Top 20 LLM Evaluation Tools 2026

Open-source LLM eval, acquired by OpenAI (March 2026)

Popular open-source evaluation framework with 125 red team plugins, ~45 assertions, and 60+ providers. Acquired by OpenAI in March 2026. 10.5K GitHub stars, 300K+ developers. Free OSS, SaaS from $60/mo.

Python-native eval framework with growing red team

Python-first eval framework with 50+ metrics and 20+ attack methods (via DeepTeam). Native pytest integration. 12.8K GitHub stars, 400K+ monthly downloads. Free OSS, Confident AI from $19.99/seat.

Closed-source AI evaluation platform

AI evaluation platform focused on production eval workflows and CI/CD integration. Closed source, no self-hosting.

Databricks' ML lifecycle platform

Open-source ML lifecycle management with basic LLM eval. SaaS requires Databricks. No security testing.

EU-focused red teaming with adaptive agents

European open-source AI red teaming platform with 40-50 vulnerability probes, 10-15 metrics, and dynamic multi-turn red teaming. 2 compliance frameworks. Enterprise SaaS requires paid plan.

NVIDIA's LLM vulnerability scanner

Open-source LLM vulnerability scanner with 37+ probe modules. CLI only, no SaaS or eval capabilities.

Microsoft's red team dev library

Python Risk Identification Toolkit for generative AI. Developer library, not a platform.

Enterprise AI security for SOC teams

Enterprise AI security platform with MITRE ATLAS alignment. SOC-focused, not developer-friendly.

Enterprise LLM firewall (sub-50ms claimed), acquired by Check Point

AI security platform with enterprise-grade LLM firewall (sub-50ms latency claimed by Lakera; EvalGuard publishes 2.57ms p95 measured at /trust/latency), proprietary threat intelligence, and 5-8 metrics. Acquired by Check Point. No eval, no red teaming, no tracing, no prompt IDE. Free (10K req/mo), Enterprise custom.

Meta's safety benchmarks and Llama Guard

Meta's open-source AI safety initiative with CyberSecEval and Llama Guard. Benchmarks and models, not a platform.

Best-in-class open-source LLM observability (YC W23)

Leading open-source LLM observability platform with best-in-class tracing, prompt management, and 100+ providers via LiteLLM. Zero red teaming or built-in eval scorers. Free (25K spans), Pro $49/mo.

End-to-end AI evaluation and observability

End-to-end AI evaluation and observability with agent simulation, tracing, cost tracking. 4 compliance certifications (SOC2, HIPAA, ISO 27001, GDPR). Free tier, usage-based pricing.

Best free observability (completely free, 7.8K stars)

Best completely free LLM observability platform with pre-built evaluators and many providers. 7.8K GitHub stars, 2.5M+ downloads. Zero red teaming, no firewall, no gateway, no prompt IDE.

Infrastructure monitoring giant adds LLM features

Industry-leading monitoring platform with recently added LLM observability. Zero evaluation or security testing capabilities.

ML experiment tracking with Weave for LLMs

Leading ML experiment tracking platform. Weave adds basic LLM evaluation but no security testing.

Free eval, locked to OpenAI models

OpenAI's built-in evaluation framework. Free for OpenAI users but completely locked to the OpenAI ecosystem.

GCP-only evaluation tools

Built-in model evaluation on Google Cloud. Works with Google models only, no standalone usage.

Content filtering locked to Azure

Azure's content moderation and prompt shielding. Strong content filtering but limited to Azure ecosystem.

BCG's red teaming Python library

BCG X's open-source toolkit for automated red teaming. Python library only, no SaaS or enterprise features.