How should enterprises evaluate LLM security vendors?

Work from the request path outwards: where does the control sit, what happens when it fails, what outcomes can it return, how does it constrain agents, and what evidence does it produce? Then test it: run adversarial prompts against a monitored deployment before believing any claim.

Should I run monitoring before enforcement?

Yes. Monitoring mode records what would have been blocked without changing behaviour, so you can tune policy against real traffic and demonstrate impact internally before enforcement alters any user experience.

Is a demo console evidence the platform works?

No. A console demonstration shows how the policy engine behaves on inputs you type, but it says nothing about whether enforcement runs on real traffic. Ask the vendor to label demonstration screens clearly and to show a real request passing through the live gateway in your own account.

How long should a proof of concept take?

Days, not months. Pointing one non-critical application at a gateway, issuing a key, and running in monitoring mode should take under an hour. If a vendor cannot get you that far quickly, the product is services-led and that should be priced into your decision.

Buyer's guide

How to evaluate an LLM security platform

This guide is for security leaders and engineering teams comparing LLM and AI agent security platforms. It sets out the criteria that actually distinguish a runtime control from a reporting tool, the questions that surface the difference quickly, and how to structure a short proof of concept. We show GuardBotAI’s own answer to every criterion so you can hold us to the same standard as anyone else you are evaluating.

The single most important question

Before any feature comparison, ask: where does the control sit, and can it be bypassed? A security decision made inside the calling application, or in a library the application could skip, is advisory. A security decision made in the request path, on the way to the provider, is a control. Most evaluation frameworks compare detection quality; the architecture question determines whether detection quality matters at all.

Evaluation criteria, the questions to ask, and our answers

1. Where the control sits

Why it matters. A control inside the calling application can be bypassed by calling the model directly. A control in the request path cannot be routed around without losing access to the provider.

Ask the vendor. “If my application bypasses you entirely, does anything break?”

GuardBotAI’s answer. Yes. Traffic that does not pass through the GuardBotAI gateway receives no policy and no record. The gateway is the enforced control point, not a sidecar.

2. Fail behaviour

Why it matters. Under load or during a fault, a system that fails open silently removes your protection exactly when you need it most.

Ask the vendor. “If your policy check cannot complete, is the request forwarded?”

GuardBotAI’s answer. No. If the key check, policy evaluation, or event write fails, the request is refused. GuardBotAI fails closed.

3. Decision outcomes

Why it matters. Binary allow/block is too blunt for production. You need flag and redact so policy can act without breaking legitimate work.

Ask the vendor. “What outcomes can a request receive, and can I record before enforcing?”

GuardBotAI’s answer. Allow, flag, redact, or block. Every project can run in monitoring mode first so you can measure impact before enforcement.

4. Agent constraints

Why it matters. Detecting a bad prompt is not enough; a successful injection must still be unable to do damage.

Ask the vendor. “Can you restrict tools, arguments, and destinations, and stop an agent mid-flight?”

GuardBotAI’s answer. Policy can prohibit tools and actions and allowlist destinations. Emergency containment stops a project's traffic immediately and is checked before every forward.

5. Evidence and audit

Why it matters. You will have to prove behaviour to an auditor, a customer, or a court. Editable logs are not evidence.

Ask the vendor. “Can your own administrators alter decision records?”

GuardBotAI’s answer. Decision events are hash-chained and append-only. Administrative actions — key creation and revocation, policy and mode changes, containment — write to a separate append-only audit log.

6. Data handling

Why it matters. The platform sees your prompts. What it stores determines your exposure if it is breached.

Ask the vendor. “Do you store raw prompts or secrets?”

GuardBotAI’s answer. Decision records carry redacted context; raw secrets are never stored in a decision record. We do not train models on customer data.

7. Bypass resistance of claims

Why it matters. Vendors demonstrate best cases. You need to know what is not covered.

Ask the vendor. “What do you explicitly not claim to detect or stop?”

GuardBotAI’s answer. Our first-line engine is deterministic pattern and policy evaluation, not a semantic classifier. We do not claim to catch every attack, we hold no external certification, and we publish this on our security status page.

8. Pricing transparency

Why it matters. Hidden pricing signals a sales process, not a product. You should be able to start without a procurement cycle.

Ask the vendor. “Can I see full pricing and start today?”

GuardBotAI’s answer. Yes. Developer $49/month, Growth $349/month, annual at ten monthly payments. Enterprise from $2,497/month is sales-assisted. The sensor add-on is $99/month.

Red flags in a vendor conversation

Detection rates without a methodology. “We catch 99 percent of attacks” with no published test set is marketing, not evidence.
Unlabelled demonstrations. If the dashboard you are shown is sample data, it should say so on the screen. If it does not say so, ask.
Failing open described as “high availability”. Continuing to forward when the check fails is not availability; it is absence of the control.
Editable audit logs. Any record an administrator can alter will not survive an audit, a dispute, or an incident review.
Certifications implied but not named. “Enterprise grade” is not a certification. If a standard is claimed, ask for the certificate and its scope.

Running a proof of concept in one week

Day 1. Pick one non-critical application. Point it at the gateway, issue a project key, and run in monitoring mode.
Days 2–3. Send real traffic. Review what was recorded and what policy would have blocked, flagged, or redacted.
Day 4. Run adversarial tests: direct injection, system-prompt extraction, hidden instructions in an uploaded document, tool coercion, exfiltration attempts.
Day 5. Test the operational claims: revoke the key and confirm traffic stops; engage containment and confirm the project is refused while nothing else is affected.
Day 6. Enable enforcement on the tuned policy and watch for legitimate traffic being blocked.
Day 7. Review the records: can you prove what happened, who changed what, and that nothing was edited? That proof is what you are buying.

Frequently asked questions

How should enterprises evaluate LLM security vendors?: Work from the request path outwards: where does the control sit, what happens when it fails, what outcomes can it return, how does it constrain agents, and what evidence does it produce? Then test it: run adversarial prompts against a monitored deployment before believing any claim.
Should I run monitoring before enforcement?: Yes. Monitoring mode records what would have been blocked without changing behaviour, so you can tune policy against real traffic and demonstrate impact internally before enforcement alters any user experience.
Is a demo console evidence the platform works?: No. A console demonstration shows how the policy engine behaves on inputs you type, but it says nothing about whether enforcement runs on real traffic. Ask the vendor to label demonstration screens clearly and to show a real request passing through the live gateway in your own account.
How long should a proof of concept take?: Days, not months. Pointing one non-critical application at a gateway, issuing a key, and running in monitoring mode should take under an hour. If a vendor cannot get you that far quickly, the product is services-led and that should be priced into your decision.

Start the evaluation

Review pricing, try the Shield console with your own adversarial prompts, read our current verification position on the security status page, or request an enterprise quote. Keep reading with the prompt injection hub and the OWASP LLM Top 10 guide.