Best AI LLM Evaluation Tools in 2026
Updated
In short: Weights & Biases is ranked #1 of 30 as of 4 October 2026, ahead of Evidently AI and Opik. The best-ranked option with a free plan is Evidently AI. The lowest first paid tier on this page is Opik at $19/mo.
AI LLM evaluation tools help you assess language-model behavior and the prompts or models behind it. Compared on evaluation methods, model support, and safety evaluations, the products also vary in listed deployment options and API access. Prompt versioning is another point to consider if tracking prompt changes matters to your work. Weights & Biases, Evidently AI, and Opik are among the tools you can examine. Check the free-plan and paid-from details to compare access as well. Start with the evaluations you need to run, then consider which listed capabilities and deployment details fit the way you work with models.
30 AI LLM evaluation tools ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
30ranked
17free plans on this page
$19/molowest paid tier
4 Oct 2026last checked
AI LLM Evaluation Tools, ranked on how quickly a newcomer can get going. 17 of the 25 on this page can be tried for free.
- 1 Weights & BiasesPaid from $60/mo
- Free to practise on: yes
- Free trial: yes
- Well documented: yes
- Runs where you work: yes
- 2 Evidently AIPaid from $80/mo
- Free to practise on: yes
- Free trial: yes
- Well documented: yes
- Runs where you work: yes
- 3 OpikPaid from $19/mo
- Free to practise on: yes
- Free trial: yes
- Well documented: yes
- Runs where you work: not on record
- 4 Maxim AIPaid from $29/mo
- Free to practise on: yes
- Free trial: yes
- Well documented: yes
- Runs where you work: not on record
- 5 VellumPaid from $30/mo
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: yes
- 6 PromptfooFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: yes
- 7 DeepEvalFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: yes
- 8 GiskardFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 9 LangfusePaid from $29/mo
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 10 Rhesis AIFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 11 BraintrustPaid from $249/mo
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 12 GalileoPaid from $100/mo
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 13 NVIDIA NeMo EvaluatorFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 14 Confident AIPaid from $200/mo
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 15 OpenAI Evals
- Free to practise on: not on record
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 16 Pydantic Evals
- Free to practise on: not on record
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 17 UpTrain
- Free to practise on: not on record
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 18 Ragas
- Free to practise on: not on record
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 19 Parler-TTS
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 20 LangSmithPaid from $39/mo
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 21 LangWatchPaid from €29/mo
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 22 OpenCompass
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 23 HELM
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 24 HoneyHive
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 25 Inspect AIFree plan
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
Compare all 25 in a table
| # | Platform | Score | Free plan | From | Free plan | Paid from | Evaluation methods | Model support |
|---|---|---|---|---|---|---|---|---|
| 1 | Weights & Biases | 8.0 | Free plan | $60/mo | Yes | 60 /mo | — | — |
| 2 | Evidently AI | 7.9 | Free plan | $80/mo | Yes | — | — | — |
| 3 | Opik | 7.7 | Free plan | $19/mo | Yes | 19 /mo | — | — |
| 4 | Maxim AI | 7.6 | Free plan | $29/mo | Yes | — | — | — |
| 5 | Vellum | 7.4 | Free plan | $30/mo | Yes | 30 /mo | — | — |
| 6 | Promptfoo | 7.3 | Free plan | Free | Yes | — | — | — |
| 7 | DeepEval | 7.2 | Free plan | Free | Yes | — | — | — |
| 8 | Giskard | 7.1 | Free plan | Free | Yes | — | — | — |
| 9 | Langfuse | 7.1 | Free plan | $29/mo | Yes | 29 /mo | — | — |
| 10 | Rhesis AI | 7.1 | Free plan | Free | Yes | — | offline evaluation, online trace metrics, LLM-as-a-judge, custom metrics, single-turn testing, multi-turn testing, adversarial red-teaming | OpenAI, Anthropic, Google Gemini, Azure OpenAI, Mistral, Cohere, Groq, Together AI, Perplexity, Replicate, Ollama, vLLM, LiteLLM Proxy |
| 11 | Braintrust | 7.0 | Free plan | $249/mo | Yes | 249 /mo | — | — |
| 12 | Galileo | 7.0 | Free plan | $100/mo | Yes | 100 /mo | — | — |
| 13 | NVIDIA NeMo Evaluator | 7.0 | Free plan | Free | — | — | Built-in benchmarks, exact match, fuzzy match, multiple-choice regex, answer-line, numeric match, code sandbox, LLM-as-judge, JSON-schema validation, regression comparison, quality gates | OpenAI-compatible model endpoints, NVIDIA API Catalog, vLLM, NIM, local vLLM, SGLang, TensorRT-LLM, vision-language models |
| 14 | Confident AI | 6.8 | Free plan | $200/mo | Yes | 200 /mo | — | — |
| 15 | OpenAI Evals | 6.5 | No | — | — | — | basic exact/match evaluations, model-graded evaluations, custom evaluation logic, academic benchmarks, meta-evaluations | OpenAI API models and custom CompletionFunction implementations |
| 16 | Pydantic Evals | 6.5 | No | — | Yes | — | Deterministic checks; custom evaluators; LLM judges; G-Eval; performance checks; report evaluators; span-based evaluation; agentic trajectory evaluation | OpenAI; Anthropic; Gemini; xAI; Bedrock; Cerebras; Cohere; Groq; Hugging Face; Mistral; OpenRouter; and other listed Pydantic AI providers |
| 17 | UpTrain | 6.5 | No | — | — | — | preconfigured checks; custom prompt evaluations; custom Python evaluations; model-graded evaluations; classification; chain-of-thought classification; regression testing; experiments | OpenAI; Azure; Claude; Mistral; Together AI; Anyscale; Ollama; Hugging Face; Replicate; custom endpoints |
| 18 | Ragas | 6.2 | No | — | Yes | — | — | — |
| 19 | Parler-TTS | 5.7 | No | — | — | — | — | — |
| 20 | LangSmith | 5.6 | Free plan | $39/mo | Yes | — | — | — |
| 21 | LangWatch | 5.6 | Free plan | €29/mo | Yes | — | — | — |
| 22 | OpenCompass | 5.6 | No | — | — | — | objective; subjective; discriminative; generative; LLM-as-a-judge | Hugging Face models; API-based models; custom models; OpenAI; Anthropic; Gemini; Qwen; GLM; DeepSeek |
| 23 | HELM | 5.5 | No | — | — | — | — | — |
| 24 | HoneyHive | 5.5 | No | — | Yes | — | — | — |
| 25 | Inspect AI | 5.4 | Free plan | Free | — | — | — | — |
Is your platform on this list?
Numbered spots on this list can be sponsored, and a sponsored row is labelled as paid.
Questions about this list
Which AI LLM evaluation tool is ranked first on The Geeks Club?
Weights & Biases is ranked #1 of 30 with a score of 8.0. Evidently AI is second and Opik third.
How many of these have a free plan?
17 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, Opik has the lowest first paid tier we found: $19/mo.
How is this list ranked?
Ranked on how quickly a newcomer can get going: documentation depth, a free tier or trial, and the platforms it runs on.