Claude humanizer: 12 hosted tools and one open-source skill on the same fields
The hosted tools are ordered by per-request cap, largest first, because a Claude answer arrives as one block and a tool that takes it whole produces one rewrite rather than a stitched set. "Names Claude" records whether the vendor's own product page lists Claude as a source of text it rewrites, read on 9 November 2026. Plan figures come from each vendor's pricing or product page, checked on 8 November 2026. The skill sits last because its cap is your agent's context window rather than a vendor number. No column is a detector reading. The published run's 24 inputs include text generated with Claude, and the Claude subset column will be added to this table when the first run publishes.
None of those lines mentions a detector reading, because none can yet.
What does Anthropic say Claude text carries?
Anthropic's help article, updated the week of 9 November 2026, states that when a supported Claude model generates text it weaves an imperceptible watermark into the text itself, that the mark travels with the text when copied and may persist through some editing, that it is applied at the model level so it is present in every Claude product and on cloud partners, and that it applies worldwide (Claude Help Center, How Claude marks AI-generated content, read 9 November 2026). The same article lists the covered models in a table and says Anthropic is adding marks to models released before 2 August 2026, the date the EU's transparency rules took effect, and that detection is in private preview for eligible organisations such as regulators, researchers, educational organisations and enterprises checking their own output.
| What Anthropic states | Detail | Source and date read |
|---|---|---|
| Where the mark lives | In the text, at the model level; present in the API, the apps, Claude Code and on cloud partners | Help article, 9 November 2026 |
| Method | A version of SynthID-Text, published by Google DeepMind in 2024; the watermark changes only the source of randomness used to pick among equally good words | Explainer of 14 August 2026, read 9 November 2026 |
| Effect on output | No practical impact on quality, no extra tokens, no hidden characters, no information about the user | Explainer of 14 August 2026 |
| Light edits | "Light editing probably won't remove the watermark completely" | Explainer of 14 August 2026 |
| Full rewrite | "A complete rewrite where every word is replaced will" remove it | Explainer of 14 August 2026 |
| Proofreading a human draft | Nearly all words are the person's, so there is little for the mark to attach to and Claude's involvement may not be detectable | Explainer of 14 August 2026 |
| Short or factual passages | Fewer free word choices, so the mark is sparser and detection needs length | Explainer of 14 August 2026 |
| What it proves | That Claude was likely involved at some point; it cannot separate writing from heavy editing | Explainer of 14 August 2026 |
| Who can check | Detection API in private preview for eligible organisations; access to expand over time | Help article and explainer, 9 November 2026 |
The explainer is Anthropic's own account of the mechanism and its limits (Anthropic, How Claude's text watermark works, published 14 August 2026, read 9 November 2026). It describes the watermark as a version of SynthID-Text, which Google states adjusts the probability scores a model assigns to candidate words to embed a mark that does not affect output quality (Google DeepMind, SynthID, read 9 November 2026). The family goes back to the green-token method Kirchenbauer and colleagues published in 2023, where a detector tests a span of tokens for too many favoured words without access to the model (Kirchenbauer et al. 2023, arXiv 2301.10226, read 9 November 2026). The general explainer is the AI text watermarks guide.
What does the watermark mean for a Claude humanizer?
Three things, each from Anthropic's own statements. First, a humanizer that rewrites heavily is doing the one thing Anthropic says removes the mark, and a tool on a light setting is doing the thing Anthropic says leaves most of it. Which setting a vendor's mode name corresponds to is not published by any vendor on this page. Second, if the humanizer is itself a Claude model, as the open-source skill is by definition and as some hosted tools may be without saying so, the output is a fresh Claude generation and is marked again. Third, nobody outside the private preview can check, so a vendor page that sells a "Claude watermark remover" is selling a result no public instrument can confirm; two of the twelve vendors advertise such a feature, read on 9 November 2026, and this page records only what Anthropic documents.
| If you | Anthropic's statements imply | What this site can show |
|---|---|---|
| Paste a Claude answer into a hosted humanizer on a light mode | Most of the mark stays | Nothing yet; the detectors in the method read text statistics, not Anthropic's key |
| Run a strong mode that changes most words | The mark is removed or weakened; the meaning may move with it | Meaning kept and errors added, rated blind by two editors, once a run publishes |
| Run the blader/humanizer skill inside Claude | The output is a new Claude generation, marked again | The same two ratings, once a run publishes |
| Edit by hand | Each word you change removes a little of the count | Nothing to show; the text is yours to the extent you rewrote it |
The detectors this site uses, GPTZero, Originality.ai, Copyleaks, Pangram and ZeroGPT, do not hold Anthropic's key. Anthropic's explainer says as much: detection software looks at phrasing tells, which is a different method from checking for a watermark. So a reading from any of the five says nothing about whether the mark survived, and a detector label of human on a Claude answer is not the same as an unmarked answer. No detector score should be the only evidence in a misconduct case.
How long is a Claude answer, and which caps fit it?
The published method uses 24 AI-written inputs across six genres, with the school essay paragraph set at 350 to 500 words, and that range is the yardstick for a typical long answer. A 500-word Claude answer fits Phrasly, Clever AI Humanizer, HIX Bypass, StealthGPT, GPTHuman, Walter Writes AI and WriteHuman Basic in one request; it is four passes on QuillBot free at 125 words per input and seven on BypassGPT free at 80. A long Claude draft of 2,000 words, the kind that comes from a multi-turn session pasted together, fits only Phrasly paid, Clever AI Humanizer and HIX Bypass in one request, and is three passes on Walter Writes AI's Starter plan at 750 words. Splitting matters more for Claude text than it might seem: Anthropic says the mark is sparser on short passages, so the pieces of a split draft are each less checkable than the whole, and each piece is also a separate rewrite whose terms can drift from its neighbours.
| Claude draft length | One request on | Two or more requests on |
|---|---|---|
| Under 125 words (a short reply) | Every tool with a stated cap except BypassGPT free (80) | BypassGPT free |
| 350 to 500 words (the method's essay paragraph set) | Phrasly, Clever AI Humanizer, HIX Bypass, StealthGPT, GPTHuman, Walter Writes AI, WriteHuman Basic | QuillBot free, BypassGPT free, WriteHuman free (250) |
| 750 to 1,000 words (a long answer) | Phrasly, Clever AI Humanizer, HIX Bypass, StealthGPT, GPTHuman (at 1,000) | Walter Writes AI Starter (750), WriteHuman Basic (600) |
| 2,000 to 3,000 words (a session pasted together) | Phrasly paid (5,000), Clever AI Humanizer (3,000), HIX Bypass (3,000), the skill (context window) | Everything else with a stated cap |
Caps from each vendor's pricing or product page, checked on 8 November 2026. Verva, Undetectable AI and Grammarly state no per-request cap, so they do not appear in the "one request" column; an unstated cap is a cap the vendor has not published, not a cap of zero.
Anthropic states that text generated by supported Claude models carries an imperceptible watermark, applied at the model level and present wherever Claude is used, in a help article read on 9 November 2026 and an explainer published on 14 August 2026. That is the fact that separates a Claude humanizer search from any other: the text being rewritten is marked by its maker, and the maker has said what a rewrite does to the mark. This page sets out what Anthropic states, lists the twelve hosted humanizers in this site's test set on the same fields with whether each names Claude, adds the one open-source skill that runs inside Claude itself, and links the pages it sits beside, the best-for hub and the full humanizer ranking.
Updated
Short answer
Anthropic states that text generated by supported Claude models carries an imperceptible watermark, applied at the model level and present wherever Claude is used, in a help article updated the week of 9 November 2026 and an explainer published on 14 August 2026. That changes the Claude humanizer question: a rewrite is acting on marked text, and Anthropic says a light edit leaves most of the mark in place while a rewrite that replaces every word removes it. Eleven of the twelve hosted humanizers in this site's test set name Claude on their own pages as a supported source, read on 9 November 2026, and one open-source skill, blader/humanizer, runs inside Claude itself. All thirteen are listed below on the same fields: free tier, cheapest plan, per-request cap and named modes.
- Sample 01: Phrasly
- Sample 02: Clever AI Humanizer
- Sample 03: HIX Bypass
- Sample 04: StealthGPT
- Sample 05: GPTHuman
- Sample 06: Walter Writes AI
- Sample 07: WriteHuman
- Sample 08: QuillBot AI Humanizer
- Sample 09: BypassGPT
- Sample 10: Verva (formerly TwainGPT)
- Sample 11: Undetectable AI
- Sample 12: Grammarly AI Humanizer
- Sample 13: blader/humanizer (open-source skill)
Which humanizers accept Claude output, and on what fields?
Mode names are the vendor's own and describe a setting, not a measured amount of change. Price is reported, never ranked.
| Order | Tool | Names Claude | Best for | Main limitation | Free tier | Cheapest plan (checked on 8 November 2026) | Per-request cap | Named modes | Review |
|---|---|---|---|---|---|---|---|---|---|
| 01 |  Phrasly | Yes | Long Claude drafts in one request with a strength ladder | Trial costs $2 for three days and caps a request at 800 words | One free humanization a day, up to 500 words, no sign-up (read 9 November 2026); $2 three-day access | Unlimited, $10.99 a month billed annually | 800 trial, 5,000 paid | Balanced, Strong, Max | Review of Phrasly |
| 02 | Clever AI Humanizer | Page did not render | Long drafts free, no account | No paid tier to move to if the free service changes | 3,000 words per request, no monthly cap stated | None (free only) | 3,000 words | Normal, Clear & Structured | Review of Clever AI Humanizer |
| 03 |  HIX Bypass | Yes | Long requests on a small monthly pool | 5,000 words a month on Standard is a few documents | None stated | Standard, 5,000 words a month, $14.99 monthly or $9.99 a month yearly | 3,000 words | Fast, Aggressive, Latest | Review of HIX Bypass |
| 04 |  StealthGPT | Yes | A large monthly pool | No free tier; $1 three-day trial; the highest list price here | None; $1 three-day trial | Pro, 50,000 words a month, $29.99 monthly | 1,000 words | Not stated on the pricing page | Review of StealthGPT |
| 05 |  GPTHuman | Yes | Whole Claude answers on a mid-sized monthly pool | No modes named, so the amount of change cannot be set | 300-word trial | Starter, 25,000 words a month, $15 monthly or $8.25 a month yearly | 1,000 words (Starter) | Not stated | Review of GPTHuman |
| 06 |  Walter Writes AI | Yes | A strength setting per request and a large monthly pool | 750 words a request on Starter, so a long answer is two passes | 300-word trial, no card | Starter, 30,000 words a month, $8 a month billed $96 yearly | 750 words (Starter) | Simple, Standard, Enhanced | Review of Walter Writes AI |
| 07 |  WriteHuman | Yes | A few short pieces a month | 600 words a request on Basic; 3 free requests a month | 3 requests a month, 250 words each | Basic, 80 requests a month, $12 a month billed yearly or $20 monthly | 600 words (Basic) | Basic, Enhanced quality | Review of WriteHuman AI |
| 08 | QuillBot AI Humanizer | Yes | One paragraph at a time inside a paraphrasing suite | 125 words per input free, Basic mode only | 125 words per input, 3 uses of Advanced | Premium, $8.33 a month billed annually | 125 free; none stated paid | Basic, Advanced | Review of QuillBot AI Humanizer |
| 09 |  BypassGPT | Yes | Trying a mode ladder on very short text | 80 words per input free; paid prices did not render | 150 words a month, 80 words per input | Not published here | 80 words free | Fast, Creative, Enhanced | Review of BypassGPT |
| 10 | Verva (formerly TwainGPT) | Yes | A small humanizer pool at a low yearly price | No per-request cap or modes stated on the pricing page | Not stated | Basic, 8,000 humanizer words, $8 a month billed annually | Not stated | Not stated | |
| 11 |  Undetectable AI | Yes | Short texts on a small yearly budget | No request cap and no modes stated, so a lighter rewrite cannot be chosen | 250 words in total | 10,000 words a month, $5.00 a month billed $60.00 yearly | Not stated | None named | Review of Undetectable AI |
| 12 |  Grammarly AI Humanizer | Yes | People already paying for Grammarly | Pro is priced in "AI prompts", not words, so a humanizer allowance cannot be stated | Free plan; humanizer described as free to use, basic humanization | Pro, $12 (billing period not stated on the card) | Not stated | 4 preset voices, names not stated | Review of Grammarly AI Humanizer |
| 13 | blader/humanizer (open-source skill) | Runs inside Claude | People who already work in Claude Code, Codex or another agent and want readable rules | Its README states detectors still flag most of its output; output is a new Claude generation, so it is marked | Free, MIT licence | None | Your agent's context window | None; a 26-pattern rule list | Review of blader/humanizer |
Which Claude humanizer should you choose?
One line per job. Each name links to its full review.
- Choose Phrasly if your Claude drafts run past 3,000 words and you will pay for a plan.
- Choose Clever AI Humanizer if you want a whole draft rewritten free with no account and accept that it has no paid tier.
- Choose HIX Bypass if you have a few long drafts a month and want a named mode ladder.
- Choose StealthGPT if you need a large monthly pool and accept the highest list price here.
- Choose GPTHuman if your answers stay under 1,000 words and you do not need a strength setting.
- Choose Walter Writes AI if you want to set the strength per request and your answers stay under 750 words.
- Choose WriteHuman if you have two or three short pieces a month.
- Choose QuillBot AI Humanizer if you work one paragraph at a time and want a free tier that renews.
- Choose BypassGPT only to try a mode ladder on very short text, since paid prices did not render.
- Choose Verva if 8,000 humanizer words a month at a low yearly price is enough and you can live without a stated cap.
- Choose Undetectable AI only if a small yearly bill matters more than mode control.
- Choose Grammarly AI Humanizer if you already pay for Grammarly and want a light rewrite inside it.
- Choose the blader/humanizer skill if you already work in Claude Code, Codex or another agent, want rules you can read and edit, and accept that detector readings are not what it is for.
How the ranking works
- Inputs
- 24 texts24 AI-written inputs across six genres plus 6 human-written controls, the same set for every tool.
- Detectors
- 5 namedGPTZero, Originality.ai, Copyleaks, Pangram and ZeroGPT.
- Weights
- Meaning kept35
- Errors introduced20
- Detector pass rate30
- Limits and access15
- Run date
The thirteen options on the same fields
Every free tier gets the same fields, in rank order. The disc is the sample number it was poured under in the full run.
Sample 01: Phrasly
Phrasly's humanizer page names ChatGPT, Claude, Gemini and DeepSeek as sources it accepts, read on 9 November 2026, and its pricing page sells three days of access for $2 and an Unlimited plan at $10.99 a month billed annually, with 800 words per request on the trial and 5,000 paid, checked on 8 November 2026.
- Names Claude
- yes.
- Best for
- long Claude drafts in one request with a strength ladder.
- Main limitation
- the trial is paid and capped at 800 words a request.
- Free tier
- none; $2 for three days.
- Cheapest plan
- Unlimited, $10.99 a month billed annually, checked on 8 November 2026.
- Per-request cap
- 800 trial, 5,000 paid.
- Named modes
- Balanced, Strong, Max.
Sample 02: Clever AI Humanizer
Clever AI Humanizer is free with no stated monthly cap, accepts 3,000 words per request with no sign-up, and names two modes, Normal and Clear & Structured, checked on 8 November 2026. Its page returned no readable content on 9 November 2026, so whether it names Claude is not recorded here.
- Names Claude
- page did not render.
- Best for
- long drafts free, no account.
- Main limitation
- no paid tier to move to if the free service changes.
- Free tier
- 3,000 words per request, no monthly cap stated.
- Cheapest plan
- none.
- Per-request cap
- 3,000 words.
- Named modes
- Normal, Clear & Structured.
Sample 03: HIX Bypass
HIX Bypass, formerly at bypass.hix.ai, states on its homepage that it rewrites content generated by ChatGPT, Claude or Gemini, read on 9 November 2026, and sells Standard at 5,000 words a month for $14.99 monthly or $9.99 a month billed yearly with a 3,000-word request cap, checked on 8 November 2026.
- Names Claude
- yes.
- Best for
- long requests on a small monthly pool.
- Main limitation
- 5,000 words a month on Standard is a few documents.
- Free tier
- none stated.
- Cheapest plan
- Standard, 5,000 words a month, $9.99 a month billed yearly, checked on 8 November 2026.
- Per-request cap
- 3,000 words.
- Named modes
- Fast, Aggressive, Latest.
Sample 04: StealthGPT
StealthGPT's homepage names Claude through a "Claude watermark detector" and a "Claude watermark remover" use case, read on 9 November 2026, claims this page does not adopt because Anthropic's detector is private; its pricing page has no free tier, sells a $1 three-day trial, caps a request at 1,000 words and prices Pro at 50,000 words a month for $29.99 monthly, checked on 8 November 2026.
- Names Claude
- yes.
- Best for
- a large monthly pool.
- Main limitation
- no free tier and the highest monthly list price on this page.
- Free tier
- none; $1 three-day trial.
- Cheapest plan
- Pro, 50,000 words a month, $29.99 monthly, checked on 8 November 2026.
- Per-request cap
- 1,000 words.
- Named modes
- not stated on the pricing page.
Sample 05: GPTHuman
GPTHuman's homepage offers sample texts labelled ChatGPT, Claude and Gemini and says it humanizes outputs from those models, read on 9 November 2026; its Starter plan gives 25,000 words a month for $15 monthly or $8.25 a month billed $99 yearly with a 1,000-word request cap, and the trial is 300 words, checked on 8 November 2026.
- Names Claude
- yes.
- Best for
- whole Claude answers on a mid-sized monthly pool.
- Main limitation
- no modes named, so the amount of change cannot be set.
- Free tier
- 300-word trial.
- Cheapest plan
- Starter, 25,000 words a month, $8.25 a month billed yearly, checked on 8 November 2026.
- Per-request cap
- 1,000 words on Starter.
- Named modes
- not stated.
Sample 06: Walter Writes AI
Walter Writes AI's homepage says it turns ChatGPT, Claude and Gemini drafts into writing that sounds like the user, read on 9 November 2026, and documents three modes, Simple, Standard and Enhanced; Starter gives 30,000 words a month for $8 a month billed $96 yearly with a 750-word cap per request, and the trial is 300 words with no card, checked on 8 November 2026.
Vendor site: Walter Writes AI.
- Names Claude
- yes.
- Best for
- a strength setting per request and a large monthly pool.
- Main limitation
- 750 words a request on Starter turns a long answer into two passes and a 2,000-word draft into three.
- Free tier
- 300-word trial, no card.
- Cheapest plan
- Starter, 30,000 words a month, $8 a month billed $96 yearly, checked on 8 November 2026.
- Per-request cap
- 750 words on Starter.
- Named modes
- Simple, Standard, Enhanced.
Sample 07: WriteHuman
WriteHuman's homepage states that it works with writing from ChatGPT, Claude, Gemini, Grok and DeepSeek, read on 9 November 2026; its free plan allows 3 requests a month at 250 words each, and Basic gives 80 requests a month at 600 words each for $12 a month billed yearly or $20 monthly, checked on 8 November 2026.
- Names Claude
- yes.
- Best for
- a few short pieces a month.
- Main limitation
- 600 words a request on Basic, and the free tier is three requests.
- Free tier
- 3 requests a month, 250 words each.
- Cheapest plan
- Basic, 80 requests a month, $12 a month billed yearly, checked on 8 November 2026.
- Per-request cap
- 250 free, 600 on Basic.
- Named modes
- Basic, Enhanced quality.
Sample 08: QuillBot AI Humanizer
QuillBot's humanizer page names ChatGPT, Gemini, Claude and DeepSeek as sources, read on 9 November 2026; the free tier is Basic mode at 125 words per input, and Premium at $8.33 a month billed annually removes the word limit and adds Advanced mode, checked on 8 November 2026.
- Names Claude
- yes.
- Best for
- one paragraph at a time, as often as needed.
- Main limitation
- 125 words per input free, and only Basic mode.
- Free tier
- 125 words per input, Basic mode, 3 uses of Advanced.
- Cheapest plan
- Premium, $8.33 a month billed annually, checked on 8 November 2026.
- Per-request cap
- 125 words free; none stated on Premium.
- Named modes
- Basic, Advanced.
Sample 09: BypassGPT
BypassGPT's homepage says its model was trained on text produced by GPT-3.5 and GPT-4, Claude and Bard or Gemini, read on 9 November 2026; its free tier is 150 words a month at 80 words per input with Fast, Creative and Enhanced modes, and its paid prices did not render on 8 November 2026.
- Names Claude
- yes, as training data.
- Best for
- trying a mode ladder on very short text.
- Main limitation
- 80 words per input free, and no paid price could be read.
- Free tier
- 150 words a month, 80 words per input.
- Cheapest plan
- not published here.
- Per-request cap
- 80 words free.
- Named modes
- Fast, Creative, Enhanced.
Verva (formerly TwainGPT)
Verva, the renamed TwainGPT, says on its humanizer page that it turns text from ChatGPT, Claude and Gemini into natural writing, read on 9 November 2026; its Basic plan gives 8,000 humanizer words for $8 a month billed annually, with no per-request cap or modes stated on the pricing page, checked on 8 November 2026.
- Names Claude
- yes.
- Best for
- a small humanizer pool at a low yearly price.
- Main limitation
- no per-request cap or modes stated.
- Free tier
- not stated.
- Cheapest plan
- Basic, 8,000 humanizer words, $8 a month billed annually, checked on 8 November 2026.
- Per-request cap
- not stated.
- Named modes
- not stated.
Sample 11: Undetectable AI
Undetectable AI's homepage offers sample text from ChatGPT, Claude and Gemini in its input box, read on 9 November 2026; its trial is 250 words in total and its entry plan is 10,000 words a month at $5.00 a month billed $60.00 yearly, with no request cap and no modes named on the pricing page, checked on 8 November 2026.
- Names Claude
- yes.
- Best for
- short texts on a small yearly budget.
- Main limitation
- no mode control and no stated request cap.
- Free tier
- 250 words in total.
- Cheapest plan
- 10,000 words a month, $5.00 a month billed $60.00 yearly, checked on 8 November 2026.
- Per-request cap
- not stated.
- Named modes
- none named.
Sample 12: Grammarly AI Humanizer
Grammarly's humanizer page says it turns AI-generated text from ChatGPT, Claude and Google Gemini into natural writing and describes the humanizer as free to use with basic humanization, read on 9 November 2026; Pro is $12 with the billing period not stated on the card and its limits are priced in AI prompts, not words, checked on 8 November 2026.
- Names Claude
- yes.
- Best for
- people already paying for Grammarly.
- Main limitation
- Pro is priced in AI prompts, so no humanizer word allowance can be stated.
- Free tier
- free plan; humanizer described as free to use, basic humanization.
- Cheapest plan
- Pro, $12, billing period not stated on the card, checked on 8 November 2026.
- Per-request cap
- not stated.
- Named modes
- 4 preset voices, names not stated.
Sample 13: blader/humanizer, the open-source Claude skill
blader/humanizer is an agent skill published on GitHub under the MIT licence that rewrites text against 26 named patterns taken from Wikipedia's "Signs of AI writing" page, adds no facts, and installs into Claude Code, Codex and other agents; its README states that getting past AI detectors is not a goal and that detectors still flag most of its output (blader/humanizer README, read 9 November 2026). Claude's developer documentation describes a skill as packaged instructions and metadata that the model loads when a task matches (Agent Skills overview, Claude platform documentation, read 9 November 2026). Because the skill runs on whatever Claude model your agent uses, its output is a new Claude generation and, on a supported model, is marked. Installation routes and the full pattern list are in the Claude humanizer skill guide.
Students should check their institution's AI policy before using any of these. A humanizer does not make undisclosed AI use acceptable, and this site does not help anyone misrepresent authorship. The ChatGPT version of this page, with the same tools and OpenAI's statements in place of Anthropic's, is the ChatGPT humanizer page.
- Names Claude
- runs inside Claude.
- Best for
- people who already work in an agent and want rules they can read and edit.
- Main limitation
- its README says detectors still flag most of its output, and the output is marked as Claude text.
- Free tier
- free, MIT licence.
- Cheapest plan
- none; the cost is the Claude or Codex plan you already run it in.
- Per-request cap
- your agent's context window.
- Named modes
- none; a 26-pattern rule list with an optional voice sample.
Why do Claude humanizer lists disagree with each other?
Because most of them paste one Claude answer into one detector on one day and report the number, and because none of them can read the mark Anthropic says is there. A classifier reading moves with the detector's model, the length of the sample and the day; Anthropic's help article says it is still adding marks to older models, so what a Claude answer carries also depends on which model wrote it and when. This page lists stated features and limits, which change only when a vendor edits a page, and the corrections log records each change. When the first run publishes, the Claude subset column will carry the run date, each detector's own label and the baseline reading for every input.
Questions about AI humanizers for claude output
Does Claude put a watermark in its text?
Yes: Anthropic states that supported Claude models weave an imperceptible watermark into generated text at the model level, so it is present in every Claude product and on cloud partners, with a model list in its help article read on 9 November 2026 and the method described in an explainer published on 14 August 2026.
Can a humanizer remove the Claude watermark?
Anthropic's own explainer says light editing probably will not remove it completely and a complete rewrite where every word is replaced will, read on 9 November 2026; no humanizer vendor can show you the result, because Anthropic's detector is in private preview for eligible organisations.
Which humanizers say they accept Claude text?
Eleven of the twelve hosted tools on this page name Claude on their own product pages, read on 9 November 2026: Phrasly, HIX Bypass, StealthGPT, GPTHuman, Walter Writes AI, WriteHuman, QuillBot, BypassGPT, Verva, Undetectable AI and Grammarly; Clever AI Humanizer's page did not render that day.
What is the Claude humanizer skill?
An open-source agent skill, blader/humanizer on GitHub under the MIT licence, that rewrites text against 26 named patterns from Wikipedia's Signs of AI writing page inside Claude Code, Codex and other agents; its README states that detectors still flag most of its output, read on 9 November 2026.
Is the Claude humanizer skill better than a paid humanizer?
They are built for different things: the skill is a readable rule list with no request cap beyond your agent's context window and no price, and its README says detector readings are not its goal; hosted tools sell modes and caps and describe their output in detector terms, and neither has a published figure for meaning kept yet.
How long is a typical Claude answer, and which caps fit it?
This site's method uses 350 to 500 words for its essay paragraph inputs; an answer of that length fits Phrasly, Clever AI Humanizer, HIX Bypass, StealthGPT, GPTHuman, Walter Writes AI and WriteHuman Basic in one request, and QuillBot free at 125 words per input in four, all caps checked on 8 November 2026.
Does a Claude watermark prove I used Claude?
Anthropic says a watermark can only show that Claude was likely involved at some point and cannot distinguish writing from heavy editing, carries no information about the user, and that a missing watermark does not prove a person wrote the text, read on 9 November 2026.
When will this page show detector results for Claude text?
When the first run publishes: the method scans every output on five detectors with a dated screenshot and a baseline reading, and the Claude subset column will be added to this table then.
Sources
- Claude Help Center, How Claude marks AI-generated content, read 9 November 2026: Watermark at the model level; covered models and surfaces; worldwide; detection in private preview
- Anthropic, How Claude's text watermark works, published 14 August 2026, read 9 November 2026: SynthID-Text method; light edits and full rewrites; proofreading; short passages; what a mark proves
- Google DeepMind, SynthID, read 9 November 2026: SynthID Text adjusts candidate-word probabilities
- Kirchenbauer et al. 2023, arXiv 2301.10226, read 9 November 2026: Green-token mechanism; detection from a span of tokens without model access
- blader/humanizer README, read 9 November 2026: 26 patterns; MIT licence; detectors not a goal; still flagged
- Agent Skills overview, Claude platform documentation, read 9 November 2026: What a skill is and how it loads
- Vendor pricing and product pages, checked 8 and 9 November 2026: Plans, request caps, modes and which pages name Claude, for all twelve hosted tools
Revision log
| Page published. |
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