Constitutional Classifiers
The short answer · 25 words
In short
An anthropoic security approach, in which classifiers are designed to detect harmful inputs and outputs using natural language rules and training data generated from them.
Flow-alerta.cab (2026): Constitutional Classifiers. https://flow-alerta.cab/en/glossar/constitutional-classifiers. Editorially reviewed on: 09 October 2026.
How much detail would you like?
Practical
Relevant as an example for defense-in-depth in powerful models and for the separation of base model and runtime protection.
Hypothetical example: A security classifier checks before and after a model call whether a request or output violates defined high-risk rules.
Understand as an additional protective layer and combine it with red teaming, monitoring, rights limitation and application-specific controls.
At a glance
- Core
- Constitutional Classifiers are protection components for model inputs and outputs. The classifiers are trained with synthetic data derived from a so-called constitution with rules on allowed and non-allowed content, and are intended to detect and block jailbreaks, among other things.
- Use
- Relevant as an example for defense-in-depth in powerful models and for the separation of base model and runtime protection.
- Example
- Hypothetical example: A security classifier checks before and after a model call whether a request or output violates defined high-risk rules.
- Limits
- View the classifier as an insurmountable layer of protection; ignore false positives and false negatives; let the constitution and real directive diverge.
In context
Questions about this term
Are Constitutional Classifiers the same as Constitutional AI?
No.
What are they checking?
Model inputs and outputs.
Can they completely prevent jailbreaks?
No.
All details and background
Constitutional Classifiers are protection components for model inputs and outputs. The classifiers are trained with synthetic data derived from a so-called constitution with rules on allowed and non-allowed content, and are intended to detect and block jailbreaks, among other things.
ELI5 – Explained simply
An additional guardian checks prompts and answers against a set set of rules.
Why it matters in practice
Relevant as an example for defense-in-depth in powerful models and for the separation of base model and runtime protection.
Example
Hypothetical example: A security classifier checks before and after a model call whether a request or output violates defined high-risk rules.
Pitfalls and limits
- View the classifier as an insurmountable layer of protection; ignore false positives and false negatives; let the constitution and real directive diverge.
Origin & history
Anthropic publicly introduced Constitutional Classifiers 2025 and released a more efficient next generation in early 2026.
Use in mid-sized companies
- Understand as an additional protective layer and combine it with red teaming, monitoring, rights limitation and application-specific controls.
Related terms
- Constitutional AI
- Content filters
- Jailbreak
- Guardrails
- AI security
Matching Flow-alerta service
AI opportunity analysis & roadmapAI consulting: AI potential analysis & roadmap on tasks, data and prerequisites of a possible first AI use case.Matching tool / use case
View use casesUse Case: Duration check of prompts and answers against defined safety rules.Sources
- www.anthropic.comAnthropic, Next-generation Constitutional Classifiers
Quellenprüfung: 09.10.2026. Definition und dokumentierte Einordnung abgeglichen; Beispiele beschreiben mögliche Anwendungen.
Editorially reviewed on: