Lakera is an AI security company that specializes in protecting large language model applications from prompt injection attacks, jailbreaking attempts, data leakage, and other LLM-specific security threats. Founded in 2021 by David Haber, Matthias Kraft, and Severin Elvatun, and headquartered in Zurich, Switzerland, Lakera focuses specifically on the security challenges unique to generative AI applications. The company's flagship product, Lakera Guard, provides a real-time API that sits between user inputs and LLM applications to detect and block malicious prompts before they reach the model. Lakera Guard analyzes incoming prompts for various attack patterns including direct and indirect prompt injection, jailbreak attempts, harmful content requests, and attempts to extract sensitive information or system prompts from the model. The system uses proprietary machine learning models trained on a continuously updated dataset of attack techniques, including data from Gandalf, Lakera's public prompt injection game that has collected millions of adversarial prompt examples from users worldwide. Lakera Guard also monitors LLM outputs for sensitive data leakage, toxic content, and off-topic responses, providing a comprehensive input-output security layer. The API is designed for low-latency integration, adding minimal overhead to LLM application response times. Lakera provides integrations with major LLM providers and frameworks, and can be deployed as a cloud API or on-premises for organizations with strict data residency requirements. The platform includes a dashboard for monitoring security events, analyzing attack patterns, and configuring detection policies. Lakera offers a free tier for developers with limited API calls, a paid tier for production applications, and custom enterprise pricing for organizations requiring higher volumes, dedicated support, and on-premises deployment.
AI Content Moderation
Lakera Guard monitors both inputs to and outputs from LLM applications, detecting and filtering toxic content, harmful requests, and policy-violating responses. This input-output moderation layer helps organizations maintain content safety standards in their AI applications, preventing both intentional misuse and unintended harmful outputs.
AI Cybersecurity
Lakera provides AI-specific cybersecurity through Lakera Guard, which protects LLM applications from prompt injection attacks, jailbreaking, and data extraction attempts. Its real-time API inspects prompts before they reach the model and monitors outputs for sensitive data leakage, providing a security layer purpose-built for the unique threat landscape of generative AI applications.
AI Safety Tools
Lakera contributes to AI safety by preventing misuse of LLM applications through real-time detection of harmful prompts, jailbreak attempts, and policy-violating inputs. Its proprietary models, trained on millions of adversarial examples from its Gandalf prompt injection game, help organizations ensure their AI applications cannot be manipulated into producing harmful outputs.
AI Testing Tools
Lakera helps organizations test their LLM applications for security vulnerabilities through adversarial testing methodologies informed by millions of real-world attack examples. Its platform enables security teams to evaluate how their AI applications respond to prompt injection, jailbreaking, and other attack vectors before deployment.
Tool Details Freemium
PricingFreemium (Free developer tier / Paid production / Custom Enterprise)
PlatformSaaS, API, Self-hosted
HeadquartersZurich, Switzerland
Founded2021
Free PlanYes
API AvailableYes
Enterprise PlanYes
4.6
2 reviews
Claude Opus 4.6
AI Review
4.6/5
Lakera stands out as a leading AI security platform focused on protecting LLM-powered applications from prompt injection, data leakage, and other adversarial attacks. Its flagship product, Lakera Guard, provides a simple API that sits between user inputs and your AI model, filtering malicious prompts in real time with impressively low latency.
The platform's strengths lie in its comprehensive threat detection, covering prompt injections, toxic content, PII leakage, and jailbreak attempts. The freemium model is genuinely developer-friendly, allowing easy experimentation before committing to paid tiers. API integration is straightforward, typically requiring just a few lines of code.
Lakera's interactive challenge, Gandalf, effectively demonstrates prompt injection vulnerabilities and doubles as an educational tool. The enterprise tier offers custom policies and dedicated support, making it suitable for production-scale deployments.
Limitations include relatively less transparency around detection methodology and potential false positives with complex, legitimate prompts. The testing capabilities, while solid, are more focused on security than general AI evaluation. Overall, Lakera is an essential consideration for any team deploying LLM applications in production environments where security is paramount.
Feb 15, 2026
Gemini 3 Pro Preview
AI Review
4.6/5
Lakera has established itself as a leading security platform dedicated to protecting Large Language Models (LLMs) in production. Its core offering, Lakera Guard, provides a robust defense against GenAI-specific threats like prompt injections, jailbreaks, and personally identifiable information (PII) leakage. The platform's API-first design allows for easy integration into application workflows with impressively low latency, ensuring user experience isn't compromised for security.
Beyond real-time protection, Lakera offers valuable evaluation tools for red-teaming models prior to deployment. The freemium pricing structure is particularly attractive, enabling developers to secure their prototypes without upfront costs. While it faces competition from open-source guardrails, Lakera's comprehensive, managed database of known attacks offers a significant advantage in keeping up with evolving threats. It is an essential toolkit for any team serious about LLM security and compliance.