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Documentation Index

Fetch the complete documentation index at: https://apixo.ai/docs/llms.txt

Use this file to discover all available pages before exploring further.

Use APIXO as a Claude-compatible API gateway. Keep the Anthropic Messages request format, replace the base URL, and use your APIXO API key.

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What to change

SettingAPIXO value
Base URLhttps://llm.apixo.ai
Request URLhttps://llm.apixo.ai/v1/messages
API keyAPIXO_API_KEY from APIXO API Keys
API key headerx-api-key
Required version headeranthropic-version: 2023-06-01
Model locationRequest body model

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Quickstart

export APIXO_API_KEY="your_apixo_api_key"

curl -X POST "https://llm.apixo.ai/v1/messages" \
  -H "x-api-key: $APIXO_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-sonnet-4-6",
    "max_tokens": 256,
    "messages": [
      {"role": "user", "content": "Explain RAG in 3 bullets."}
    ]
  }'

​
Streaming

curl -N -X POST "https://llm.apixo.ai/v1/messages" \
  -H "x-api-key: $APIXO_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-sonnet-4-6",
    "stream": true,
    "max_tokens": 256,
    "messages": [
      {"role": "user", "content": "Write a short release note."}
    ]
  }'

​
SDK example

Use the Anthropic SDK with APIXO’s base URL. 
import Anthropic from "@anthropic-ai/sdk";

const client = new Anthropic({
  apiKey: process.env.APIXO_API_KEY,
  baseURL: "https://llm.apixo.ai"
});

const resp = await client.messages.create({
  model: "claude-sonnet-4-6",
  max_tokens: 256,
  messages: [{ role: "user", content: "Say hello in one sentence." }]
});

console.log(resp.content);

​
Supported Claude models

  • claude-opus-4-7
  • claude-opus-4-6
  • claude-opus-4-6-thinking
  • claude-opus-4-5-20251101
  • claude-opus-4-5-20251101-thinking
  • claude-sonnet-4-6
  • claude-sonnet-4-6-thinking
  • claude-sonnet-4-5-20250929
  • claude-sonnet-4-5-20250929-thinking
  • claude-haiku-4-5-20251001
  • claude-haiku-4-5-20251001-thinking

​
Troubleshooting

  • 401: missing or invalid API key
  • 400: invalid Messages API request body, unsupported model id, or missing max_tokens
  • 429: rate limit or temporary capacity limit
  • 502 / 504: upstream provider error or timeout
Retry 429, 502, and 504 with backoff. Fix 400 and 401 before retrying.