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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 an OpenAI Responses-compatible API gateway. Keep the Responses API request format, replace the base URL, and use your APIXO API key.

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What to change

SettingAPIXO value
SDK Base URLhttps://llm.apixo.ai/v1
EndpointPOST /responses
Request URLhttps://llm.apixo.ai/v1/responses
API keyAPIXO_API_KEY from APIXO API Keys
API key headerAuthorization: Bearer $APIXO_API_KEY
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/responses" \
  -H "Authorization: Bearer $APIXO_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.4",
    "input": "Say hello in one sentence."
  }'

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Streaming

curl -N -X POST "https://llm.apixo.ai/v1/responses" \
  -H "Authorization: Bearer $APIXO_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.4",
    "stream": true,
    "input": "Write a short changelog summary."
  }'

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SDK example

Use the OpenAI SDK with APIXO’s Responses-compatible base URL. 
import OpenAI from "openai";

const client = new OpenAI({
  apiKey: process.env.APIXO_API_KEY,
  baseURL: "https://llm.apixo.ai/v1"
});

const response = await client.responses.create({
  model: "gpt-5.4",
  input: "Say hello in one sentence."
});

console.log(response.output_text);

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Supported OpenAI models

  • gpt-5.4
  • gpt-5.4-pro
  • gpt-5.4-mini
  • gpt-5.4-nano
  • gpt-5.2
  • gpt-5.1

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Troubleshooting

  • 401: missing or invalid API key
  • 400: invalid Responses API request body or unsupported model id
  • 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.