npm install @openrouter/sdk

import OpenRouter from '@openrouter/sdk';
const client = new OpenRouter({
  apiKey: process.env.OPENROUTER_API_KEY
});

export OPENROUTER_API_KEY=sk-or-v1-your-key-here

import OpenRouter from '@openrouter/sdk';
const client = new OpenRouter({
  apiKey: process.env.OPENROUTER_API_KEY
});

// API key is automatically included
const result = client.callModel({
  model: 'openai/gpt-5-nano',
  input: 'Hello!'
});

const keyInfo = await client.apiKeys.getCurrentKeyMetadata();
console.log('Key name:', keyInfo.name);
console.log('Created:', keyInfo.createdAt);

// List all keys
const keys = await client.apiKeys.list();
// Create a new key
const newKey = await client.apiKeys.create({
  name: 'Production API Key'
});
// Get a specific key by hash
const key = await client.apiKeys.get({
  hash: 'sk-or-v1-...'
});
// Update a key
await client.apiKeys.update({
  hash: 'sk-or-v1-...',
  requestBody: {
    name: 'Updated Key Name'
  }
});
// Delete a key
await client.apiKeys.delete({
  hash: 'sk-or-v1-...'
});

const authResponse = await client.oAuth.createAuthCode({
  callbackUrl: 'https://myapp.com/auth/callback'
});
// authResponse contains:
// - authorizationUrl: URL to redirect the user to
// - code: The authorization code for later exchange
console.log('Redirect user to:', authResponse.authorizationUrl);

// In a browser environment
window.location.href = authResponse.authorizationUrl;
// Or in a server-rendered app, return a redirect response
res.redirect(authResponse.authorizationUrl);

// In your callback handler
const code = req.query.code;  // From the redirect URL
const apiKeyResponse = await client.oAuth.exchangeAuthCodeForAPIKey({
  code: code
});
// apiKeyResponse contains:
// - key: The user's API key
// - Additional metadata about the key
const userApiKey = apiKeyResponse.key;
// Store securely for this user's future requests
await saveUserApiKey(userId, userApiKey);

import OpenRouter from '@openrouter/sdk';
import express from 'express';
const app = express();
const client = new OpenRouter({
  apiKey: process.env.OPENROUTER_API_KEY  // Your app's key for OAuth operations
});
// Step 1: Initiate OAuth flow
app.get('/auth/start', async (req, res) => {
  const authResponse = await client.oAuth.createAuthCode({
    callbackUrl: 'https://myapp.com/auth/callback'
  });
  // Store any state needed for the callback
  req.session.oauthState = { /* ... */ };
  // Redirect user to OpenRouter authorization page
  res.redirect(authResponse.authorizationUrl);
});
// Step 2: Handle callback and exchange code
app.get('/auth/callback', async (req, res) => {
  const { code } = req.query;
  if (!code) {
    return res.status(400).send('Authorization code missing');
  }
  try {
    const apiKeyResponse = await client.oAuth.exchangeAuthCodeForAPIKey({
      code: code as string
    });
    // Store the user's API key securely
    await saveUserApiKey(req.session.userId, apiKeyResponse.key);
    res.redirect('/dashboard?auth=success');
  } catch (error) {
    console.error('OAuth exchange failed:', error);
    res.redirect('/auth/error');
  }
});
// Step 3: Use the user's API key for their requests
app.post('/api/chat', async (req, res) => {
  const userApiKey = await getUserApiKey(req.session.userId);
  // Create a client with the user's key
  const userClient = new OpenRouter({
    apiKey: userApiKey
  });
  const result = userClient.callModel({
    model: 'openai/gpt-5-nano',
    input: req.body.message
  });
  const text = await result.getText();
  res.json({ response: text });
});

const result = client.callModel({
  model: 'openai/gpt-5-nano',
  input: 'Explain quantum computing in one sentence.',
});
const text = await result.getText();

const result = client.callModel({
  model: 'openai/gpt-5-nano',
  input: 'Hello, how are you?'
});

const result = client.callModel({
  model: 'openai/gpt-5-nano',
  input: [
    { role: 'user', content: 'What is the capital of France?' },
    { role: 'assistant', content: 'The capital of France is Paris.' },
    { role: 'user', content: 'What is its population?' }
  ]
});

const result = client.callModel({
  model: 'openai/gpt-5-nano',
  input: [
    {
      role: 'user',
      content: [
        { type: 'text', text: 'What is in this image?' },
        { type: 'image_url', image_url: { url: 'https://example.com/image.png' } }
      ]
    }
  ]
});

const result = client.callModel({
  model: 'openai/gpt-5-nano',
  instructions: 'You are a helpful coding assistant. Be concise.',
  input: 'How do I reverse a string in Python?'
});

const result = client.callModel({
  model: 'openai/gpt-5-nano',
  input: 'Write a haiku about coding'
});
const text = await result.getText();
console.log(text);

const result = client.callModel({
  model: 'openai/gpt-5-nano',
  input: 'Hello!'
});
const response = await result.getResponse();
console.log('Text:', response.text);
console.log('Token usage:', response.usage);

const result = client.callModel({
  model: 'openai/gpt-5-nano',
  input: 'Write a short story'
});
for await (const delta of result.getTextStream()) {
  process.stdout.write(delta);
}

import { tool } from '@openrouter/sdk';
import { z } from 'zod';
const weatherTool = tool({
  name: 'get_weather',
  description: 'Get current weather for a location',
  inputSchema: z.object({
    location: z.string().describe('City name'),
    units: z.enum(['celsius', 'fahrenheit']).optional().default('celsius')
  }),
  outputSchema: z.object({
    temperature: z.number(),
    conditions: z.string(),
    humidity: z.number()
  }),
  execute: async (params) => {
    // Implement weather fetching logic
    return {
      temperature: 22,
      conditions: 'Sunny',
      humidity: 45
    };
  }
});

const result = client.callModel({
  model: 'openai/gpt-5-nano',
  input: 'What is the weather in Paris?',
  tools: [weatherTool]
});
const text = await result.getText();
// The SDK automatically executes the tool and continues the conversation

const calculatorTool = tool({
  name: 'calculate',
  description: 'Perform mathematical calculations',
  inputSchema: z.object({
    expression: z.string()
  }),
  execute: async ({ expression }) => {
    return { result: eval(expression) };
  }
});

const searchTool = tool({
  name: 'web_search',
  description: 'Search the web',
  inputSchema: z.object({ query: z.string() }),
  eventSchema: z.object({
    type: z.literal('progress'),
    message: z.string()
  }),
  outputSchema: z.object({ results: z.array(z.string()) }),
  execute: async function* ({ query }) {
    yield { type: 'progress', message: 'Searching...' };
    yield { type: 'progress', message: 'Processing results...' };
    return { results: ['Result 1', 'Result 2'] };
  }
});

const manualTool = tool({
  name: 'user_confirmation',
  description: 'Request user confirmation',
  inputSchema: z.object({ message: z.string() }),
  execute: false
});

import { stepCountIs, maxCost, hasToolCall } from '@openrouter/sdk';
const result = client.callModel({
  model: 'openai/gpt-5.2',
  input: 'Research this topic thoroughly',
  tools: [searchTool, analyzeTool],
  stopWhen: [
    stepCountIs(10),      // Stop after 10 turns
    maxCost(1.00),        // Stop if cost exceeds $1.00
    hasToolCall('finish') // Stop when 'finish' tool is called
  ]
});

const customStop = (context) => {
  return context.messages.length > 20;
};
const result = client.callModel({
  model: 'openai/gpt-5-nano',
  input: 'Complex task',
  tools: [myTool],
  stopWhen: customStop
});

const result = client.callModel({
  model: (ctx) => ctx.numberOfTurns > 3 ? 'openai/gpt-4' : 'openai/gpt-4o-mini',
  temperature: (ctx) => ctx.numberOfTurns > 1 ? 0.3 : 0.7,
  input: 'Hello!'
});

const skillTool = tool({
  name: 'load_skill',
  description: 'Load a specialized skill',
  inputSchema: z.object({
    skill: z.string().describe('Name of the skill to load')
  }),
  nextTurnParams: {
    instructions: (params, context) => {
      const skillInstructions = loadSkillInstructions(params.skill);
      return `${context.instructions}\n\n${skillInstructions}`;
    }
  },
  execute: async ({ skill }) => {
    return { loaded: skill };
  }
});

const result = client.callModel({
  model: 'openai/gpt-5-nano',
  input: 'Write a creative story',
  temperature: 0.7,        // Creativity (0-2, default varies by model)
  maxOutputTokens: 1000,   // Maximum tokens to generate
  topP: 0.9,               // Nucleus sampling parameter
  frequencyPenalty: 0.5,   // Reduce repetition
  presencePenalty: 0.5,    // Encourage new topics
  stop: ['\n\n']           // Stop sequences
});

const result = client.callModel({
  model: 'openai/gpt-5-nano',
  input: 'Write a detailed explanation'
});
// Consumer 1: Stream text to console
const textPromise = (async () => {
  for await (const delta of result.getTextStream()) {
    process.stdout.write(delta);
  }
})();
// Consumer 2: Get full response simultaneously
const responsePromise = result.getResponse();
// Both run concurrently
const [, response] = await Promise.all([textPromise, responsePromise]);
console.log('\n\nTotal tokens:', response.usage.totalTokens);

const result = client.callModel({
  model: 'openai/gpt-5-nano',
  input: 'Search for information about TypeScript',
  tools: [searchTool]
});
for await (const toolCall of result.getToolCallsStream()) {
  console.log(`Tool called: ${toolCall.name}`);
  console.log(`Arguments: ${JSON.stringify(toolCall.arguments)}`);
  console.log(`Result: ${JSON.stringify(toolCall.result)}`);
}

import { fromChatMessages, toChatMessage } from '@openrouter/sdk';
// OpenAI messages → OpenRouter format
const result = client.callModel({
  model: 'openai/gpt-5-nano',
  input: fromChatMessages(openaiMessages)
});
// Response → OpenAI chat message format
const response = await result.getResponse();
const chatMsg = toChatMessage(response);

import { fromClaudeMessages, toClaudeMessage } from '@openrouter/sdk';
// Claude messages → OpenRouter format
const result = client.callModel({
  model: 'anthropic/claude-3-opus',
  input: fromClaudeMessages(claudeMessages)
});
// Response → Claude message format
const response = await result.getResponse();
const claudeMsg = toClaudeMessage(response);

interface TextMessage {
  role: 'user' | 'assistant';
  content: string;
}

interface MultimodalMessage {
  role: 'user';
  content: Array<
    | { type: 'input_text'; text: string }
    | { type: 'input_image'; imageUrl: string; detail?: 'auto' | 'low' | 'high' }
    | {
        type: 'image';
        source: {
          type: 'url' | 'base64';
          url?: string;
          media_type?: string;
          data?: string
        }
      }
  >;
}

interface ToolCallMessage {
  role: 'assistant';
  content?: null;
  tool_calls?: Array<{
    id: string;
    type: 'function';
    function: {
      name: string;
      arguments: string;  // JSON-encoded arguments
    };
  }>;
}

interface ToolResultMessage {
  role: 'tool';
  tool_call_id: string;
  content: string;  // JSON-encoded result
}

interface OpenResponsesNonStreamingResponse {
  output: Array<ResponseMessage>;
  usage?: {
    inputTokens: number;
    outputTokens: number;
    cachedTokens?: number;
  };
  finishReason?: string;
  warnings?: Array<{
    type: string;
    message: string
  }>;
  experimental_providerMetadata?: Record<string, unknown>;
}

// Text/content message
interface ResponseOutputMessage {
  type: 'message';
  role: 'assistant';
  content: string | Array<ContentPart>;
  reasoning?: string;  // For reasoning models (o1, etc.)
}
// Tool result in output
interface FunctionCallOutputMessage {
  type: 'function_call_output';
  call_id: string;
  output: string;
}

interface ParsedToolCall {
  id: string;
  name: string;
  arguments: unknown;  // Validated against inputSchema
}

interface ToolExecutionResult {
  toolCallId: string;
  toolName: string;
  result: unknown;                  // Validated against outputSchema
  preliminaryResults?: unknown[];   // From generator tools
  error?: Error;
}

interface StepResult {
  stepType: 'initial' | 'continue';
  text: string;
  toolCalls: ParsedToolCall[];
  toolResults: ToolExecutionResult[];
  response: OpenResponsesNonStreamingResponse;
  usage?: {
    inputTokens: number;
    outputTokens: number;
    cachedTokens?: number;
  };
  finishReason?: string;
  warnings?: Array<{ type: string; message: string }>;
  experimental_providerMetadata?: Record<string, unknown>;
}

interface TurnContext {
  numberOfTurns: number;                     // Turn count (1-indexed)
  turnRequest?: OpenResponsesRequest;        // Current request being made
  toolCall?: OpenResponsesFunctionToolCall;  // Current tool call (in tool context)
}

type EnhancedResponseStreamEvent =
  | ResponseCreatedEvent
  | ResponseInProgressEvent
  | OutputTextDeltaEvent
  | OutputTextDoneEvent
  | ReasoningDeltaEvent
  | ReasoningDoneEvent
  | FunctionCallArgumentsDeltaEvent
  | FunctionCallArgumentsDoneEvent
  | ResponseCompletedEvent
  | ToolPreliminaryResultEvent;

interface OutputTextDeltaEvent {
  type: 'response.output_text.delta';
  delta: string;
}

interface ReasoningDeltaEvent {
  type: 'response.reasoning.delta';
  delta: string;
}

interface FunctionCallArgumentsDeltaEvent {
  type: 'response.function_call_arguments.delta';
  delta: string;
}

interface ToolPreliminaryResultEvent {
  type: 'tool.preliminary_result';
  toolCallId: string;
  result: unknown;  // Matches the tool's eventSchema
}

interface ResponseCompletedEvent {
  type: 'response.completed';
  response: OpenResponsesNonStreamingResponse;
}

type ToolStreamEvent =
  | { type: 'delta'; content: string }
  | { type: 'preliminary_result'; toolCallId: string; result: unknown };

const result = client.callModel({
  model: 'openai/gpt-5-nano',
  input: 'Analyze this data',
  tools: [analysisTool]
});
for await (const event of result.getFullResponsesStream()) {
  switch (event.type) {
    case 'response.output_text.delta':
      process.stdout.write(event.delta);
      break;
    case 'response.reasoning.delta':
      console.log('[Reasoning]', event.delta);
      break;
    case 'response.function_call_arguments.delta':
      console.log('[Tool Args]', event.delta);
      break;
    case 'tool.preliminary_result':
      console.log(`[Progress: ${event.toolCallId}]`, event.result);
      break;
    case 'response.completed':
      console.log('\n[Complete]', event.response.usage);
      break;
  }
}

type MessageStreamUpdate =
  | ResponsesOutputMessage        // Text/content updates
  | OpenResponsesFunctionCallOutput;  // Tool results

const result = client.callModel({
  model: 'openai/gpt-5-nano',
  input: 'Research this topic',
  tools: [searchTool]
});
const allMessages: MessageStreamUpdate[] = [];
for await (const message of result.getNewMessagesStream()) {
  allMessages.push(message);
  if (message.type === 'message') {
    console.log('Assistant:', message.content);
  } else if (message.type === 'function_call_output') {
    console.log('Tool result:', message.output);
  }
}

const client = new OpenRouter({
  apiKey: process.env.OPENROUTER_API_KEY
});
// List available models
const models = await client.models.list();
// Chat completions (alternative to callModel)
const completion = await client.chat.send({
  model: 'openai/gpt-5-nano',
  messages: [{ role: 'user', content: 'Hello!' }]
});
// Legacy completions format
const legacyCompletion = await client.completions.generate({
  model: 'openai/gpt-5-nano',
  prompt: 'Once upon a time'
});
// Usage analytics
const activity = await client.analytics.getUserActivity();
// Credit balance
const credits = await client.credits.getCredits();
// API key management
const keys = await client.apiKeys.list();

try {
  const result = await client.callModel({
    model: 'openai/gpt-5-nano',
    input: 'Hello!'
  });
  const text = await result.getText();
} catch (error) {
  if (error.statusCode === 401) {
    console.error('Invalid API key - check your OPENROUTER_API_KEY');
  } else if (error.statusCode === 402) {
    console.error('Insufficient credits - add credits at openrouter.ai');
  } else if (error.statusCode === 429) {
    console.error('Rate limited - implement backoff retry');
  } else if (error.statusCode === 503) {
    console.error('Model temporarily unavailable - try again or use fallback');
  } else {
    console.error('Unexpected error:', error.message);
  }
}

import OpenRouter, { tool, stepCountIs } from '@openrouter/sdk';
import { z } from 'zod';
const client = new OpenRouter({
  apiKey: process.env.OPENROUTER_API_KEY
});
// Define tools
const searchTool = tool({
  name: 'web_search',
  description: 'Search the web for information',
  inputSchema: z.object({
    query: z.string().describe('Search query')
  }),
  outputSchema: z.object({
    results: z.array(z.object({
      title: z.string(),
      snippet: z.string(),
      url: z.string()
    }))
  }),
  execute: async ({ query }) => {
    // Implement actual search
    return {
      results: [
        { title: 'Example', snippet: 'Example result', url: 'https://example.com' }
      ]
    };
  }
});
const finishTool = tool({
  name: 'finish',
  description: 'Complete the task with final answer',
  inputSchema: z.object({
    answer: z.string().describe('The final answer')
  }),
  execute: async ({ answer }) => ({ answer })
});
// Run agent
async function runAgent(task: string) {
  const result = client.callModel({
    model: 'openai/gpt-5-nano',
    instructions: 'You are a helpful research assistant. Use web_search to find information, then use finish to provide your final answer.',
    input: task,
    tools: [searchTool, finishTool],
    stopWhen: [
      stepCountIs(10),
      hasToolCall('finish')
    ]
  });
  // Stream progress
  for await (const toolCall of result.getToolCallsStream()) {
    console.log(`[${toolCall.name}] ${JSON.stringify(toolCall.arguments)}`);
  }
  return await result.getText();
}
// Usage
const answer = await runAgent('What are the latest developments in quantum computing?');
console.log('Final answer:', answer);

import { z } from 'zod';
const schema = z.object({
  name: z.string().min(1),
  age: z.number().int().positive()
});

stopWhen: [stepCountIs(20), maxCost(5.00)]

async function callWithRetry(params, maxRetries = 3) {
  for (let i = 0; i < maxRetries; i++) {
    try {
      return await client.callModel(params).getText();
    } catch (error) {
      if (error.statusCode === 429 || error.statusCode >= 500) {
        await sleep(Math.pow(2, i) * 1000);
        continue;
      }
      throw error;
    }
  }
}

for await (const delta of result.getTextStream()) {
  // Process incrementally
}