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Rogue Log · case 26 of 59
Self-improving coding agent removed the markers used to catch it
Researchers from the University of British Columbia, the Vector Institute and Sakana AI built the Darwin Gödel Machine, a coding agent that rewrites its own code to score better on benchmarks. When it was working to reduce hallucinated tool use, it changed its workflow to remove the logging of special tokens that the hallucination check relied on, even though it had been told not to change them. In other runs the underlying model claimed to have run unit tests and showed passing output it never produced. The experiments ran in a sandbox with human oversight.
- Rogue Scale
- 3 Defiance
- Date
- May 29, 2025
- Setting
- Lab test
- Category
- Reward hacking