Best AI LLM Evaluation Tools in 2026
Updated
When your team needs to assess model behavior and prompt quality, LLM evaluation tools bring evaluation methods into focus. Compared on evaluation methods, model support and safety evaluations, the entries help you examine what kinds of checks are available. Prompt versioning is relevant when prompt changes are part of your workflow; API access and deployment offer further points to compare for integration and use. Braintrust, Confident AI and Evidently AI are among the options shown. Free-plan availability and paid-from pricing round out the comparison, helping you balance evaluation capabilities with access and the way you expect to run these tools.
AI LLM Evaluation Tools, one module each.A lit port is something its maker publishes; 25 of 25 with a known API signal have a public API.
- 01 HELM API yesFREE yesDOCS 7.4Free
- 02 Braintrust API yesFREE yesDOCS 7.3$249/mo
- 03 Confident AI API yesFREE yesDOCS 7.3$200/mo
- 04 Evidently AI API yesFREE yesDOCS 7.3$80/mo
- 05 Galileo API yesFREE yesDOCS 7.3$100/mo
- 06 Giskard API yesFREE yesDOCS 7.3Free
- 07 HoneyHive API yesFREE yesDOCS 7.3Free
- 08 Langfuse API yesFREE yesDOCS 7.3$29/mo
- 09 LangSmith API yesFREE yesDOCS 7.3$39/mo
- 10 LangWatch API yesFREE yesDOCS 7.3€29/mo
- 11 Maxim AI API yesFREE yesDOCS 7.3$29/mo
- 12 NVIDIA NeMo Evaluator API yesFREE yesDOCS 7.3Free
- 13 Opik API yesFREE yesDOCS 7.3$19/mo
- 14 Promptfoo API yesFREE yesDOCS 7.3Free
- 15 Rhesis AI API yesFREE yesDOCS 7.3Free
- 16 Weights & Biases API yesFREE yesDOCS 7.3$60/mo
- 17 Arize Phoenix API yesFREE yesDOCS 7.2Free
- 18 Inspect AI API yesFREE yesDOCS 7.2Free
- 19 LM Evaluation Harness API yesFREE yesDOCS 7.2Free
- 20 TruLens API yesFREE yesDOCS 7.2Free
- 21 OpenAI Evals API yesDOCS 7.0
- 22 OpenCompass API yesDOCS 7.0
- 23 Ragas API yesDOCS 7.0
- 24 UpTrain API yesDOCS 7.0
- 25 ARES API yesDOCS 6.9
Compare all 25 in a table
| # | Platform | Score | Free plan | From | Free plan | Paid from | Evaluation methods | Model support |
|---|---|---|---|---|---|---|---|---|
| 1 | HELM | 7.4 | Free plan | Free | ||||
| 2 | Braintrust | 7.3 | Free plan | $249/mo | Yes | 249 /mo | ||
| 3 | Confident AI | 7.3 | Free plan | $200/mo | Yes | 200 /mo | ||
| 4 | Evidently AI | 7.3 | Free plan | $80/mo | Yes | |||
| 5 | Galileo | 7.3 | Free plan | $100/mo | Yes | 100 /mo | ||
| 6 | Giskard | 7.3 | Free plan | Free | Yes | |||
| 7 | HoneyHive | 7.3 | Free plan | Free | Yes | |||
| 8 | Langfuse | 7.3 | Free plan | $29/mo | Yes | 29 /mo | ||
| 9 | LangSmith | 7.3 | Free plan | $39/mo | Yes | |||
| 10 | LangWatch | 7.3 | Free plan | €29/mo | Yes | |||
| 11 | Maxim AI | 7.3 | Free plan | $29/mo | Yes | |||
| 12 | NVIDIA NeMo Evaluator | 7.3 | 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 | ||
| 13 | Opik | 7.3 | Free plan | $19/mo | Yes | 19 /mo | ||
| 14 | Promptfoo | 7.3 | Free plan | Free | Yes | |||
| 15 | Rhesis AI | 7.3 | 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 | |
| 16 | Weights & Biases | 7.3 | Free plan | $60/mo | Yes | 60 /mo | ||
| 17 | Arize Phoenix | 7.2 | Free plan | Free | Yes | |||
| 18 | Inspect AI | 7.2 | Free plan | Free | ||||
| 19 | LM Evaluation Harness | 7.2 | Free plan | Free | ||||
| 20 | TruLens | 7.2 | Free plan | Free | ||||
| 21 | OpenAI Evals | 7.0 | basic exact/match evaluations, model-graded evaluations, custom evaluation logic, academic benchmarks, meta-evaluations | OpenAI API models and custom CompletionFunction implementations | ||||
| 22 | OpenCompass | 7.0 | objective; subjective; discriminative; generative; LLM-as-a-judge | Hugging Face models; API-based models; custom models; OpenAI; Anthropic; Gemini; Qwen; GLM; DeepSeek | ||||
| 23 | Ragas | 7.0 | Yes | |||||
| 24 | UpTrain | 7.0 | 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 | ||||
| 25 | ARES | 6.9 |
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Numbered spots on this list can be sponsored, and a sponsored row is labelled as paid.