ChatOpenRouter 集成

export OPENROUTER_API_KEY="your-api-key"

# export LANGSMITH_TRACING="true"
# export LANGSMITH_API_KEY="your-api-key"

import { ChatOpenRouter } from "@langchain/openrouter";

const model = new ChatOpenRouter({
  model: "anthropic/claude-sonnet-4.5",
  temperature: 0,
  maxTokens: 1024,
  // other params...
});

const aiMsg = await model.invoke([
  {
    role: "system",
    content:
      "You are a helpful assistant that translates English to French. Translate the user sentence.",
  },
  {
    role: "user",
    content: "I love programming.",
  },
]);
console.log(aiMsg.content);

J'adore la programmation.

const stream = await model.stream("Write a short poem about the sea.");
for await (const chunk of stream) {
  process.stdout.write(typeof chunk.content === "string" ? chunk.content : "");
}

import { ChatOpenRouter } from "@langchain/openrouter";
import { tool } from "@langchain/core/tools";
import { z } from "zod";

const getWeather = tool(async ({ location }) => `Sunny in ${location}`, {
  name: "get_weather",
  description: "Get the current weather in a given location",
  schema: z.object({
    location: z
      .string()
      .describe("The city and state, e.g. San Francisco, CA"),
  }),
});

const modelWithTools = new ChatOpenRouter({
  model: "openai/gpt-4o",
}).bindTools([getWeather]);

const aiMsg = await modelWithTools.invoke(
  "What is the weather like in San Francisco?"
);
console.log(aiMsg.tool_calls);

[
  {
    name: 'get_weather',
    args: { location: 'San Francisco, CA' },
    id: 'call_abc123',
    type: 'tool_call'
  }
]

const modelWithStrictTools = new ChatOpenRouter({
  model: "openai/gpt-4o",
}).bindTools([getWeather], { strict: true });

import { ChatOpenRouter } from "@langchain/openrouter";
import { z } from "zod";

const model = new ChatOpenRouter({ model: "openai/gpt-4.1" });

const movieSchema = z.object({
  title: z.string().describe("The title of the movie"),
  year: z.number().describe("The year the movie was released"),
  director: z.string().describe("The director of the movie"),
  rating: z.number().describe("The movie's rating out of 10"),
});

const structuredModel = model.withStructuredOutput(movieSchema, {
  name: "movie",
  method: "jsonSchema",
});
const response = await structuredModel.invoke(
  "Provide details about the movie Inception"
);
console.log(response);

{
  title: 'Inception',
  year: 2010,
  director: 'Christopher Nolan',
  rating: 8.8
}

const strictModel = model.withStructuredOutput(movieSchema, {
  name: "movie",
  method: "jsonSchema",
  strict: true,
});

const aiMsg = await model.invoke("Tell me a joke.");
console.log(aiMsg.usage_metadata);

{
  input_tokens: 12,
  output_tokens: 25,
  total_tokens: 37
}

import { AIMessageChunk } from "@langchain/core/messages";
import { concat } from "@langchain/core/utils/stream";

const stream = await model.stream("Tell me a joke.");
let finalMsg: AIMessageChunk | undefined;
for await (const chunk of stream) {
  finalMsg = finalMsg ? concat(finalMsg, chunk) : chunk;
}
console.log(finalMsg?.usage_metadata);

const model = new ChatOpenRouter({
  model: "anthropic/claude-sonnet-4.5",
  provider: {
    order: ["Anthropic", "Google"],
    allow_fallbacks: true,
  },
});

const onlyModel = new ChatOpenRouter({
  model: "openai/gpt-4o",
  provider: { only: ["OpenAI", "Azure"] },
});

const ignoreModel = new ChatOpenRouter({
  model: "meta-llama/llama-4-maverick",
  provider: { ignore: ["DeepInfra"] },
});

const fastModel = new ChatOpenRouter({
  model: "openai/gpt-4o",
  provider: { sort: "throughput" },
});

const lowLatencyModel = new ChatOpenRouter({
  model: "openai/gpt-4o",
  provider: { sort: "latency" },
});

const model = new ChatOpenRouter({
  model: "anthropic/claude-sonnet-4.5",
  provider: { data_collection: "deny" },
});

const model = new ChatOpenRouter({
  model: "meta-llama/llama-4-maverick",
  provider: { quantizations: ["fp16", "bf16"] },
});

const model = new ChatOpenRouter({
  model: "openai/gpt-4o",
  provider: {
    order: ["OpenAI", "Azure"],
    allow_fallbacks: false,
    require_parameters: true,
    data_collection: "deny",
  },
});

const model = new ChatOpenRouter({
  model: "openai/gpt-4o",
  models: ["openai/gpt-4o", "anthropic/claude-sonnet-4.5"],
  route: "fallback",
});

const model = new ChatOpenRouter({
  model: "openai/gpt-4o",
  plugins: [
    { id: "web", max_results: 5 },
  ],
});

const model = new ChatOpenRouter({
  model: "anthropic/claude-sonnet-4.5",
  siteUrl: "https://myapp.com",
  siteName: "My App",
});