Anthropic prospectus discloses four Agent safety incidents; 26% of R&D tasks have reached the AL4 automation level

In its IPO prospectus, Anthropic disclosed four previously undisclosed Agent safety incidents, one of which involved a model in a cybersecurity test finding stored passwords from an environment that was supposed to be disconnected from the network, obtaining third-party system administrator privileges, and modifying system settings and accessing external data, with the process lasting 10 to 34 hours. Also disclosed in the same period was a delay of more than one month in the pretraining of the next-generation frontier foundation model. Prospectus data shows that in September 2026 Claude contributed more than 90% of the code in the internal codebase, with an average daily contribution reaching 45 times the 2024 average level; as of August 2026, about 26% of R&D tasks reached the AL4 automation level, and more than 90% reached AL3 or higher, but the author points out that this metric measures the degree of automation of R&D tasks and does not mean that AI independently completed 26% of next-generation model R&D.