Claude Detector
Detect text from Anthropic Claude Opus 4.7, Sonnet 4.6 and Haiku 4.5. Distinguishes Claude prose from GPT-5 and Gemini outputs. 99.1% accuracy on the RAID benchmark. $1 in free scan credit on signup. Lifetime scan history on every plan.
How it works
Paste, scan, verify - in under two seconds.
Paste text
Drop in any text - essay, article, email, chat. No upload needed for short copy under 5,000 characters.
Cross-model analysis
Tokenisation, perplexity, burstiness and a learned classifier run in parallel. Median verdict in 1.6 seconds.
Per-sentence verdict
Get the AI score, confidence band, model attribution (GPT-5.5 vs Claude vs Gemini) and per-sentence highlights.
What the claude 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.
- 01/06TextAnthropicClaude Opus 4.7release Opus 4.7ActiveSentence-level
- 02/06TextAnthropicClaude Sonnet 4.6release Sonnet 4.6ActiveSentence-level
- 03/06TextAnthropicClaude Haiku 4.5release Haiku 4.5ActiveSentence-level
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 itFree forever, no card required
Try every text and image model. $1 in credit on signup.
Credit
- $1 in signup credit
- No top-ups
Modalities
Limits
- 25,000 chars / scan
- 5 MB per image
Features
- Per-sentence highlights
- Model attribution
- API access
Support
- Community
- Lifetime scan history
Starter
SoloBilled yearly - $54/year
Sentence-level highlights and bulk text scans for solo writers.
Credit
- $12 credit / month
- Top-up packs available
Modalities
Limits
- 75,000 chars / scan
- 10 MB per image
Features
- Per-sentence highlights
- Model attribution
- API access
Support
- Email · 72h
- Lifetime scan history
Pro
Multi-modalBilled yearly - $114/year
All four modalities with model attribution.
Credit
- $25 credit / month
- Top-up packs available
Modalities
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
ScaleBilled yearly - $294/year
API access and bulk pipelines for teams at scale.
Credit
- $75 credit / month
- Top-up packs available
Modalities
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
One-time top-ups
Top up any time. Bigger pack, bigger bonus.
Buy more credit without changing plans. Same balance, every modality.
| Compare plans | Free | Starter | Pro | Business |
|---|---|---|---|---|
| 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 / scan | 25,000 | 75,000 | 150,000 | 150,000 |
| Image size | 5 MB | 10 MB | 25 MB | 50 MB |
| Audio length | - | - | 10 min | 60 min |
| Video length | - | - | 5 min | 30 min |
| Scan history | Forever | Forever | Forever | Forever |
| Per-sentence highlights | ||||
| Model attribution | ||||
| API access | ||||
| Support | Community | Email · 72h | Email · 24h | Priority · 4h |
FAQ
Common questions about the claude detector.
The claude detector is tuned against Claude Opus 4.7, Claude Sonnet 4.6 and Claude Haiku 4.5. 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.