/chat_models/ollama.ts b/libs/langchain-community/src/chat_models/ollama.ts
index efd63a16536e..3fa78fa9c6b2 100644
--- a/libs/langchain-community/src/chat_models/ollama.ts
+++ b/libs/langchain-community/src/chat_models/ollama.ts
@@ -2,6 +2,7 @@ import type { BaseLanguageModelCallOptions } from "@langchain/core/language_mode
 import {
   SimpleChatModel,
   type BaseChatModelParams,
+  LangSmithParams,
 } from "@langchain/core/language_models/chat_models";
 import { CallbackManagerForLLMRun } from "@langchain/core/callbacks/manager";
 import {
@@ -176,6 +177,18 @@ export class ChatOllama
     this.format = fields.format;
   }
 
+  protected getLsParams(options: this["ParsedCallOptions"]): LangSmithParams {
+    const params = this.invocationParams(options);
+    return {
+      ls_provider: "ollama",
+      ls_model_name: this.model,
+      ls_model_type: "chat",
+      ls_temperature: this.temperature ?? undefined,
+      ls_stop: this.stop,
+      ls_max_tokens: params.options.num_predict,
+    };
+  }
+
   _llmType() {
     return "ollama";
   }
diff --git a/libs/langchain-community/src/chat_models/togetherai.ts b/libs/langchain-community/src/chat_models/togetherai.ts
index bec0f1d8b9a3..5488e6cf61fe 100644
--- a/libs/langchain-community/src/chat_models/togetherai.ts
+++ b/libs/langchain-community/src/chat_models/togetherai.ts
@@ -1,4 +1,7 @@
-import type { BaseChatModelParams } from "@langchain/core/language_models/chat_models";
+import type {
+  BaseChatModelParams,
+  LangSmithParams,
+} from "@langchain/core/language_models/chat_models";
 import {
   type OpenAIClient,
   type ChatOpenAICallOptions,
@@ -113,6 +116,12 @@ export class ChatTogetherAI extends ChatOpenAI<ChatTogetherAICallOptions> {
     });
   }
 
+  protected getLsParams(options: this["ParsedCallOptions"]): LangSmithParams {
+    const params = super.getLsParams(options);
+    params.ls_provider = "together";
+    return params;
+  }
+
   toJSON() {
     const result = super.toJSON();
 
diff --git a/libs/langchain-mistralai/src/chat_models.ts b/libs/langchain-mistralai/src/chat_models.ts
index 95fde9a21e4b..a1075518a8e4 100644
--- a/libs/langchain-mistralai/src/chat_models.ts
+++ b/libs/langchain-mistralai/src/chat_models.ts
@@ -33,6 +33,7 @@ import { CallbackManagerForLLMRun } from "@langchain/core/callbacks/manager";
 import {
   type BaseChatModelParams,
   BaseChatModel,
+  LangSmithParams,
 } from "@langchain/core/language_models/chat_models";
 
 import {
@@ -417,6 +418,17 @@ export class ChatMistralAI<
     this.model = this.modelName;
   }
 
+  protected getLsParams(options: this["ParsedCallOptions"]): LangSmithParams {
+    const params = this.invocationParams(options);
+    return {
+      ls_provider: "mistral",
+      ls_model_name: this.model,
+      ls_model_type: "chat",
+      ls_temperature: params.temperature ?? undefined,
+      ls_max_tokens: params.maxTokens ?? undefined,
+    };
+  }
+
   _llmType() {
     return "mistral_ai";
   }
diff --git a/libs/langchain-openai/src/azure/chat_models.ts b/libs/langchain-openai/src/azure/chat_models.ts
index 49db684d53b0..3cf6952cad6e 100644
--- a/libs/langchain-openai/src/azure/chat_models.ts
+++ b/libs/langchain-openai/src/azure/chat_models.ts
@@ -1,5 +1,8 @@
 import { type ClientOptions, AzureOpenAI as AzureOpenAIClient } from "openai";
-import { type BaseChatModelParams } from "@langchain/core/language_models/chat_models";
+import {
+  LangSmithParams,
+  type BaseChatModelParams,
+} from "@langchain/core/language_models/chat_models";
 import { ChatOpenAI } from "../chat_models.js";
 import { OpenAIEndpointConfig, getEndpoint } from "../utils/azure.js";
 import {
@@ -43,6 +46,12 @@ export class AzureChatOpenAI extends ChatOpenAI {
     super(newFields);
   }
 
+  protected getLsParams(options: this["ParsedCallOptions"]): LangSmithParams {
+    const params = super.getLsParams(options);
+    params.ls_provider = "azure";
+    return params;
+  }
+
   protected _getClientOptions(options: OpenAICoreRequestOptions | undefined) {
     if (!this.client) {
       const openAIEndpointConfig: OpenAIEndpointConfig = {
diff --git a/libs/langchain-openai/src/chat_models.ts b/libs/langchain-openai/src/chat_models.ts
index 8f4d607ebd9f..4d96fd1a3ff5 100644
--- a/libs/langchain-openai/src/chat_models.ts
+++ b/libs/langchain-openai/src/chat_models.ts
@@ -24,6 +24,7 @@ import { type StructuredToolInterface } from "@langchain/core/tools";
 import { getEnvironmentVariable } from "@langchain/core/utils/env";
 import {
   BaseChatModel,
+  LangSmithParams,
   type BaseChatModelParams,
 } from "@langchain/core/language_models/chat_models";
 import type {
@@ -490,6 +491,18 @@ export class ChatOpenAI<
     };
   }
 
+  protected getLsParams(options: this["ParsedCallOptions"]): LangSmithParams {
+    const params = this.invocationParams(options);
+    return {
+      ls_provider: "openai",
+      ls_model_name: this.model,
+      ls_model_type: "chat",
+      ls_temperature: params.temperature ?? undefined,
+      ls_max_tokens: params.max_tokens ?? undefined,
+      ls_stop: options.stop,
+    };
+  }
+
   override bindTools(
     tools: (Record<string, unknown> | StructuredToolInterface)[],
     kwargs?: Partial<CallOptions>