Messages - Portrix docs

Anthropic-compatible Messages API on PipeLLM

Endpoint

POST https://api.portix.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.portix.ai/v1/messages \
  -H "Content-Type: application/json" \
  -H "x-api-key: $YOUR_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('YOUR_API_KEY'),
  base_url='https://api.portix.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.YOUR_API_KEY,
  baseURL: 'https://api.portix.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("YOUR_API_KEY")),
    option.WithBaseURL("https://api.portix.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
  }
}

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