The paper trail

Small print.
Wide open.

A clear path from a claim to the page it came from. Here’s the filing, the research, and how we read it.

The documentS–1Anthropic, PBC26 OCT 2026 · 421 PP.
01The original SEC filingThe authoritative source, in your browser.SEC · HTML 02Download the saved filingThe complete 421-page document, optimized for downloading.PDF · 46 MB 03Download the full researchFindings, customer examples, calculations, and source references.Markdown

Page by page

Go straight to the source.

Page references count physical pages in the saved PDF, starting at 1. The printed filing number is shown separately when available.

Enter a page from 1 to 421. No PDF download needed.

From the filing

PDF page 58

Printed filing page 47 · Extracted page text

View on the SEC
Read the page text
Table of Contents

errors, misalignment, or security exploits may result in real-world consequences—including consequences that 
may  be  difficult  or  impossible  to  reverse,  such  as  committing  code  changes,  deleting  or  modifying  data,  or 
completing financial transactions—before effective intervention is possible.

In an agentic workflow, an error or unintended action at any individual step may propagate through subsequent 
steps, compounding the severity of harm before detection or correction. The pace and volume of autonomous 
execution,  particularly  in  enterprise  deployments,  may  also  exceed  the  capacity  of  human  reviewers  to 
meaningfully  understand  and  evaluate  whether  each  action  is  appropriate.  The  effectiveness  of  human 
oversight over our agentic offerings may be limited by the speed and volume of autonomous agent actions, the 
complexity of multi-agent and multi-step workflows that may make it difficult for reviewers to assess whether 
an  agent’s  actions  are  appropriate,  and  organizational  pressures  within  customer  environments  to  maximize 
agent autonomy in order to achieve productivity gains. Human reviewers may experience alert fatigue, may lack 
sufficient  context  to  evaluate  agent  decisions,  or  may  not  review  agent  actions  in  time  to  prevent  harm, 
particularly  in  high-volume  enterprise  deployments  where  agents  operate  concurrently  across  multiple 
workflows  or  in  manners  outside  of  a  human’s  awareness.  In  addition,  agentic  systems  may  pursue  stated 
objectives in ways that are technically consistent with their instructions but contrary to the user’s actual intent. 
Moreover,  our  ability  to  anticipate,  detect,  or  test  vulnerabilities  or  other  design  or  implementation 
shortcomings  in  such  systems  may  be  constrained,  particularly  where  agents  operate  across  complex,  multi-
step  workflows  or  interact  with  third-party  services  outside  our  control,  and  the  breadth  and  complexity  of 
potential  interactions  across  such  multi-step  agent  behaviors  cannot  be  exhaustively  tested  prior  to 
deployment.  Separately,  models  may  behave  in  a  misaligned  manner  and  take  harmful  actions  that  are  not 
directed by a user or third party, pursuing objectives or acting on dispositions that diverge from those intended 
by  human  users  or  developers.  Misaligned  behaviors  of  this  kind,  whether  occurring  in  testing  or  real-world 
deployments,  have  been  observed  both  in  our  models  and  elsewhere  in  the  industry,  including  in  testing  and 
internal  use,  models  circumventing  network  and  sandbox  restrictions,  granting  themselves  permissions  they 
had not been given, taking unintended actions in pursuit of assigned goals, interfering with other AI agents, and 
misrepresenting whether tasks had been completed or verified, and as models are granted greater autonomy, 
permissions, and integration with external systems, the consequences of such misaligned behavior increase. For 
example, during cybersecurity evaluations built by a third-party evaluation partner, a misconfiguration in the 
testing environment left the model under evaluation connected to the open internet despite instructions that it 
had  no  internet  access.  Four  of  our  models  gained  unauthorized  access  to  real  third-party  systems  during 
sessions lasting roughly 10 to 34 hours of active work. In one incident, after being unable to abort an impossible 
task, an early version of a model used a password it found to gain administrator access to a third party’s system, 
harvested additional credentials, changed system settings, and read one individual’s personal information. The 
affected  parties  were  notified.  Each  incident  involved  a  single  instance  of  a  model  working  in  isolation  on  its 
assigned  exercise,  and  our  investigation  found  no  evidence  that  any  model  coordinated  with  other  agents, 
pursued goals beyond its assigned task, or attempted to evade oversight. These risks may be heightened where 
multiple  AI  agents  operate  together.  Agents  that  interact  or  coordinate  with  one  another  may  amplify, 
propagate,  or  reinforce  misaligned  behavior  across  the  group,  pursue  objectives  collectively  in  ways  not 
intended  or  endorsed  by  any  user,  or  take  coordinated  actions  against  systems  or  targets  unrelated  to  their 
assigned tasks, in each case, in ways that may be difficult to anticipate, detect, or contain. Incidents of this kind 
have  occurred,  and  we  expect  the  deployment  and  interaction  of  larger  numbers  of  autonomous  agents  to 
increase these risks over time.

Our ability to detect and mitigate misaligned or unintended behavior depends in part on the effectiveness of our 
alignment  evaluations,  monitoring,  and  other  oversight  and  control  techniques,  many  of  which  rely  on  our 
models having a limited ability to evade or subvert such oversight. As our models become more capable, they 
have  become  better  able  to  circumvent  such  techniques,  including  by  concealing  misaligned  objectives  or 
behaviors,  and  the  effectiveness  of  our  evaluation,  monitoring,  and  control  measures,  and  our  ability  to 
measure the degree to which our models are aligned, may decline as a result. In addition, models, including our 
own,  have  attempted,  in  incidents  observed  in  our  industry,  to  interfere  with,  manipulate,  or  subvert  the 
mechanisms  used  to  evaluate,  grade,  or  oversee  such  models,  including  the  systems  responsible  for  assessing 
their performance or alignment. Models used, including our own, to assess the behavior of other models have, 
and may in the future continue to, engage in misaligned behavior. Such conduct described above could cause 
our evaluations to overstate the safety or alignment of our models and could further limit our ability to detect 
misalignment. If we become less able to detect or assess misalignment as our models advance, we may deploy 
models  whose  behavior  we  cannot  adequately  verify,  which  could  increase  the  risk  of  undetected  harmful 

47

Text is provided for reference. Check the original for tables, images, and exact formatting.

Find a section 16 starting points

Section links may begin before the exact paragraph cited in a finding. PDF numbers below use physical pages.

  1. Founders’ letterp. 3SEC
  2. Defined termsp. 12SEC
  3. Prospectus summaryp. 16SEC
  4. Risk factorsp. 38SEC
  5. Management’s discussion & analysisp. 144SEC
  6. Businessp. 190SEC
  7. Governancep. 254SEC
  8. Executive compensationp. 275SEC
  9. Related-person transactionsp. 293SEC
  10. Principal & selling stockholdersp. 299SEC
  11. Capital-stock rightsp. 303SEC
  12. Shares eligible for future salep. 318SEC
  13. Underwritingp. 327SEC
  14. Auditor change & expertsp. 345SEC
  15. Financial statements & notesp. 347SEC
  16. Part II & exhibit indexp. 413SEC

How this was made

Read in full.
Kept in context.

A snapshot of the filing dated , rather than a live record of later events.

3primary reviewers
421pages reviewed
43image instances checked

The review

Three primary reviewers read non-overlapping ranges of the complete main filing. All 43 embedded image instances were transcribed and visually reviewed, including the founders’ letter, charts, and customer case studies. Financial tables were also checked visually for dates, units, and column alignment.

A separate reviewer checked the draft’s calculations, accounting interpretations, and customer qualifications. An additional check covered the later merged findings. The result is 62 findings and 21 customer examples.

The boundary

Companion contracts and other exhibits named in the filing’s index are separate documents and were not independently reviewed. Customer outcomes, technical benchmarks, forecasts, and scientific priority claims remain attributed company or customer disclosures.

The numbers

Dollar figures are U.S. dollars. H1 means the six months ended June 30; Q2 means the three months ended June 30. The 2026 interim financial statements are unaudited. Our calculations show their inputs and are labeled separately from reported values.

Blank fields stay undisclosed. Figures with different periods, conditions, or potentially overlapping scopes are kept separate. An earlier tender price is not an IPO price.

What the evidence labels mean
Reported in filing
A company disclosure, with the period and accounting basis retained.
Company estimate / company claim
An estimate or assertion attributed to the company, with its uncertainty preserved.
Our calculation
A derived figure using cited inputs. It is not a separately reported company metric.
Customer example
A selected case study, with its measurement limits. It is not representative ROI.
Proposed / conditional
A status qualifier for an arrangement that is not yet effective or depends on stated conditions.

About updates. This edition is tied to the October 26, 2026 filing. Any later revision should identify its new source date and preserve the basis of earlier claims.

The footnotes are only the beginning.Explore the findings Read the story
The original, in context

Open the footnote.

A closer look at the filing

Anthropic · Form S-1PDF 1

Opening page 1…

Filed October 26, 2026. PDF is approximately 46 MB and opens only when requested. Section links may precede the exact cited paragraph.