diff --git a/.speakeasy/gen.lock b/.speakeasy/gen.lock
index 5f27b81..c614707 100644
--- a/.speakeasy/gen.lock
+++ b/.speakeasy/gen.lock
@@ -5,8 +5,8 @@ management:
   docVersion: 1.0.0
   speakeasyVersion: 1.660.0
   generationVersion: 2.760.2
-  releaseVersion: 0.1.24
-  configChecksum: 475b25558977e68908a4d0653d872817
+  releaseVersion: 0.1.25
+  configChecksum: ec2472ec2f065c6df73009a241b9f6cb
   repoURL: https://github.com/OpenRouterTeam/typescript-sdk.git
   installationURL: https://github.com/OpenRouterTeam/typescript-sdk
   published: true
diff --git a/.speakeasy/gen.yaml b/.speakeasy/gen.yaml
index 1c0234d..d6a821e 100644
--- a/.speakeasy/gen.yaml
+++ b/.speakeasy/gen.yaml
@@ -30,7 +30,7 @@ generation:
     generateNewTests: true
     skipResponseBodyAssertions: false
 typescript:
-  version: 0.1.24
+  version: 0.1.25
   acceptHeaderEnum: false
   additionalDependencies:
     dependencies: {}
diff --git a/.speakeasy/workflow.lock b/.speakeasy/workflow.lock
index 12f59e2..fd86e10 100644
--- a/.speakeasy/workflow.lock
+++ b/.speakeasy/workflow.lock
@@ -14,7 +14,7 @@ targets:
         sourceRevisionDigest: sha256:ffe0e925561a55a1b403667fe33bb3158e05892ef1e66f56211544c9a890b301
         sourceBlobDigest: sha256:18aa7b22686c2f559af1062fea408a9f80146231027ed1fd62b68df38c71f65d
         codeSamplesNamespace: open-router-chat-completions-api-typescript-code-samples
-        codeSamplesRevisionDigest: sha256:f856e6a616f0d8edab5b1a77e49bfd32584caeb323d4ee7b740c6a7791c222fb
+        codeSamplesRevisionDigest: sha256:e88cd9ad795f165e1caced900c25a1fc13e944c9936ed229e43a1140d6c0b52c
 workflow:
     workflowVersion: 1.0.0
     speakeasyVersion: latest
diff --git a/jsr.json b/jsr.json
index 8178e4c..b0f9a56 100644
--- a/jsr.json
+++ b/jsr.json
@@ -2,7 +2,7 @@
 
 {
   "name": "@openrouter/sdk",
-  "version": "0.1.24",
+  "version": "0.1.25",
   "exports": {
     ".": "./src/index.ts",    
     "./models/errors": "./src/models/errors/index.ts",    
diff --git a/package-lock.json b/package-lock.json
index 9361585..79640f3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@openrouter/sdk",
-  "version": "0.1.24",
+  "version": "0.1.25",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@openrouter/sdk",
-      "version": "0.1.24",
+      "version": "0.1.25",
       "license": "Apache-2.0",
       "dependencies": {
         "zod": "^3.25.0 || ^4.0.0"
diff --git a/package.json b/package.json
index 45b2b9d..6ef2d95 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@openrouter/sdk",
-  "version": "0.1.24",
+  "version": "0.1.25",
   "author": "OpenRouter",
   "description": "The OpenRouter TypeScript SDK is a type-safe toolkit for building AI applications with access to 300+ language models through a unified API.",
   "keywords": [
diff --git a/src/funcs/callModel.ts b/src/funcs/callModel.ts
index b0dafcf..625724f 100644
--- a/src/funcs/callModel.ts
+++ b/src/funcs/callModel.ts
@@ -5,6 +5,110 @@ import * as models from "../models/index.js";
 import { EnhancedTool, MaxToolRounds } from "../lib/tool-types.js";
 import { convertEnhancedToolsToAPIFormat } from "../lib/tool-executor.js";
 
+/**
+ * Input type that accepts both chat-style messages and responses-style input
+ */
+export type CallModelInput =
+  | models.OpenResponsesInput
+  | models.Message[];
+
+/**
+ * Tool type that accepts chat-style, responses-style, or enhanced tools
+ */
+export type CallModelTools =
+  | EnhancedTool[]
+  | models.ToolDefinitionJson[]
+  | models.OpenResponsesRequest["tools"];
+
+/**
+ * Check if input is chat-style messages (Message[])
+ */
+function isChatStyleMessages(input: CallModelInput): input is models.Message[] {
+  if (!Array.isArray(input)) return false;
+  if (input.length === 0) return false;
+
+  const first = input[0] as any;
+  // Chat-style messages have role but no 'type' field at top level
+  // Responses-style items have 'type' field (like 'message', 'function_call', etc.)
+  return first && 'role' in first && !('type' in first);
+}
+
+/**
+ * Check if tools are chat-style (ToolDefinitionJson[])
+ */
+function isChatStyleTools(tools: CallModelTools): tools is models.ToolDefinitionJson[] {
+  if (!Array.isArray(tools)) return false;
+  if (tools.length === 0) return false;
+
+  const first = tools[0] as any;
+  // Chat-style tools have nested 'function' property with 'name' inside
+  // Enhanced tools have 'function' with 'inputSchema'
+  // Responses-style tools have 'name' at top level
+  return first && 'function' in first && first.function && 'name' in first.function && !('inputSchema' in first.function);
+}
+
+/**
+ * Convert chat-style tools to responses-style
+ */
+function convertChatToResponsesTools(tools: models.ToolDefinitionJson[]): models.OpenResponsesRequest["tools"] {
+  return tools.map((tool): models.OpenResponsesRequestToolFunction => ({
+    type: "function",
+    name: tool.function.name,
+    description: tool.function.description ?? null,
+    strict: tool.function.strict ?? null,
+    parameters: tool.function.parameters ?? null,
+  }));
+}
+
+/**
+ * Convert chat-style messages to responses-style input
+ */
+function convertChatToResponsesInput(messages: models.Message[]): models.OpenResponsesInput {
+  return messages.map((msg): models.OpenResponsesEasyInputMessage | models.OpenResponsesFunctionCallOutput => {
+    // Extract extra fields like cache_control
+    const { role, content, ...extraFields } = msg as any;
+
+    if (role === "tool") {
+      const toolMsg = msg as models.ToolResponseMessage;
+      return {
+        type: "function_call_output",
+        callId: toolMsg.toolCallId,
+        output: typeof toolMsg.content === "string" ? toolMsg.content : JSON.stringify(toolMsg.content),
+        ...extraFields,
+      } as models.OpenResponsesFunctionCallOutput;
+    }
+
+    // Handle assistant messages with tool calls
+    if (role === "assistant") {
+      const assistantMsg = msg as models.AssistantMessage;
+      // If it has tool calls, we need to convert them
+      // For now, just convert the content part
+      return {
+        role: "assistant",
+        content: typeof assistantMsg.content === "string"
+          ? assistantMsg.content
+          : assistantMsg.content === null
+            ? ""
+            : JSON.stringify(assistantMsg.content),
+        ...extraFields,
+      } as models.OpenResponsesEasyInputMessage;
+    }
+
+    // System, user, developer messages
+    const convertedContent = typeof content === "string"
+      ? content
+      : content === null || content === undefined
+        ? ""
+        : JSON.stringify(content);
+
+    return {
+      role: role as "user" | "system" | "developer",
+      content: convertedContent,
+      ...extraFields,
+    } as models.OpenResponsesEasyInputMessage;
+  }) as models.OpenResponsesInput;
+}
+
 /**
  * Get a response with multiple consumption patterns
  *
@@ -75,24 +179,46 @@ import { convertEnhancedToolsToAPIFormat } from "../lib/tool-executor.js";
  */
 export function callModel(
   client: OpenRouterCore,
-  request: Omit<models.OpenResponsesRequest, "stream" | "tools"> & {
-    tools?: EnhancedTool[] | models.OpenResponsesRequest["tools"];
+  request: Omit<models.OpenResponsesRequest, "stream" | "tools" | "input"> & {
+    input?: CallModelInput;
+    tools?: CallModelTools;
     maxToolRounds?: MaxToolRounds;
   },
   options?: RequestOptions,
 ): ResponseWrapper {
-  const { tools, maxToolRounds, ...apiRequest } = request;
+  const { tools, maxToolRounds, input, ...restRequest } = request;
+
+  // Convert chat-style messages to responses-style input if needed
+  const convertedInput = input && isChatStyleMessages(input)
+    ? convertChatToResponsesInput(input)
+    : input;
+
+  const apiRequest = {
+    ...restRequest,
+    input: convertedInput,
+  };
 
-  // Separate enhanced tools from API tools
+  // Determine tool type and convert as needed
   let isEnhancedTools = false;
-  if (tools && tools.length > 0) {
+  let isChatTools = false;
+
+  if (tools && Array.isArray(tools) && tools.length > 0) {
     const firstTool = tools[0] as any;
     isEnhancedTools = "function" in firstTool && firstTool.function && "inputSchema" in firstTool.function;
+    isChatTools = !isEnhancedTools && isChatStyleTools(tools);
   }
+
   const enhancedTools = isEnhancedTools ? (tools as EnhancedTool[]) : undefined;
 
-  // Convert enhanced tools to API format if provided, otherwise use tools as-is
-  const apiTools = enhancedTools ? convertEnhancedToolsToAPIFormat(enhancedTools) : (tools as models.OpenResponsesRequest["tools"]);
+  // Convert tools to API format based on their type
+  let apiTools: models.OpenResponsesRequest["tools"];
+  if (enhancedTools) {
+    apiTools = convertEnhancedToolsToAPIFormat(enhancedTools);
+  } else if (isChatTools) {
+    apiTools = convertChatToResponsesTools(tools as models.ToolDefinitionJson[]);
+  } else {
+    apiTools = tools as models.OpenResponsesRequest["tools"];
+  }
 
   // Build the request with converted tools
   const finalRequest: models.OpenResponsesRequest = {
diff --git a/src/lib/config.ts b/src/lib/config.ts
index ad573f5..572f8e8 100644
--- a/src/lib/config.ts
+++ b/src/lib/config.ts
@@ -69,7 +69,7 @@ export function serverURLFromOptions(options: SDKOptions): URL | null {
 export const SDK_METADATA = {
   language: "typescript",
   openapiDocVersion: "1.0.0",
-  sdkVersion: "0.1.24",
+  sdkVersion: "0.1.25",
   genVersion: "2.760.2",
-  userAgent: "speakeasy-sdk/typescript 0.1.24 2.760.2 1.0.0 @openrouter/sdk",
+  userAgent: "speakeasy-sdk/typescript 0.1.25 2.760.2 1.0.0 @openrouter/sdk",
 } as const;
diff --git a/src/sdk/sdk.ts b/src/sdk/sdk.ts
index 68ef8da..0e0566f 100644
--- a/src/sdk/sdk.ts
+++ b/src/sdk/sdk.ts
@@ -94,8 +94,9 @@ export class OpenRouter extends ClientSDK {
 
   // #region sdk-class-body
   callModel(
-    request: Omit<models.OpenResponsesRequest, "stream" | "tools"> & {
-      tools?: EnhancedTool[] | models.OpenResponsesRequest["tools"];
+    request: Omit<models.OpenResponsesRequest, "stream" | "tools" | "input"> & {
+      input?: import("../funcs/callModel.js").CallModelInput;
+      tools?: import("../funcs/callModel.js").CallModelTools;
       maxToolRounds?: MaxToolRounds;
     },
     options?: RequestOptions,
diff --git a/tests/e2e/callModel.test.ts b/tests/e2e/callModel.test.ts
index d0af194..17a210e 100644
--- a/tests/e2e/callModel.test.ts
+++ b/tests/e2e/callModel.test.ts
@@ -21,6 +21,151 @@ describe("callModel E2E Tests", () => {
     });
   });
 
+  describe("Chat-style messages support", () => {
+    it("should accept chat-style Message array as input", async () => {
+      const response = client.callModel({
+        model: "meta-llama/llama-3.2-1b-instruct",
+        input: [
+          {
+            role: "system",
+            content: "You are a helpful assistant.",
+          },
+          {
+            role: "user",
+            content: "Say 'chat test' and nothing else.",
+          },
+        ],
+      });
+
+      const text = await response.getText();
+
+      expect(text).toBeDefined();
+      expect(typeof text).toBe("string");
+      expect(text.length).toBeGreaterThan(0);
+    });
+
+    it("should handle multi-turn chat-style conversation", async () => {
+      const response = client.callModel({
+        model: "meta-llama/llama-3.2-1b-instruct",
+        input: [
+          {
+            role: "user",
+            content: "My favorite color is blue.",
+          },
+          {
+            role: "assistant",
+            content: "That's nice! Blue is a calming color.",
+          },
+          {
+            role: "user",
+            content: "What is my favorite color?",
+          },
+        ],
+      });
+
+      const text = await response.getText();
+
+      expect(text).toBeDefined();
+      expect(text.toLowerCase()).toContain("blue");
+    });
+
+    it("should handle system message in chat-style input", async () => {
+      const response = client.callModel({
+        model: "meta-llama/llama-3.2-1b-instruct",
+        input: [
+          {
+            role: "system",
+            content: "Always respond with exactly one word.",
+          },
+          {
+            role: "user",
+            content: "Say hello.",
+          },
+        ],
+      });
+
+      const text = await response.getText();
+
+      expect(text).toBeDefined();
+      expect(typeof text).toBe("string");
+    });
+
+    it("should accept chat-style tools (ToolDefinitionJson)", async () => {
+      const response = client.callModel({
+        model: "qwen/qwen3-vl-8b-instruct",
+        input: [
+          {
+            role: "user",
+            content: "What's the weather in Paris? Use the get_weather tool.",
+          },
+        ],
+        tools: [
+          {
+            type: "function" as const,
+            function: {
+              name: "get_weather",
+              description: "Get weather for a location",
+              parameters: {
+                type: "object",
+                properties: {
+                  location: {
+                    type: "string",
+                    description: "City name",
+                  },
+                },
+                required: ["location"],
+              },
+            },
+          },
+        ],
+      });
+
+      const toolCalls = await response.getToolCalls();
+
+      // Model should call the tool
+      expect(toolCalls.length).toBeGreaterThan(0);
+      expect(toolCalls[0].name).toBe("get_weather");
+      expect(toolCalls[0].arguments).toBeDefined();
+    }, 30000);
+
+    it("should work with chat-style messages and chat-style tools together", async () => {
+      const response = client.callModel({
+        model: "meta-llama/llama-3.1-8b-instruct",
+        input: [
+          {
+            role: "system",
+            content: "You are a helpful assistant. Use tools when needed.",
+          },
+          {
+            role: "user",
+            content: "Get the weather in Tokyo using the weather tool.",
+          },
+        ],
+        tools: [
+          {
+            type: "function" as const,
+            function: {
+              name: "get_weather",
+              description: "Get current weather",
+              parameters: {
+                type: "object",
+                properties: {
+                  city: { type: "string" },
+                },
+                required: ["city"],
+              },
+            },
+          },
+        ],
+      });
+
+      const toolCalls = await response.getToolCalls();
+
+      expect(toolCalls.length).toBeGreaterThan(0);
+      expect(toolCalls[0].name).toBe("get_weather");
+    }, 30000);
+  });
+
   describe("response.text - Text extraction", () => {
     it("should successfully get text from a response", async () => {
       const response = client.callModel({