Last updated 06-28-2026
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Patronus AI
Patronus AI is a research lab and product company focused on evaluating, monitoring, and simulating AI systems so teams can deploy LLM applications and agents with more confidence. Its core platform covers experiments, logging, comparisons, and traces, while research programs like Digital World Models aim to simulate realistic digital workflows for long-horizon agent training.
The company has published widely cited evaluation work, including Lynx for hallucination detection, Glider as a small language model judge, and benchmarks such as FinanceBench. Percival, its evaluation copilot, analyzes agent traces to surface failure modes and suggest optimizations across reasoning and planning errors.
Patronus AI is built for ML engineers, platform teams, and researchers who need structured testing before and after production. Use cases span RAG quality checks, agent oversight, adversarial dataset testing, and continuous monitoring of live LLM products.
Lynx beats GPT-4 on published hallucination detection benchmarks
Percival copilot flags 20+ failure modes in agent traces
Glider 3B judge scores custom rubrics with span highlighting
Run experiments, logs, traces, and side-by-side comparisons in one place
Ready-made adversarial datasets like FinanceBench and EnterprisePII
Detects 15 agent error modes with auto-generated trace summaries
Digital World Models simulate realistic software workflows for training
Developer tier starts free with $10 in API credits and no credit card required.
Publishes its own evaluation models and benchmarks, including Lynx, Glider, and FinanceBench.
Covers the full eval lifecycle from offline experiments to production logs and traces.
Developer tier limits Experiments, Logs, and Traces to the last two weeks.
Enterprise pricing and advanced security options require booking a sales call.
Product scope spans multiple offerings, which can take time to map to your workflow.
Does Patronus AI have a free plan?
Yes. Patronus AI offers a Developer tier you can start from app.patronus.ai with no credit card required. It includes $10 in free evaluator API credits, two projects, and access to Experiments, Logs, and Traces from the last two weeks.
What is Percival by Patronus AI?
Percival is Patronus AI's evaluation copilot for agentic systems. It analyzes agent traces, detects more than 20 failure modes, and suggests optimizations for reasoning and planning errors. A chat assistant is also available to interact with Percival inside the platform.
What is Lynx on Patronus AI?
Lynx is Patronus AI's hallucination detection model for RAG systems. The company reports that Lynx (70B) achieved the highest accuracy on published hallucination tasks, outperforming models such as GPT-4. Lynx is available in 8B and 70B versions.
What datasets does Patronus AI provide?
Patronus AI maintains off-the-shelf adversarial testing sets for specific use cases, including FinanceBench with 10,000 financial Q&A pairs, SimpleSafetyTests for LLM safety risks, and EnterprisePII for detecting business-sensitive information in enterprise text.
How does Patronus AI API pricing work?
Patronus AI charges usage-based API rates on the Developer tier: $10 per 1,000 small evaluator calls, $20 per 1,000 large evaluator calls, and $10 per 1,000 eval explanations. New Developer accounts start with $10 in free credits.
Does Patronus AI offer enterprise deployment options?
Yes. Patronus AI's Enterprise plan includes unlimited platform access, on-prem or dedicated VPC deployment, custom data retention, SSO, higher API rate limits, volume discounts, and custom eval model fine tuning. Pricing requires booking a call with sales.