aidetectors
Text · 2026 models

ChatGPT Detector

Detect text written by ChatGPT (GPT-5.5, GPT-5.5 Pro, GPT-5.4) with 99.1% accuracy. Free $1 credit on signup. Lifetime history. 99.1% accuracy on the RAID benchmark. $1 in free scan credit on signup. Lifetime scan history on every plan.

See how it works
Lifetime scan history on every plan. No retention tier.
Try an example:
0 / 5,000 characters

How it works

Paste, scan, verify - in under two seconds.

01

Paste text

Drop in any text - essay, article, email, chat. No upload needed for short copy under 5,000 characters.

02

Cross-model analysis

Tokenisation, perplexity, burstiness and a learned classifier run in parallel. Median verdict in 1.6 seconds.

03

Per-sentence verdict

Get the AI score, confidence band, model attribution (GPT-5.5 vs Claude vs Gemini) and per-sentence highlights.

Coverage roster

What the chatgpt detector actually catches.

Six headline generators, sampled across every modality we cover. Each entry is benchmarked monthly against the vendor's latest release - we cycle the roster instead of padding it.

2026·Q2 catalog
  • 01/06Text
    OpenAI
    GPT-5.5
    release 5.5
    Active
    RAID benchmark
  • 02/06Text
    OpenAI
    GPT-5.5 Pro
    release 5.5 Pro
    Active
    Long-form essays
  • 03/06Text
    OpenAI
    GPT-5.4
    release 5.4
    Active
    Legacy fallback

Accuracy & methodology

Benchmark first. Hype never.

We benchmark at 99.1% accuracy on the RAID benchmark across GPT-5.5, GPT-5.5 Pro and Claude Opus 4.7 outputs, with a 1.2% false-positive rate. The detection methodology is a cross-model ensemble combining tokenisation patterns, perplexity, burstiness and a learned classifier. Confidence bands are surfaced on every result so you can decide what to do with the verdict.

Use cases

Who uses it.

Educators

Detect AI-written essays before grading. Per-sentence highlights show exactly which lines came from a model.

Publishers & editors

Verify freelance submissions and PR pitches at scale. Bulk upload supports 50 files per scan on Pro.

Recruiters

Check candidate take-homes and cover letters for authenticity without false-flagging legitimate writers.

SEO & content teams

Audit your own pipeline. Catch low-effort AI drafts before they ship to the CMS.

Comparison

How does this compare to other detectors?

We're honest about competitor strengths. Most are text-only; ai-detectors.io is the multi-modal alternative with $1 in free credit instead of a $14.95 paid minimum.

Pricing

One credit pool. Four plans.

Lifetime scan history on every plan. Same accuracy across every model. No retention tier, no per-modality caps to juggle.

Save 50% paying yearly. Upgrade or cancel any time.

Free

Try it
$0

Free forever, no card required

Try every text and image model. $1 in credit on signup.

Credit

  • $1 in signup credit
  • No top-ups

Modalities

    TextImageAudioVideo

Limits

  • 25,000 chars / scan
  • 5 MB per image

Features

  • Per-sentence highlights
  • Model attribution
  • API access

Support

  • Community
  • Lifetime scan history

Starter

Solo
$4.50/ month

Billed yearly - $54/year

Sentence-level highlights and bulk text scans for solo writers.

Credit

  • $12 credit / month
  • Top-up packs available

Modalities

    TextImageAudioVideo

Limits

  • 75,000 chars / scan
  • 10 MB per image

Features

  • Per-sentence highlights
  • Model attribution
  • API access

Support

  • Email · 72h
  • Lifetime scan history
Most popular

Pro

Multi-modal
$9.50/ month

Billed yearly - $114/year

All four modalities with model attribution.

Credit

  • $25 credit / month
  • Top-up packs available

Modalities

    TextImageAudioVideo

Limits

  • 150,000 chars / scan
  • 25 MB per image
  • 10 min per audio
  • 5 min per video

Features

  • Per-sentence highlights
  • Model attribution
  • API access

Support

  • Email · 24h
  • Lifetime scan history

Business

Scale
$24.50/ month

Billed yearly - $294/year

API access and bulk pipelines for teams at scale.

Credit

  • $75 credit / month
  • Top-up packs available

Modalities

    TextImageAudioVideo

Limits

  • 150,000 chars / scan
  • 50 MB per image
  • 60 min per audio
  • 30 min per video

Features

  • Per-sentence highlights
  • Model attribution
  • API access

Support

  • Priority · 4h
  • Lifetime scan history
7-day money-back guarantee·Lifetime scan history·Cancel any time·Full feature comparison

One-time top-ups

Top up any time. Bigger pack, bigger bonus.

Buy more credit without changing plans. Same balance, every modality.

Compare plansFreeStarterProBusiness
Monthly$0$9$19$49
Annual (-50%)-$4.50$9.50$24.50
Credit$1 (signup)$12/mo$25/mo$75/mo
Top-up
Text
Image
Audio
Video
Characters / scan25,00075,000150,000150,000
Image size5 MB10 MB25 MB50 MB
Audio length--10 min60 min
Video length--5 min30 min
Scan historyForeverForeverForeverForever
Per-sentence highlights
Model attribution
API access
SupportCommunityEmail · 72hEmail · 24hPriority · 4h

FAQ

Common questions about the chatgpt detector.

The chatgpt detector is tuned against GPT-5.5, GPT-5.5 Pro and GPT-5.4. New models are added to the ensemble within 30 days of release.

We benchmark at 99.1% accuracy on the RAID benchmark with a 1.2% false-positive rate for text, and 96.9-98.4% across image, audio and video. Every verdict ships with a confidence band so you know how certain the result is.

Edited prose, technical writing and ESL writing are common false-positive triggers for naive detectors. We tune against those failure modes specifically and surface confidence so a low-certainty AI verdict reads differently from a high-certainty one.

Yes. Every plan keeps every scan forever - Free included. There is no retention tier and never will be. You can delete an individual scan from /dashboard/history at any time.

No. Uploads are processed in-memory and never used to train detectors. We are SOC 2 in progress and ship a Data Processing Addendum.

Every signup gets $1 in scan credit, usable across every detector model - text, image, audio, video. There is no expiry while your account is active.

Yes - Starter handles 10 files at once, Pro 50 and Business 500. Drop a folder into the dashboard and we'll scan everything in parallel.

Yes - included on the Business plan. The API mirrors the dashboard, supports streaming results for long videos and ships an OpenAPI spec.

We don't sell humanisers, evasion or AI-paraphrasing. We're a verdict tool. If you want to bypass detection, this isn't the product for you.

Detector library

Other detectors you might need

Detection is multi-modal. The same scan and the same credit pool work across every tool.

Get $1 free credit - start scanning.

Lifetime scan history. Every plan. No retention tier.