Anthropic introduced Bloom, an open-source tool designed to automate behavioral safety evaluations for frontier models.
Bloom takes a target behavior (e.g., dishonesty, self-interest, bias) and generates diverse test scenarios, measuring both frequency and severity of that behavior in model responses. Anthropic claims Bloom evaluations correlate strongly with hand-labeled judgments and reliably differentiate baseline models from intentionally misaligned ones.
This is significant because safety evaluation has become a bottleneck: models evolve faster than manual testing can keep up. Bloom’s approach provides repeatable, scalable behavioral auditing that could become a standard layer in safety and governance workflows.
