LLM Testing Services for Reliable LLM Apps

Ship reliable apps with our
LLM testing services

We test chatbots, copilots, and AI agents end to end, so your users get answers they can trust.

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Launch your LLM app without the surprises

LLM apps fail in ways regular software doesn’t. They make up facts with total confidence, leak data to a clever trick question, or slow down when traffic spikes.

LLM testing catches these problems before your users do. It checks that your large language model app gives accurate answers, stays secure, and holds up under load, release after release. Since LLMs never answer the same way twice, we test the rules every answer must follow, not one exact reply.

The result: on-time launches, safe data, and updates that don’t break what already works.

Performance – latency – resource utilization – scalability – uptime Language Proficiency – grammar and syntax – lexical diversity and richness – contextual awareness – multilingual capabilities Model Behavior – harmful content generation – privacy and data leakage – prompt injection – tone of voice Model Accuracy – hallucination detection – summarization capabilities – output consistency – adversarial testing

Our Large Language Model Testing Services

Output Validation

We rigorously test your LLM’s responses for accuracy, relevance, and adherence to desired tone. With our large language model audit, you’ll identify and mitigate biases or potential hallucinations, ensuring consistent and trustworthy outputs from your LLM models.

Performance & Scalability

We assess your large language model’s performance under various loads, ensuring optimal speed and resource utilization. With our LLM QA testing, you’ll verify your system’s scalability to handle increasing user demand in production environments.

Safety & Security Assessment

Our LLM testing services include comprehensive security checks to uncover vulnerabilities and guard against adversarial attacks. We ensure your LLM adheres to ethical guidelines, protecting sensitive data and user trust.

Prompt Testing & Optimization

Effective prompt design is crucial for optimal LLM behavior. We test your prompts and system instructions against real and adversarial inputs, then refine them through continuous testing to get consistent, on-brand responses.

LLM Application Testing

We test the product around the model: chat UI, APIs, integrations with your systems, and fallback behavior when the model times out, errors, or refuses. Building autonomous workflows? Our AI agent testing covers tool calls and multi-step tasks.

Data Integrity & Quality Testing

Our LLM testing solutions comprise thorough dataset analysis to identify inconsistencies and biases, as well as gaps in its accuracy, diversity, and completeness. This involves examining data schema, lineage, and historical usage patterns to detect anomalies.

Selected Cases

Granola

Granola

United Kingdom
Ensured the rock-solid stability this AI notepad needed to reach a $1.5B valuation and expand into the B2B market
Sitch

Sitch

United States
Delivered the rock-solid app quality this AI matchmaker needed to expand across the US and secure $6.7M in funding

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Types of LLM Testing

Bias & Fairness Testing

We meticulously assess LLM outputs for biased or unfair treatment across different demographics. Our LLM testing and validation services help identify and mitigate algorithmic bias, promoting equitable and ethical AI interactions.

Compliance & Regulatory Testing

Our specialists validate adherence to data privacy laws (e.g., GDPR, CCPA) and assess compliance with industry standards in sectors such as healthcare, finance, and education, ensuring your LLM operates within the necessary legal and sectoral frameworks.

Localization & Internationalization Testing

We ensure consistent performance of your LLM across multiple languages and cultures, checking for contextually appropriate and culturally sensitive outputs to guarantee global relevance and user acceptance.

User Experience Testing

We test your LLM’s conversational flow and natural interaction, striving to improve overall user satisfaction with its responses. With our LLM testing services, you’ll ensure a truly intuitive and engaging experience for end users.

RAG Testing

Wrong documents in, wrong answers out. Our RAG testing checks that your retrieval pipeline finds the right sources, that answers stay grounded in them, and that gaps in your knowledge base don’t turn into confident hallucinations.

LLM Regression Testing

Every prompt edit, model upgrade, or retrieval change can break answers that used to work. We build an automated LLM regression testing suite from your critical scenarios and run it on every release, so drops in accuracy, safety, or format never reach users.

LLM Quality Assurance from Strategy to Sign-Off

Risk-based test strategy

A QA strategy built around your use cases and risks.

QA on your schedule

Test cycles planned around how often you ship.

Tests for changing answers

Cases check facts, tone, and limits, not exact wording.

Consistency checks

Each case runs several times to expose inconsistent answers.

Clear release reports

A clear pass, fail, and open-risk report every release.

Confident release decisions

Release calls backed by test results, not gut feel.

Why Choose QAwerk for LLM Testing Services?

Specialized LLM Expertise

Drawing from years of experience testing complex systems and AI products, like the chatbot behind an AI matchmaking app, QAwerk ensures your large language models are high-performing and reliable. Our team includes 30+ senior QA engineers with specialized training and deep experience in LLM testing.

Robust Performance & Stability

We excel at validating performance and stability under heavy loads for critical systems, ensuring your LLM remains quick, stable, and responsive. QAwerk helped increase a digital growth platform’s regression-testing speed by 50% and ensured it ran optimally 24/7, capabilities crucial for real-time LLM demands.

Comprehensive Security & Safety

With a strong track record in testing secure financial transactions, we proactively identify vulnerabilities and protect against jailbreak attacks. We ensure your LLM handles sensitive data safely and maintains user trust.

Advanced Automation for Efficiency

QAwerk builds robust automation frameworks and has automated 76% of the regression suite for an AI notepad now valued at $1.5B. Our expertise in test automation accelerates your LLM development and release cycles.

Proven Client Success

Our client solutions have achieved significant milestones, from securing a zero-bug product launch, tripling projected install numbers, and attaining 80% likes on Steam. We reliably deliver updates to top-tier clients like Microsoft and IBM, driving significant market impact.

End-to-End Quality Partnership

We guide you from the initial AI software testing strategy to final checks, offering comprehensive support. QAwerk will ensure the release of an LLM solution you can be proud of, and one which you can be confident in its performance.

QAwerk continuously helps test both our desktop and mobile apps. They do automated and manual testing across all functionality, which covers everything from installation to UX, all the way to AI-generated responses. The team has been able to spot bad bugs before they were released, saving us from disaster! We’ve also generally been able to keep shipping quickly and not be blocked on our limited testing availability. They’re always on time, reliable, responsive, and reactive to our needs, which often change last minute. Their communication and attention to detail in reporting bugs are impressive. They feel like they’re on our team both figuratively and literally! Would recommend!
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Vicky Firth
We worked with QAwerk on a new mobile app. They develop test plans, continue to do regression testing, and are also developing automated test coverage. I was really impressed with the depth and thoughtfulness of all the work, and even giving feedback on the app functionality itself. QAwerk has been very responsive to requests—I'm not sure when they ever sleep! The team is very clear and organized with managing the overall project and communication. Highly recommend!
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Gavin Zuchlinski
QAwerk is proactive and helpful. QAwerk has conducted comprehensive manual and automated testing, including functional, regression, and usability testing, alongside automated tests covering a wide range of scenarios. They provided detailed bug reports with prioritization recommendations and worked with our team to solve them. Key deliverables include test plans, test cases, automated test scripts, and regular status updates.
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Pablo Alba Chao

Other Services We Offer

Regression Testing

Regression testing is crucial for the stability of LLMs as models and applications evolve. It actively prevents new changes from breaking existing functionality and accuracy, thereby safeguarding your LLM investments.

Automated Testing

Testing LLMs is a process that can be made efficient through automation. This accelerates repetitive test cycles, ensuring broad and consistent test coverage for your models and applications, thereby powering rapid LLM development.

Manual Testing

Discover subtle LLM behaviors and critical edge cases. Our expert manual testers probe your model with human intuition, uncovering nuanced issues, biases, or unexpected responses that automated scripts might miss.

Penetration Testing

Proactively expose and eliminate weaknesses within your LLM ecosystem. We’ll help you uncover and resolve vulnerabilities, leading to protected sensitive data, preventing jailbreak attacks, and ensuring robust security.

LLM Evaluation

Testing shows your LLM app works; evaluation shows how good its answers are. We build golden datasets, define quality metrics, and calibrate automated judges against human reviewers, giving you a scored baseline for every release.

FAQ

What is LLM Testing?

LLM testing is the process of verifying that an application built on a large language model works as intended before and after release. It checks output accuracy and consistency, security against prompt injection and jailbreaks, performance under load, integrations, and regressions after prompt or model changes. The goal is an LLM product you can release with confidence.

What vulnerabilities does LLM testing uncover?

LLM testing uncovers critical vulnerabilities unique to generative AI. This includes detecting hallucinations, inaccurate outputs, and bias in responses. Our LLM security testing services reveal weaknesses leading to jailbreak attacks or harmful content, protecting data, and preventing broken user trust. We also pinpoint performance bottlenecks causing unexpected app behavior.

How long does LLM testing take?

A focused test cycle might take a few weeks, while comprehensive testing for complex production environments could span months.

How do you protect our data during testing?

Protecting your data is our top priority during LLM testing. We adhere to strict security protocols and conduct all testing in secure, isolated environments. Our team operates under confidentiality agreements, ensuring proprietary data and models remain private. We also comply with data privacy regulations, protecting your sensitive information.

How is LLM testing different from LLM evaluation?

LLM testing checks that the whole product works: features, integrations, security, performance, and stability across releases. LLM evaluation measures the quality of the model’s answers with metrics such as faithfulness and task completion, scored against agreed thresholds. Most production AI needs both. Our LLM evaluation services cover the scoring side.

How do you test non-deterministic LLM output?

Instead of expecting one exact answer, we define what every acceptable answer must contain and what it must never do. Each test case checks facts, format, tone, and safety rules, and we run it several times to measure consistency. Fixed model settings and meaning-based comparisons keep results reproducible, and cases that pass only sometimes are flagged for review.

How much do LLM testing services cost?

The cost depends on scope: how many LLM features and integrations you have, how many languages you support, and whether you need a one-time test cycle or ongoing QA. After a short call, we send an estimate with a clear scope and timeline.

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TESTING PROJECTS
ACCOMPLISHED

110M

USERS OF SOLUTIONS
WE TEST

11+

YEARS TESTING

30+

SENIOR QA ENGINEERS