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CalypsoAI Moderator Review

CalypsoAI Moderator filters large language model (LLM) responses for hallucinations, policy violations, and regulated data before user delivery.

shipped Nov 20, 2025analyzepaid
AnalyzeMonitoring & EvaluationHallucination & PII Detection
CalypsoAI Moderator — product screenshot

Why it matters

1Acquired by F5 for $180 million in September 2025, integrating into F5 AI Guardrails.
2Raised $23 million in June 2023, bringing total funding to $38.2 million.
3Holds 4.3% mindshare in the Generative AI Security category as of June 2026.
4Provides real-time, inline protection for LLM traffic via a model-agnostic API.

Specs

API Available

Yes, public API

overview

What is CalypsoAI Moderator?

CalypsoAI Moderator is a specialized AI security tool developed by CalypsoAI that enables enterprises to ensure safe and compliant use of generative AI. It operates as a security-first orchestration layer that inspects and enforces policies on all LLM traffic in real-time. Its primary function involves scanning both incoming prompts to LLMs and outgoing responses from them, aiming to prevent a range of risks associated with generative AI usage. This real-time inspection capability is crucial for organizations, particularly those in highly regulated sectors, to adopt generative AI while adhering to strict regulatory and confidentiality requirements.

features

Key Features of CalypsoAI Moderator

CalypsoAI Moderator provides a comprehensive suite of features designed to secure enterprise interactions with large language models, operating as a critical 'trust layer' for generative AI deployments. These capabilities are integrated into the broader CalypsoAI Platform and now F5 AI Guardrails.

  • Data Loss Prevention (DLP): Scans for and blocks sensitive data, including Personally Identifiable Information (PII), source code, and copyrighted text, in prompts and responses.
  • Prompt Injection Prevention: Detects and mitigates attempts to bypass LLM safeguards or manipulate model behavior.
  • Malicious Code Detection: Identifies and blocks malicious code embedded in both user prompts and LLM-generated responses.
  • Content Moderation: Filters out hallucinations, bias, and intellectual property (IP) issues from LLM outputs before delivery.
  • Policy Enforcement: Allows organizations to define and enforce their own generative AI governance policies across all LLM interactions.
  • Auditability and Observability: Maintains a complete history of prompt inputs and responses for reporting, auditing, and visibility into LLM usage, costs, and content.
  • Real-time, Inline Protection: Operates as a runtime proxy, inspecting every request and response before it reaches an LLM or the end-user.
  • Customizable Scanners: Enables organizations to build tailored security scanners to adapt AI defenses to specific operational needs and compliance requirements.
  • API Availability: Offers a robust API for seamless integration with existing enterprise applications and any major LLM provider.

use cases

Who Should Use CalypsoAI Moderator?

CalypsoAI Moderator is primarily designed for enterprises, particularly those operating in highly regulated industries, that require stringent security and compliance measures for their generative AI deployments. Its capabilities address critical risks associated with LLM adoption.

  • Enterprises in regulated sectors (e.g., financial services, healthcare, government agencies) needing to ensure strict regulatory and confidentiality adherence for generative AI.
  • Organizations deploying Agentic AI applications that require secure and compliant interactions to prevent data exfiltration and policy violations.
  • Companies aiming to reduce data exfiltration risks and protect sensitive information when interacting with large language models.
  • Teams seeking to accelerate compliance reviews and establish robust generative AI governance policies.
  • Users requiring enhanced accuracy, trust, and safety in LLM responses by mitigating hallucinations and bias.

how to use

How to Use CalypsoAI Moderator

CalypsoAI Moderator integrates as an API-based security layer between enterprise applications and large language models, inspecting traffic in real-time to enforce policies and mitigate risks.

  • 1Integrate CalypsoAI Moderator via its API with existing LLM providers such as OpenAI, Anthropic, or Google, or with custom LLM deployments.
  • 2Define and configure organizational generative AI governance policies within the CalypsoAI platform to specify acceptable content, data handling, and security parameters.
  • 3Deploy custom security scanners to tailor AI defenses for specific use cases, sensitive data types, or industry regulations.
  • 4Monitor LLM prompts and responses in real-time for data loss prevention (DLP), prompt injections, malicious code, and policy violations.
  • 5Utilize audit logs and visibility dashboards to gain insights into LLM usage, costs, and content, facilitating compliance reporting and operational analysis.
  • 6Leverage the platform to secure agentic AI applications and AI inference projects, ensuring safe and compliant operation across the enterprise.

pricing

CalypsoAI Moderator Pricing & Plans

CalypsoAI Moderator operates on a paid subscription model. Specific pricing tiers and detailed cost structures are not publicly disclosed and typically involve enterprise-level agreements based on usage, features, and organizational scale. Interested organizations are advised to contact CalypsoAI (now F5) directly for a customized quote.

Pros

  • +Provides real-time, inline security for LLM prompts and responses, acting as a critical trust layer.
  • +Features a model-agnostic architecture, supporting multi-model environments and reducing vendor lock-in.
  • +Offers comprehensive Data Loss Prevention (DLP) and prompt injection mitigation capabilities.
  • +Enables robust policy enforcement and customizable security scanners for tailored AI defenses.
  • +Enhances auditability and observability for compliance reporting and detailed LLM usage analysis.
  • +Its acquisition by F5 in September 2025 integrates its technology into a broader enterprise security platform (F5 AI Guardrails).

Cons

  • −Specific pricing details are not publicly disclosed, indicating a focus on enterprise-level contracts.
  • −Some users have noted that model evaluation could be faster when utilizing its Red-Team platform.
  • −Implementation costs can be a potential drawback for organizations due to its enterprise focus.
  • −Mindshare in the Generative AI Security category decreased from 6.0% to 4.3% between 2025 and 2026.
  • −Requires API integration, which may necessitate development effort for full deployment within existing systems.

Similar Tools

CalypsoAI Moderator vs Competitors

CalypsoAI Moderator positions itself as a leader in AI security, providing a comprehensive platform to protect AI models, applications, and agents at the inference layer. Its model-agnostic architecture and real-time inline protection are key differentiators in the competitive landscape.

1
Lakera GuardOn StorkCompare

Provides real-time AI security for LLM applications, focusing on prompt injection, jailbreaks, data leakage, and content moderation, with high detection rates and low latency.

Similar to CalypsoAI Moderator, Lakera Guard offers real-time filtering for data leakage, content moderation, and hallucination detection, with a focus on developer-first integration and a free tier for initial use, unlike CalypsoAI Moderator which is listed as paid.

2
Arthur AI (Arthur Shield)On StorkCompare

Offers an LLM firewall (Arthur Shield) that provides real-time detection of PII leakage, hallucinations, prompt injection, and toxic language, as part of a broader AI monitoring and governance platform.

Arthur Shield directly competes with CalypsoAI Moderator by providing an LLM firewall for real-time detection of PII, hallucinations, and policy violations, but it is part of a more comprehensive AI observability and governance platform that also includes open-source evaluation tools.

3
Protect AI (LLM Guard)On StorkCompare

An open-source security toolkit for LLM interactions that detects, redacts, and sanitizes prompts and responses for safety, security, and compliance, with a commercial version offering expanded features.

LLM Guard offers similar prompt and response filtering for data leakage, harmful language, and prompt injection as CalypsoAI Moderator, but distinguishes itself with an open-source core, allowing for community-driven innovation and transparency, with a commercial version for enterprise needs.

4
WhyLabs LLM SecurityOn StorkCompare

Provides comprehensive monitoring and safeguarding mechanisms for deployed LLM systems, focusing on data leakage protection, prompt injection monitoring, and misinformation prevention due to hallucinations.

WhyLabs LLM Security offers robust monitoring and safeguarding against data leakage, prompt injection, and hallucinations, directly aligning with CalypsoAI Moderator's features, but with a stronger emphasis on continuous observability and evaluation of LLM behavior in production environments.

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