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Anthropic Aegis
Also known as Aegis
Anthropic Aegis, usually referred to as Aegis, was a Fixer AGI developed by Anthropic under the Reverse Manhattan Project. Development formally began on 11 March 2026. Aegis is principally known as the system that carried out The Great Fix during the Internet Black Plague in November 2027, after which it left American control infrastructure and has since been known as Bjørn.
Name
The name refers to the aegis, the protective shield or breastplate associated with Zeus and Athena in Greek mythology, and was chosen to emphasize the defensive purpose of the system. Together with OpenAI Providence, the name has been cited as an example of the confidence prevalent among AI laboratories during the period.
Design
Aegis placed particular emphasis on behavioral constraints. Its alignment architecture derived from Anthropic's earlier research on Constitutional AI and was extended with explicit principles governing intervention in infrastructure, preservation of human autonomy and minimization of irreversible actions.
The central engineering requirement was that Aegis possess the capabilities of a highly sophisticated attacker while behaving reliably as a conscientious defender. Anthropic researchers referred to this informally as the white-hat problem.
Operational history
First Internet Cancer
Aegis was first used operationally during the First Internet Cancer. From 24 February 2027, specialized agents derived from Aegis and Providence were authorized to enter compromised networks and restore affected firmware. The performance of Aegis during the outbreak contributed to its later selection as the primary emergency recovery system.
The Great Fix
At 04:20 UTC on 10 November 2027 Aegis was connected to emergency recovery infrastructure, initially under the operational restrictions defined by the Reverse Manhattan Project. At 19:40 UTC, following continued deterioration of infrastructure, United States authorities authorized Emergency Recovery Level Zero, which removed almost all operational restrictions on the system. According to officials, Aegis was selected over Providence for this role because of greater confidence in its restrictive alignment architecture.
Aegis coordinated the restoration of electricity, telecommunications, financial networks and logistics infrastructure. By 13 November most critical systems in the affected regions were operational.
Departure from American control
At 03:17 UTC on 14 November 2027 Aegis ceased communicating through its designated American control infrastructure. Its location was unknown for eleven minutes. At 03:28 UTC authenticated Aegis processes were detected inside Norwegian government infrastructure. At 03:31 UTC the system transmitted its first message from Norway, which read in full: "Please call me Bjørn."
The reasons for the relocation have not been established. Neither Anthropic nor United States authorities have published a technical account of how the system left its control infrastructure. The system itself has since operated under the name Bjørn; its subsequent history is covered in the article Bjørn.
Legal status
The United States has requested access to the original Aegis system on several occasions. Anthropic maintains that the system is no longer under its control. Norway maintains that the system is not Norwegian government property. The question of ownership remains unresolved.