API Introduction

Welcome to Concentrate AI

The Concentrate AI Responses API provides a unified interface for interacting with multiple AI model providers. Access GPT 5.6, Claude Opus 5, Claude Fable 5, Gemini 3.1 Pro, Grok 4.20, and many other models through a single, normalized API with automatic routing and credit tracking.

Quickstart

Get started with your first API request in minutes

API Reference

View detailed endpoint documentation

Claude Code Setup

Use Claude Code with any model in our model fortress

Cursor Setup

Use models on Concentrate in Cursor

Key Features

Unified Interface

One API format works across all providers. No need to learn different request/response formats for OpenAI, Anthropic, Google, or other providers.

Automatic Routing

Use model: "auto" to automatically select the best model based on cost, performance, or latency. The API intelligently routes your requests based on real-time metrics.

Multi-Provider Support

Access models from OpenAI, Anthropic, Google Vertex, Google AI Studio, AWS Bedrock, Azure, Azure AI Foundry, xAI, Cohere, Mistral, Alibaba Cloud, Cloudflare, z.ai, MiniMax, DeepSeek, DeepInfra, Novita, Blue Lobster, and Concentrate through a single endpoint.

Streaming Responses

Enable real-time streaming via Server-Sent Events (SSE) for a responsive user experience. Works consistently across all providers.

Credit Tracking

Built-in usage tracking and billing integration. Monitor token usage, costs, and set spending limits.

Authentication

All API requests require authentication using an API key. Get your API key from the Concentrate.ai dashboard. Include your API key in the Authorization header:

Authorization: Bearer YOUR_API_KEY

Keep your API key secure. Never share it publicly or commit it to version control.

Base URL

https://api.concentrate.ai/v1

Supported Models

The API supports 157+ models from 21 authors across 19 providers:

26 models

GPT 5.6 Sol, GPT 5.6 Terra, GPT 5.6 Luna
GPT 5.5, GPT 5.4, GPT 5.4 Pro, GPT 5.4 Mini, GPT 5.4 Nano
GPT 5.3 Codex, GPT 5.2 Codex, GPT 5.1 Codex Max, GPT 5.1 Codex Mini
GPT 5.2, GPT 5.1, GPT 5, GPT 5 Mini, GPT 5 Nano
GPT 4.1, GPT 4.1 Mini, GPT 4o, GPT 4o Mini
o1 (reasoning)
gpt-oss 120B, gpt-oss 20B, gpt-oss Safeguard 120B / 20B

Check the Model Fortress page for complete listings, live pricing, and per-provider availability. You can also query /v1/models for real-time data.

Model Selection

You can specify models in three ways:

Model name only: "gpt-5.6-sol" - Automatic provider routing
Provider prefix: "openai/gpt-5.6-sol" - Specific provider
Auto routing: "auto" - Let the API choose based on your criteria

{
  "model": "gpt-5.6-sol",
  "input": "Hello, world!"
}

{
  "model": "anthropic/claude-opus-4-8",
  "input": "Hello, world!"
}

{
  "model": "auto",
  "input": "Hello, world!",
  "routing": {
    "strategy": "min",
    "metric": "cost"
  }
}

Quick Example

curl https://api.concentrate.ai/v1/responses \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "gpt-5.6-sol",
    "input": "What is the capital of France?"
  }'

import requests

response = requests.post(
    "https://api.concentrate.ai/v1/responses",
    headers={
        "Authorization": "Bearer YOUR_API_KEY",
        "Content-Type": "application/json"
    },
    json={
        "model": "gpt-5.4",
        "input": "What is the capital of France?"
    }
)

print(response.json())

const response = await fetch("https://api.concentrate.ai/v1/responses", {
  method: "POST",
  headers: {
    "Authorization": "Bearer YOUR_API_KEY",
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    model: "gpt-5.4",
    input: "What is the capital of France?"
  })
});

const data = await response.json();
console.log(data);

interface ResponseRequest {
  model: string;
  input: string | Array<{role: string; content: string}>;
  stream?: boolean;
  temperature?: number;
  max_output_tokens?: number;
}

const response = await fetch("https://api.concentrate.ai/v1/responses", {
  method: "POST",
  headers: {
    "Authorization": "Bearer YOUR_API_KEY",
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    model: "gpt-5.4",
    input: "What is the capital of France?"
  } as ResponseRequest)
});

const data = await response.json();
console.log(data);

Response Format

All responses follow a normalized format regardless of provider:

{
  "id": "resp_abc123",
  "created_at": 1702934400,
  "status": "completed",
  "model": "openai/gpt-5.6-sol",
  "output": [
    {
      "type": "message",
      "id": "msg_xyz789",
      "status": "completed",
      "role": "assistant",
      "content": [
        {
          "type": "output_text",
          "text": "The capital of France is Paris."
        }
      ]
    }
  ],
  "usage": {
    "input_tokens": 12,
    "input_tokens_details": {
      "cached_tokens": 0
    },
    "output_tokens": 8,
    "output_tokens_details": {
      "reasoning_tokens": 0
    },
    "total_tokens": 20
  }
}

Error Handling

The API uses standard HTTP status codes:

Status Code	Description
`200`	Successful request
`400`	Bad request - Invalid parameters
`401`	Unauthorized - Invalid API key
`402`	Payment required - Insufficient credits
`424`	Failed dependency - Provider error
`500`	Internal server error

View Error Examples

See detailed error response formats and troubleshooting

Rate Limits

Rate limits are applied per API key and are based on your subscription tier. Limits are enforced using token bucket algorithm with per-minute windows.

Contact support to increase your rate limits or discuss enterprise pricing.

Next Steps

Quickstart Guide

Make your first API call

Create Response

Full endpoint documentation

Streaming

Learn about streaming responses

Auto Routing

Automatic model selection

API Documentation

Responses

Chat Completions (Beta)

Messages (Beta)

Models

Utilities

Features

Reference

Welcome to Concentrate AI

Quickstart

API Reference

Claude Code Setup

Cursor Setup

Key Features

Authentication

Base URL

Supported Models

Model Selection

Quick Example

Response Format

Error Handling

View Error Examples

Rate Limits

Next Steps

Quickstart Guide

Create Response

Streaming

Auto Routing

​Welcome to Concentrate AI

Quickstart

API Reference

Claude Code Setup

Cursor Setup

​Key Features

​Authentication

​Base URL

​Supported Models

​Model Selection

​Quick Example

​Response Format

​Error Handling

View Error Examples

​Rate Limits

​Next Steps

Quickstart Guide

Create Response

Streaming

Auto Routing

Welcome to Concentrate AI

Key Features

Authentication

Base URL

Supported Models

Model Selection

Quick Example

Response Format

Error Handling

Rate Limits

Next Steps