Messages (Anthropic)

POST /v1/messages

Accepts requests in the Anthropic Messages API format. Requests are translated to the internal OpenAI-compatible format, processed, and the response is translated back to the Anthropic format before returning.

This lets you use the Anthropic SDK with ai& without changing your code.

Note

This is a compatibility adapter. For the full set of request parameters, use the Chat Completions or Responses endpoints directly.

Usage

Python

from anthropic import Anthropic

client = Anthropic(
    api_key="sk-your-api-key",
    base_url="https://api.aiand.com/v1",
)

message = client.messages.create(
    model="openai/gpt-oss-120b",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Hello!"}],
)

print(message.content[0].text)

JavaScript

import Anthropic from "@anthropic-ai/sdk";

const client = new Anthropic({
  apiKey: "sk-your-api-key",
  baseURL: "https://api.aiand.com/v1",
});

const message = await client.messages.create({
  model: "openai/gpt-oss-120b",
  max_tokens: 1024,
  messages: [{ role: "user", content: "Hello!" }],
});

console.log(message.content[0].text);

How it works

1. Your request arrives in Anthropic Messages format
2. ai& translates it to OpenAI format and runs inference
3. The response is translated back to Anthropic format

Streaming is supported. Authentication uses the same Authorization: Bearer header as all other endpoints.

Supported parameters

Standard Anthropic Messages API parameters are accepted. Parameters with no equivalent in the underlying model are silently ignored.