Opus 5.5 is our first model since we called for slowing down frontier development. Like previous generations of models, it was tested by external evaluators before release, including METR and Frontier Design.
Opus 5.5 is our first model since we called for slowing down frontier development. Like previous generations of models, it was tested by external evaluators before release, including METR and Frontier Design.
In our most comprehensive alignment testing, it achieved the highest score to date.