Messages

For authentication and model list, see Overview.

Endpoint

POST https://api.pipellm.ai/v1/messages

This free route accepts Anthropic Messages requests and routes only to Anthropic-compatible platforms. To keep the Anthropic format while calling OpenAI or Gemini models, use the Anthropic Format Converter.

Install SDKs

Python
Node.js
Go

pip install anthropic

npm install @anthropic-ai/sdk

go get github.com/anthropics/anthropic-sdk-go

Code Examples

cURL
Python
Node.js
Go

curl https://api.pipellm.ai/v1/messages \
  -H "Content-Type: application/json" \
  -H "x-api-key: $PIPELLM_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -d @- << 'EOF'
{
  "model": "claude-sonnet-4-5-20250929",
  "max_tokens": 1024,
  "messages": [
    {"role": "user", "content": "Why is the sky blue?"}
  ]
}
EOF

import os
import anthropic

client = anthropic.Anthropic(
  api_key=os.getenv('PIPELLM_API_KEY'),
  base_url='https://api.pipellm.ai'
)

message = client.messages.create(
  model='claude-sonnet-4-5-20250929',
  max_tokens=1024,
  messages=[
    {'role': 'user', 'content': 'Why is the sky blue?'}
  ]
)

print(message.content[0].text)

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

const client = new Anthropic({
  apiKey: process.env.PIPELLM_API_KEY,
  baseURL: 'https://api.pipellm.ai'
});

const message = await client.messages.create({
  model: 'claude-sonnet-4-5-20250929',
  max_tokens: 1024,
  messages: [
    { role: 'user', content: 'Why is the sky blue?' }
  ]
});

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

package main

import (
  "context"
  "os"
  "github.com/anthropics/anthropic-sdk-go"
  "github.com/anthropics/anthropic-sdk-go/option"
)

func main() {
  client := anthropic.NewClient(
    option.WithAPIKey(os.Getenv("PIPELLM_API_KEY")),
    option.WithBaseURL("https://api.pipellm.ai"),
  )

  message, _ := client.Messages.New(context.TODO(), anthropic.MessageNewParams{
    Model:     anthropic.F("claude-sonnet-4-5-20250929"),
    MaxTokens: anthropic.Int(1024),
    Messages: anthropic.F([]anthropic.MessageParam{
      anthropic.NewUserMessage(anthropic.NewTextBlock("Why is the sky blue?")),
    }),
  })
}

Request Parameters

Parameter	Type	Required	Description
`model`	string	Yes	Model ID (e.g., `claude-sonnet-4-5-20250929`)
`messages`	array	Yes	Array of message objects
`max_tokens`	integer	Yes	Maximum tokens to generate
`temperature`	number	No	Sampling temperature (0-1)
`stream`	boolean	No	Enable streaming response

Response Format

{
  "id": "msg_xxx",
  "type": "message",
  "role": "assistant",
  "content": [
    {"type": "text", "text": "The sky appears blue because..."}
  ],
  "model": "claude-sonnet-4-5-20250929",
  "stop_reason": "end_turn",
  "usage": {
    "input_tokens": 10,
    "output_tokens": 50
  }
}

Routing & Protocols

Native-route constraints and converter routes

Anthropic Overview

Headers, models, and route family overview

Anthropic Format Converter

Keep Anthropic format while calling other providers

Overview

Using the API

OpenAI Compatible

Anthropic

Gemini

Endpoint

Install SDKs

Code Examples

Request Parameters

Response Format

Routing & Protocols

Anthropic Overview

Anthropic Format Converter

Overview

Using the API

OpenAI Compatible

Anthropic

Gemini

​Endpoint

​Install SDKs

​Code Examples

​Request Parameters

​Response Format

​Related Docs

Routing & Protocols

Anthropic Overview

Anthropic Format Converter

Endpoint

Install SDKs

Code Examples

Request Parameters

Response Format

Related Docs