Anthropic Updates Prospectus: Claude Has Taken Over More Than 90% of Internal Code

Anthropic Makes a Sudden Update! AI Self-Improvement Has Crossed the Red Line, and Humanity Has No Time to React Xin Zhiyuan November 03, 2026 06:18:08 From Beijing Updated November 03, 2026 06:47:26

Just moments ago, Anthropic, which is sprinting toward a Nasdaq IPO, submitted an updated prospectus (S-1/A) to the U.S. SEC.

Only a week after the first version of the prospectus was made public, Anthropic's management worked overnight to add a "confession" to the filing that makes one's heart tighten—

The red line for AI self-acceleration is close at hand. Internal estimates show that future Claude models will soon trigger the "AI significantly accelerates R&D" threshold, completing a full two years' worth of R&D progress in just one year!

Even the people building AI are looking in the rearview mirror. Hampered by "lagging indicators," Anthropic admitted for the first time that it has in the past failed to detect R&D acceleration in time, and may in the future only realize it after the acceleration has already occurred!

Fully automated AI-building is explicitly prohibited. Even though more than 90% of internal code has already been taken over by Claude, the company still draws a bottom line on page 188: it will never depart from human oversight to let Claude fully automatically design the next generation of frontier models!

Six Words Rewrite the Prospectus

Comparing the two versions of the prospectus line by line, the most critical change is on page 29.

In the first S-1 a week ago, Anthropic still left room in its wording, saying only that the company "may be unable" to identify significant acceleration in R&D before it occurs.

In this revised version, legal and management specifically inserted six English words into that sentence: "have in the past not identified."

In just six words, a warning that "it may happen in the future" was turned directly into a confession that "it has already happened in the past."

In Anthropic's own labs, the situation in which AI R&D suddenly speeds up while the human team only reacts after the fact has already truly occurred!

According to internal estimates, future models will soon hit the "self-acceleration red line" in the Responsible Scaling Policy.

Under the definition of this red line, once it is crossed, it means that with AI assistance, a full two years' worth of R&D progress at the 2018-2024 baseline pace can be completed in just one year.

The reason even top researchers who personally write algorithms and monitor data are "late to realize" is that it is very difficult to measure improvements in large model capabilities in real time.

How much stronger a new model has actually become in pretraining and agent collaboration cannot be read from the training curves alone.

Researchers must wait until the model finishes training, completes evaluations, and is then brought into internal engineering workflows for several months of practical use, and finally tally code output and experiment cycles, before they can back-calculate the true acceleration multiple.

But that is exactly where the time lag lies.

By the time researchers use months of lagging data to calculate that "it has already crossed the line," the new model has long since been writing the core code for the next-generation model day and night without pause.

Internal Token Bill Surpasses Total Employee Salaries

Yet It Dares Not Let Claude Fully Automatically Build the Next Generation

The reason observation cannot keep up is that Claude has taken over Anthropic's internal R&D far too quickly.

The updated prospectus disclosed a set of the latest third-quarter internal data. By September of this year, more than 90% of the code in Anthropic's internal codebase had come from Claude.

Driven by AI, the amount of code submitted per engineer per day soared in just one quarter from 35 times to more than 45 times the 2024 average.

Internal compute consumption has grown even more sharply. From January to September of this year, the company's internal spending on calling Claude, calculated at public list prices, surged by more than 250 times.

As early as April of this year, Anthropic's monthly spending on internal Claude had already exceeded the total monthly cash salaries paid to all employees (excluding equity incentives).

Logically, since Claude writes code dozens of times faster than humans and even its bill has surpassed human salaries, the most natural move would be to fully let go and have Claude autonomously design and train the next generation of Claude.

Yet at precisely this moment, Anthropic itself has drawn a red line!

At the end of the chapter on the internal R&D loop on page 188, Anthropic specifically added a hard rule: even if it becomes technically entirely feasible in the future, the company will not depart from human oversight and understanding to let Claude fully automatically design and build the next generation of frontier models.

The concern behind this is that as models take over more and more R&D work, if some generation of model harbors vulnerabilities, biases, or deceptive tendencies that humans have not discovered, the risk will be passed down through the R&D process.

Once authority is delegated for it to fully automatically design the next generation, these hidden dangers will accumulate across generations and amplify layer by layer, and by the time humans notice the problem, it will long since have become very difficult to trace the source.

To prevent this kind of cross-generational loss of control, Anthropic revealed on page 31 that it is considering revising its safety red lines to mandate that specific key decisions in the R&D process must be reviewed and signed off by humans.

But holding the safety boundary has also made Anthropic pay a considerable price in R&D progress.

A few weeks ago, Dario himself revealed that "an advanced Mythos-class model that had already finished training was kept under wraps for about four months."

Recently, in order to prevent model weights from being stolen and to strengthen security measures, the company delayed the start of pretraining for a brand-new frontier base model by more than a month.

For example, Mythos, the model with extremely strong vulnerability-discovery capabilities from April this year, has so far only been provided in a targeted way to a small number of institutions for defense through the "Project Glasswing" program.

Signing 895.4 Billion in Long-Term Compute Contracts

Whoever Slows Down Is Out

On one hand, it delayed pretraining of a new model by more than a month due to safety concerns; on the other hand, Anthropic's spending to grab compute is larger than anyone else's.

As a result, it has signed up almost every core compute supplier in Silicon Valley.

At the front of the line are Broadcom's $161.2 billion equipment lease and Google Cloud's $121.3 billion TPU compute (plus an additional framework of up to $150 billion).

Close behind are $120.5 billion from Musk's SpaceX and xAI (Colossus cluster), $110 billion from Amazon AWS, and after that Microsoft Azure, Nscale, Lambda, and AMD.

Comparing this with the latest financial reports of major U.S. tech giants shows just how exaggerated this bet is.

A startup with $33.2 billion in revenue in the first three quarters already carries total off-balance-sheet commitments that exceed those of Meta ($866 billion), Microsoft ($594 billion), Nvidia ($530 billion), and Amazon ($453 billion), ranking second in the entire United States only to Google!

With nearly $900 billion in compute contracts on the books, it means Anthropic no longer has any way out to slow the pace of R&D.

And to digest this enormous amount of compute and support annualized revenue of nearly $70 billion, Anthropic's only option is to hand more and more R&D work to Claude, letting it write code and run experiments at dozens of times the speed of humans!