Best AI LLM Evaluation Tools in 2026
Updated
In short: Opik is ranked #1 of 29 as of 3 October 2026, ahead of Langfuse and Braintrust. The best-ranked option with a free plan is Langfuse. The lowest first paid tier on this page is Opik at $19/mo.
As language-model applications move into development workflows, evaluation tools can help teams examine model behavior, prompts, and safety. The ranking opens with Opik, Langfuse, and Braintrust. Compare evaluation methods, model support, and safety evaluations to understand the kinds of checks represented by each entry. Prompt versioning can help frame the comparison when prompt changes are part of your process; API access and deployment provide additional dimensions for assessing fit. Free-plan availability and the starting paid price are included as well. Consider what you need to evaluate and how you intend to connect or deploy a tool, then weigh those needs against the listed criteria.
29 AI LLM evaluation tools ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
| # | Platform | Score | Why | From | Free plan | Paid from | Evaluation methods | |
|---|---|---|---|---|---|---|---|---|
| 1 | Opik | 8.6 | RecognisedAPIDocumented | $19/mo | Yes | 19 /mo | — | View |
| 2 | Langfuse | 8.6 | RecognisedAPIDocumented | $29/mo | Yes | 29 /mo | — | View |
| 3 | Braintrust | 8.5 | RecognisedAPIDocumented | $249/mo | Yes | 249 /mo | — | View |
| 4 | Confident AI | 8.4 | RecognisedAPIDocumented | $200/mo | Yes | 200 /mo | — | View |
| 5 | Galileo | 8.4 | RecognisedAPIDocumented | $100/mo | Yes | 100 /mo | — | View |
| 6 | Maxim AI | 8.2 | RecognisedAPIDocumented | $29/mo | Yes | — | — | View |
| 7 | Evidently AI | 8.1 | RecognisedAPIDocumented | $80/mo | Yes | — | — | View |
| 8 |  Rhesis AI | 7.9 | RecognisedAPIDocumented | Free | Yes | — | offline evaluation, online trace metrics, LLM-as-a-judge, custom metrics, single-turn testing, multi-turn testing, adversarial red-teaming | View |
| 9 |  NVIDIA NeMo Evaluator | 7.7 | RecognisedAPIDocumented | 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 | View |
| 10 | DeepEval | 7.5 | RecognisedAPIDocumented | Free | Yes | — | — | View |
| 11 |  UpTrain | 7.4 | RecognisedAPIDocumented | — | — | — | preconfigured checks; custom prompt evaluations; custom Python evaluations; model-graded evaluations; classification; chain-of-thought classification; regression testing; experiments | View |
| 12 |  OpenAI Evals | 7.3 | RecognisedAPIDocumented | — | — | — | basic exact/match evaluations, model-graded evaluations, custom evaluation logic, academic benchmarks, meta-evaluations | View |
| 13 | Weights & Biases | 7.1 | RecognisedAPIDocumented | $60/mo | Yes | 60 /mo | — | View |
| 14 | LangSmith | 6.8 | RecognisedAPIDocumented | — | Yes | — | — | View |
| 15 |  Arize Phoenix | 6.7 | RecognisedAPIDocumented | — | Yes | — | — | View |
| 16 | Promptfoo | 6.7 | RecognisedAPIDocumented | Free | Yes | — | — | View |
| 17 |  Pydantic Evals | 6.6 | RecognisedAPIDocumented | — | Yes | — | Deterministic checks; custom evaluators; LLM judges; G-Eval; performance checks; report evaluators; span-based evaluation; agentic trajectory evaluation | View |
| 18 | LangWatch | 6.3 | RecognisedAPIDocumented | — | Yes | — | — | View |
| 19 | HoneyHive | 6.2 | RecognisedAPIDocumented | — | Yes | — | — | View |
| 20 | Giskard | 6.1 | RecognisedAPIDocumented | — | Yes | — | — | View |
| 21 |  Vellum | 5.6 | RecognisedAPIDocumented | $30/mo | Yes | 30 /mo | — | View |
| 22 | Ragas | 5.5 | RecognisedAPIDocumented | — | Yes | — | — | View |
| 23 | Inspect AI | 5.4 | RecognisedAPIDocumented | — | — | — | — | View |
| 24 |  OpenCompass | 5.3 | RecognisedAPIDocumented | — | — | — | objective; subjective; discriminative; generative; LLM-as-a-judge | View |
| 25 | HELM | 5.0 | RecognisedAPIDocumented | — | — | — | — | View |
Is your platform on this list?
Numbered spots on this list can be sponsored. They are labelled, and the editorial order and scores never change for payment.
Questions about this list
Which AI LLM evaluation tool is ranked first on Inferse?
Opik is ranked #1 of 29 with a score of 8.6. Langfuse is second and Braintrust third.
How many of these have a free plan?
11 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 what each maker publishes, open and connectable first: a public API, open-source code, the depth of its documentation and a free tier to try it on. Model lists are sorted by the figure in their title, exactly as each provider publishes it. Paid placements never change a rank.