SummarizeAPI

Up to 56× cheaper than GPT-5.5 Pro. No compromises on quality.
Proprietary 400B model built exclusively for summarization. $5/month for 5,000 requests. $14/month for truly unlimited — no caps, no overages, ever.

Live Demo · API Docs · Pricing · Sign Up Free

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Why SummarizeAPI?

Most teams that need summarization at scale either pay a fortune for general-purpose LLMs (GPT-5.5 Pro charges ~$280/month for 5,000 requests) or build brittle in-house pipelines.

SummarizeAPI is different:

	SummarizeAPI	GPT-5.5 Pro API
5,000 requests/month	$5	~$280
Per request cost	$0.001	~$0.056
Unlimited requests	$14/month	Hundreds/month
Built for summarization	Purpose-built 400B model	General chatbot
Response focus	Summarization-optimized	Multi-task
Free tier	100 req/mo, no credit card	Pay-as-you-go only

Up to 56× cheaper per request than GPT-5.5 Pro. And because our model was trained exclusively on summarization tasks, it outperforms repurposed general models on precision, factual fidelity, and speed.

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Plans

Plan	Price	Requests	Best for
Free	$0/month	100/month	Testing & prototyping
Professional	$5/month	5,000/month	Startups & indie developers
Business	$14/month	Unlimited	Production apps, high-volume pipelines

Business Plan: Truly Unlimited

The Business plan has no request cap, no throttle, no overage fees. Whether you process 10,000 or 500,000 documents per month, the price stays the same: $14/month.

On GPT-5.5 Pro, that same unlimited volume would cost hundreds to thousands of dollars per month depending on text length. SummarizeAPI's Business plan is the only truly flat-rate, unlimited summarization API on the market.

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Features

• Proprietary 400B model — trained from scratch exclusively on summarization, not a general LLM repurposed for the task
• 119+ languages — auto-detected, native-quality output; summarize Arabic into French, Japanese into English, and more
• Real-time streaming — Server-Sent Events (SSE) for progressive UI rendering
• Output length control — short (2–3 sentences), medium (1 paragraph), long (2–3 paragraphs), extensive (4–5 paragraphs)
• Writing styles — professional, casual, academic, technical, simple
• Output formats — paragraph, bullets, mixed
• Keyword extraction — 5–7 key terms extracted per document
• Privacy-first — text is processed in real-time and immediately discarded; we never store or train on your content
• 99.9% uptime SLA (Business plan)

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Quick Start

1. Get your free API key at summarizeapi.com/signup — no credit card required.

2. Send your first request:

curl -X POST https://summarizeapi.com/api/summarize \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"text": "Your text here..."}'

3. Get your summary:

{
  "success": true,
  "summary": "A concise, high-quality summary of your text.",
  "keywords": null,
  "original_length": 1234,
  "summary_length": 287,
  "processing_time": 2.85,
  "requests_remaining": 99
}

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API Reference

Endpoint

POST https://summarizeapi.com/api/summarize

Authentication

Authorization: Bearer YOUR_API_KEY
Content-Type: application/json

Request Parameters

Parameter	Type	Default	Description
text	string	required	Text to summarize (50–50,000 characters)
length	string	medium	short · medium · long · extensive
style	string	professional	professional · casual · academic · technical · simple
format	string	paragraph	paragraph · bullets · mixed
outputLang	string	auto	Output language code (en, fr, es, de, ar, zh, ja, ...) or auto
includeKeywords	boolean	false	Extract 5–7 key terms

Response Fields

Field	Type	Description
success	boolean	true on success
summary	string	Generated summary
keywords	string|null	Comma-separated key terms (when includeKeywords: true)
original_length	integer	Input character count
summary_length	integer	Summary character count
processing_time	float	Duration in seconds
requests_remaining	integer	Remaining requests this billing period

Error Codes

Status	Meaning
400	Missing text, text too short, or malformed JSON
401	Invalid or missing API key
429	Monthly quota exceeded — upgrade or wait for reset
500	Server error — retry with exponential backoff

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Code Examples

JavaScript / Node.js

class SummarizeAPI {
  constructor(apiKey) {
    this.apiKey = apiKey;
    this.baseURL = 'https://summarizeapi.com/api';
  }

  async summarize(text, options = {}) {
    const res = await fetch(`${this.baseURL}/summarize`, {
      method: 'POST',
      headers: {
        'Authorization': `Bearer ${this.apiKey}`,
        'Content-Type': 'application/json'
      },
      body: JSON.stringify({ text, ...options })
    });
    if (!res.ok) throw new Error((await res.json()).error);
    return res.json();
  }
}

const client = new SummarizeAPI('YOUR_API_KEY');

const result = await client.summarize(
  'Your long text here...',
  { length: 'medium', style: 'professional', includeKeywords: true }
);

console.log(result.summary);
console.log(result.keywords);

Python

import requests

class SummarizeAPI:
    BASE_URL = "https://summarizeapi.com/api"

    def __init__(self, api_key: str):
        self.session = requests.Session()
        self.session.headers.update({"Authorization": f"Bearer {api_key}"})

    def summarize(self, text: str, **kwargs) -> dict:
        response = self.session.post(
            f"{self.BASE_URL}/summarize",
            json={"text": text, **kwargs}
        )
        response.raise_for_status()
        return response.json()

client = SummarizeAPI("YOUR_API_KEY")

result = client.summarize(
    text="Artificial intelligence is reshaping industries...",
    length="medium",
    style="professional",
    include_keywords=True
)

print(result["summary"])
print(f"Compressed by {100 - round(result['summary_length'] / result['original_length'] * 100)}%")

PHP

<?php

class SummarizeAPI {
    private string $apiKey;
    private string $baseUrl = 'https://summarizeapi.com/api';

    public function __construct(string $apiKey) {
        $this->apiKey = $apiKey;
    }

    public function summarize(string $text, array $options = []): array {
        $ch = curl_init($this->baseUrl . '/summarize');
        curl_setopt_array($ch, [
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_POST           => true,
            CURLOPT_POSTFIELDS     => json_encode(array_merge(['text' => $text], $options)),
            CURLOPT_HTTPHEADER     => [
                'Authorization: Bearer ' . $this->apiKey,
                'Content-Type: application/json'
            ],
            CURLOPT_TIMEOUT => 60
        ]);
        $body = curl_exec($ch);
        $code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);

        if ($code !== 200) {
            $err = json_decode($body, true);
            throw new RuntimeException($err['error'] ?? 'API error');
        }
        return json_decode($body, true);
    }
}

$client = new SummarizeAPI('YOUR_API_KEY');
$result = $client->summarize('Your text here...', ['length' => 'medium', 'includeKeywords' => true]);
echo $result['summary'];

Real-time Streaming (SSE)

Append ?stream=1 to receive the summary token by token:

const res = await fetch('https://summarizeapi.com/api/summarize?stream=1', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({ text: 'Your text here...' })
});

const reader = res.body.getReader();
const decoder = new TextDecoder();

while (true) {
  const { done, value } = await reader.read();
  if (done) break;

  const lines = decoder.decode(value).split('\n');
  for (const line of lines) {
    if (!line.startsWith('data: ')) continue;
    const event = JSON.parse(line.slice(6));
    if (event.type === 'summary') process.stdout.write(event.content);
    if (event.type === 'done')    console.log('\nFinished:', event.summary);
  }
}

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Use Cases

• News apps — Summarize articles in any language for readers on the go
• Legal tech — Condense contracts, filings, and case law into actionable briefs
• Research tools — Process academic papers, extract key findings and keywords
• Customer support — Summarize support tickets and conversation histories
• Content pipelines — Bulk-process thousands of documents per day on the Business plan (unlimited)
• E-learning — Convert dense course material into concise study notes
• Newsletter tools — Auto-generate digest summaries from RSS feeds

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Pricing Deep Dive

Why is SummarizeAPI so much cheaper?

General-purpose LLMs like GPT-5.5 Pro are designed to do everything: code, chat, reason, write. That generality is expensive. We built a 400-billion-parameter model trained exclusively on summarization — it does one thing and does it better than any general model.

The result: dramatically lower inference cost, which we pass directly to you.

The Business Plan math

Scenario	GPT-5.5 Pro	SummarizeAPI Business
10,000 requests/mo	~$560	$14
50,000 requests/mo	~$2,800	$14
100,000 requests/mo	~$5,600	$14

No caps. No overages. No surprises. $14/month, unlimited.

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Privacy & Security

• No data retention: text is processed in real-time and discarded immediately after summarization
• No training on your data: we never use your content to train or fine-tune models
• HTTPS only: all API traffic is encrypted in transit
• API key authentication: keys can be regenerated at any time from your dashboard

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Links

Resource	URL
Website	summarizeapi.com
API Documentation	summarizeapi.com/docs
Live Demo	summarizeapi.com/#demo
Dashboard	summarizeapi.com/dashboard
Pricing	summarizeapi.com/#pricing
Sign Up (Free)	summarizeapi.com/signup
Contact & Support	summarizeapi.com/contact

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Changelog

v1.0 — Initial Release

• REST API with JSON request/response
• Real-time SSE streaming
• 119+ languages (auto-detected)
• 5 writing styles, 4 output formats, 4 length options
• Keyword extraction
• Free tier: 100 requests/month, no credit card required
• Professional plan: $5/month, 5,000 requests
• Business plan: $14/month, unlimited requests

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Start for free. Scale without limits.

Get your free API key →

No credit card required. 100 free requests per month.