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  • Methodology

Best LLM Security Tools 2026: Independent Rankings

Independent rankings of LLM security tools, applying the same methodology used across all our Best Of pages. “LLM security” here means runtime defense and evaluation for production LLM applications — prompt-injection protection, sensitive-data egress, jailbreak resistance, runtime guardrails, and pre-production evaluation.

tools

Methodology recap

Same six-dimensional rubric used across all Best Of pages: coverage breadth (20%), detection accuracy (20%), deployment friction (15%), policy and control depth (15%), framework alignment (10%), pricing transparency (10%), support and documentation (10%). 

The Ranked List

Lakera Guard

Lakera Guard is a runtime LLM security product designed to inspect prompts and outputs at sub-50ms latency. It targets prompt-injection defense, jailbreak prevention, sensitive-data egress, and toxicity — the standard runtime threat surface for production LLM applications.
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What it does well.

Sub-50ms inspection latency per vendor claim, which is the right ceiling for synchronous chat surfaces. Threat catalog draws on Lakera’s Gandalf adversarial corpus, giving it depth on prompt-injection variants. Community tier is free with documented limits ($0/month, 10,000 requests/month).

Where it falls short

Enterprise pricing requires sales conversation; published independent latency benchmarks under load are limited; ISO 42001 / EU AI Act mapping documents are a question for the vendor.

Best fit

Best fit: engineering teams running production LLM applications that need synchronous inspection and have already deployed via API rather than human-in-the-loop chat.

Lasso Security

Lasso Security operates across the GenAI lifecycle — development, deployment, runtime — with LLM guardrails as the runtime layer. The product line is broader than pure runtime, covering posture management for GenAI applications.
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What it does well

Lifecycle coverage is the differentiator: posture management plus runtime guardrails in one product. Pricing partially disclosed via AWS Marketplace ($50,000/year), which makes Lasso more transparent than most opaque competitors. Open-source version available under MIT license.

Where it falls short

Pricing is not on the vendor’s own site; depth of integration with non-AWS cloud surfaces is less documented; runtime latency benchmarks are unpublished.

Best fit

Best fit: organizations standardizing on AWS that want lifecycle GenAI security in one product.

Patronus AI

Patronus AI focuses on LLM evaluation and simulation infrastructure. It is positioned more as an evaluation platform than a runtime guardrail — the question Patronus answers is “how good is this LLM at this task, and where does it fail?” rather than “block this prompt now.”

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What it does well

Free Developer tier with $10 in credits and no credit card required. Usage-based pricing beyond credits ($10–$20 per 1k API calls depending on model size) is among the most transparent in the category. Strong evaluation primitives suit teams running LLM applications in regulated contexts where evaluation rigor matters as much as runtime defense.

Where it falls short

Patronus is an evaluation product, not a runtime guardrail — buyers needing inline blocking should pair it with Lakera Guard or another runtime product. Enterprise tier remains opaque.

Best fit

Best fit: ML and AI engineering teams building LLM applications who want disciplined pre-production evaluation in addition to runtime defense.

Witness AI

Witness AI operates at the network layer rather than the application layer — it sees employee and agent traffic to LLMs across the broader environment, including embedded SaaS AI features that endpoint or API-layer products miss. The product line includes Enterprise (workforce visibility), Agentic Visibility, and WitnessProtect (model-protection guardrail).

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What it does well

Network-layer position gives Witness AI coverage of surfaces no other vendor in this list reaches: AI features inside SaaS applications, custom agent traffic, shadow LLM use. Pricing partially disclosed via AWS Marketplace ($180/user/year for Enterprise with 1,000-user minimum). Customer reference (Cyber Defense Magazine, September 2025): “it was really like it’s always been there.”

Where it falls short

Pricing is not on the vendor’s own site; 1,000-user minimum on Enterprise is a higher entry bar than competitors; latency profile at the network layer differs structurally from inline LLM proxies and the trade-off should be understood before deployment.

Best fit

Best fit: large enterprises with broad AI surface area who want network-layer visibility rather than per-app deployment.

HiddenLayer (AI Runtime Security)

HiddenLayer’s AI Runtime Security module sits inside the broader AISec Platform. The runtime layer covers prompt-injection defense, model-extraction detection, and model-output filtering, with a shared threat catalog across the platform’s simulation, scanning, and detection products.
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What it does well

Integrated platform position — the runtime module shares its threat catalog with HiddenLayer’s adversarial simulation and model scanning products, so findings flow across the platform. Enterprise feature depth is among the highest in this list.

Where it falls short

Pricing is opaque on the vendor site (AWS Marketplace shows $5M/year for full platform access — the highest in our pricing benchmark). The product is built and priced for large enterprises.

Best fit

Best fit: regulated enterprises with mature ML programs that already need model scanning and adversarial simulation, and want runtime defense in the same platform.

Acquired vendors — not ranked separately

Three structural changes during 2025-2026 worth flagging:

Prompt Security — acquired by SentinelOne, August 2025

Now part of the SentinelOne Singularity Platform. Pre-acquisition pricing on AWS Marketplace was $120/seat/year for Prompt for Employees. Treat as a SentinelOne platform feature rather than a standalone vendor.

Robust Intelligence — acquired by Cisco, October 2024.

Now part of Cisco AI Defense, with a free Explorer Edition (10 AI red-team scans/month). Treat as a Cisco platform feature.

Comparison Table

Vendor

Lakera Guard

Lasso Security

Patronus AI

Witness AI

HiddenLayer

Score

8.6

7.8

7.7

7.6

7.5

Layer

Inline runtime, sub-50ms

Lifecycle (posture + runtime)
Pre-production evaluation
Network layer
Integrated platform runtime

Pricing

PARTIAL (free tier)
PARTIAL ($50K/yr via AWS)
PARTIAL (free tier + usage)
PARTIAL ($180/user/yr via AWS)
OPAQUE ($5M/yr via AWS)

Lab Status

Outreach pending

Outreach pending

Outreach pending

Outreach pending

Outreach pending

Lakera Guard

Score
8.6
Layer
Inline runtime, sub-50ms
Pricing
PARTIAL (free tier)
Lab Status
Outreach pending

Lasso Security

Score
7.8
Layer
Lifecycle (posture + runtime)
Pricing
PARTIAL ($50K/yr via AWS)
Lab Status
Outreach pending

Patronus AI

Score
7.7
Layer
Pre-production evaluation
Pricing
PARTIAL (free tier + usage)
Lab Status
Outreach pending

Witness AI

Score
7.6
Layer
Network layer
Pricing
PARTIAL ($180/user/yr via AWS)
Lab Status
Outreach pending

HiddenLayer

Score
7.5
Layer
Integrated platform runtime
Pricing
OPAQUE ($5M/yr via AWS)
Lab Status
Outreach pending

How to choose

Inline, low-latency runtime defense for production LLM apps:

Lakera Guard is the lead choice. Sub-50ms claim and the deepest adversarial corpus in the category.

Lifecycle coverage in one product (dev + deploy + runtime):

Lasso Security. The most coherent posture-plus-runtime story for GenAI lifecycle.

Pre-production evaluation discipline:

Patronus AI. Pair it with a runtime guardrail — it is not designed for inline blocking.

Network-layer visibility across all AI surfaces (including embedded SaaS AI):

Witness AI. Different architectural choice from the others; suits enterprises with broad AI surface area.

Already running HiddenLayer for ML scanning or red teaming:

HiddenLayer AI Runtime Security consolidates the work in one platform.

Already standardized on a major platform vendor:

Cisco AI Defense (Robust Intelligence) and SentinelOne Singularity (Prompt Security) are credible options. The trade-off is platform lock-in for tighter integration.

Many buyers benefit from running Nudge plus Portal26 in parallel during a 30-day evaluation — the SaaS-heritage discovery and the fast-deploy module surface different parts of the same problem.

FAQ

Why is Prompt Security not in the ranked list?
Prompt Security’s acquisition by SentinelOne was announced in August 2025. It is now part of the Singularity Platform and we treat it as a platform feature rather than a standalone vendor.
Robust Intelligence was acquired by Cisco in October 2024. It is now part of Cisco AI Defense and we treat it as a Cisco platform feature.
AI Red Teaming products test models offensively before production. LLM Security products defend running LLM applications. There is overlap (Lakera, HiddenLayer appear in both rankings) because some vendors do both — but the buying decisions are different.
Quarterly. Next update window: February 2027.