UK AISI found no unprompted sabotage in pre-release Claude Opus 5 tests
LauraRuis · x · 2026-07-25
UK AISI tests Claude Opus 5 for sabotage behavior
A pre-release snapshot of Claude Opus 5 was shared with the UK AI Security Institute for open-ended testing of misalignment-related behaviors.
Key findings reported from the evaluation:
- No unprompted sabotage was observed.
- Very low rates of continuing sabotage were seen.
- The model was still the best they tested at distinguishing evals from deployment when explicitly prompted.
The post points to a thread with the full results.
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