TypeScript (Unified Mode)

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import OpenAI from "openai";
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const client = new OpenAI({
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  apiKey: "sk-proxy-YOUR_KEY_HERE",
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  baseURL: "https://gateway.example.com/v1",
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});

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const response = await client.chat.completions.create({
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  model: "anthropic/claude-sonnet-4-6",
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  messages: [{ role: "user", content: "Hello!" }],
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});
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console.log(response.choices[0].message.content);

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const stream = await client.chat.completions.create({
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  model: "openai/gpt-4o",
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  messages: [{ role: "user", content: "Write a haiku about TypeScript." }],
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  stream: true,
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});
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for await (const chunk of stream) {
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  const content = chunk.choices[0]?.delta?.content;
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  if (content) process.stdout.write(content);
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}

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const response = await client.chat.completions.create({
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  model: "google/gemini-2.5-flash",
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  messages: [{ role: "user", content: "What's the weather in London?" }],
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  tools: [
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    {
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      type: "function",
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      function: {
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        name: "get_weather",
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        description: "Get weather for a city",
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        parameters: {
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          type: "object",
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          properties: {
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            city: { type: "string" },
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          },
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          required: ["city"],
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        },
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      },
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    },
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  ],
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  tool_choice: "auto",
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});
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const toolCall = response.choices[0].message.tool_calls?.[0];
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if (toolCall) {
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  console.log(`${toolCall.function.name}(${toolCall.function.arguments})`);
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}

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const response = await client.chat.completions.create({
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  model: "anthropic/claude-sonnet-4-6",
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  messages: [
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    { role: "system", content: "You are a code reviewer. Be concise." },
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    { role: "user", content: "Review: const x = arr.filter(i => i > 0).length > 0" },
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  ],
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});

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const models = [
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  "openai/gpt-4o",
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  "anthropic/claude-sonnet-4-6",
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  "google/gemini-2.5-flash",
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];
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for (const model of models) {
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  const response = await client.chat.completions.create({
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    model,
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    messages: [{ role: "user", content: "What is 2+2?" }],
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  });
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  console.log(`${model}: ${response.choices[0].message.content}`);
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}