# LM Evaluation Harness vs Promptfoo

| Attribute | LM Evaluation Harness | Promptfoo |
|---|---|---|
| **Vioscale score** | 53.7 (40% (low)) | 54.4 (55% (medium)) |
| activity.commits_last_30d | 50 | - |
| adoption.dependent_repos | 252 | - |
| adoption.github_stars | 13,802 | - |
| deployment.options | `{"self_hosted":true}` | `{"cloud":true,"hybrid":true,"on_prem":true,"self_hosted":true}` |
| description.long | A Python-based evaluation framework that enables testing of language models against 60+ standard academic benchmarks with support for various model formats, APIs, and custom evaluation metrics. | A comprehensive LLM security testing solution that automatically scans for vulnerabilities such as prompt injections and jailbreaks through dynamic red teaming. Offers both open-source software for local testing and enterprise SaaS with team collaboration, continuous monitoring, and compliance dashboards. |
| features.capabilities | `{"pricing_model":"free_open_source","architecture_model":"open_source_cli","multi_model_side_by_side_ab_regression_testing":true}` | `{"soc2_type_ii":true,"self_hostable":true,"versioning_model":"UI-hosted registry","non_engineer_editing":false,"llm_judge_or_human_eval":true,"llm_as_a_judge_prompt_grading_framework":true,"ci_cd_github_actions_pipeline_blocking_gates":true,"deterministic_regex_and_json_schema_assertions":true,"red_teaming_and_adversarial_vulnerability_scanning":true}` |
| integrations.count | 5 | 6 |
| integrations.list | `[{"name":"Hugging Face"},{"name":"PyTorch"},{"name":"VLLM"},{"name":"GitHub"},{"name":"OpenAI-compliant APIs"}]` | `[{"name":"OpenAI"},{"name":"Anthropic"},{"name":"Google (Gemini)"},{"name":"DeepSeek"},{"name":"MCP (Model Context Protocol)"},{"name":"CI/CD pipelines"},{"name":"Webhooks"},{"name":"Agent frameworks"},{"name":"CI/CD platforms"},{"name":"GitHub"},{"name":"Python providers"}]` |
| language.primary | Python | - |
| license.spdx | MIT | - |
| market.availability | - | `{"hqCountry":"US","primaryMarkets":["US"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"cli":true}` | `{"cli":true,"web":true}` |
| pricing | `{"type":"open_source","summary":"Free and open source","freeTier":true,"sourceUrl":"https://github.com/pricing","retrievedAt":"2026-08-21T11:02:40.793Z"}` | `{"type":"hybrid","plans":[{"free":true,"name":"Community","features":["All LLM evaluation features","All model providers and integrations","Red teaming (10k probes/month)","Custom integration with your own app","Run locally or self-host on your own infrastructure","Vulnerability scanning","Community support"],"components":[{"kind":"fixed","amount":0,"period":"month","currency":"USD"}],"description":"Open-source version for individual developers and small teams","contactSales":false,"includedLimits":{"red_teaming_probes":"10k/mo"}},{"free":false,"name":"Enterprise","features":["All Community features","Custom red teaming limits","Team sharing & collaboration","Continuous monitoring","Centralized security/compliance dashboard","Customizable attack profiles and target settings","SSO and granular permission profiles","Promptfoo API access","Managed cloud deployment","Professional services support","Priority support & SLA guarantees"],"description":"Managed cloud platform with team collaboration, continuous monitoring, and compliance features","contactSales":true},{"free":false,"name":"On-Premise","features":["Complete data isolation","On-premise deployment"],"description":"Custom deployment for organizations requiring full control over infrastructure","contactSales":true}],"summary":"Free open-source Community tier; Enterprise and On-Premise plans with custom pricing","currency":"USD","freeTier":true,"sourceUrl":"https://www.promptfoo.dev/pricing/","retrievedAt":"2026-08-19T18:21:49.377Z"}` |
| pricing.free_tier | yes | yes |
| pricing.model | commercial | freemium |
| pricing.price_level | free | low |
| pricing.transparent | yes | no |
| release.cadence_days | 66 | - |
| release.history | `[{"url":"https://github.com/EleutherAI/lm-evaluation-harness/releases/tag/v0.4.12","date":"2026-05-11T13:04:19Z","type":"stable","version":"v0.4.12"},{"url":"https://github.com/EleutherAI/lm-evaluation-harness/releases/tag/v0.4.11","date":"2026-02-13T20:21:47Z","type":"stable","version":"v0.4.11"},{"url":"https://github.com/EleutherAI/lm-evaluation-harness/releases/tag/v0.4.10","date":"2026-01-27T19:56:53Z","type":"stable","version":"v0.4.10"},{"url":"https://github.com/EleutherAI/lm-evaluation-harness/releases/tag/v0.4.9.2","date":"2025-11-26T23:27:06Z","type":"stable","version":"v0.4.9.2"},{"url":"https://github.com/EleutherAI/lm-evaluation-harness/releases/tag/v0.4.9.1","date":"2025-08-04T11:36:05Z","type":"stable","version":"v0.4.9.1"},{"url":"https://github.com/EleutherAI/lm-evaluation-harness/releases/tag/v0.4.9","date":"2025-06-19T14:18:27Z","type":"stable","version":"v0.4.9"},{"url":"https://github.com/EleutherAI/lm-evaluation-harness/releases/tag/v0.4.8","date":"2025-03-05T07:49:46Z","type":"stable","version":"v0.4.8"},{"url":"https://github.com/EleutherAI/lm-evaluation-harness/releases/tag/v0.4.7","date":"2024-12-17T10:37:09Z","type":"stable","version":"v0.4.7"},{"url":"https://github.com/EleutherAI/lm-evaluation-harness/releases/tag/v0.4.6","date":"2024-11-25T13:38:29Z","type":"stable","version":"v0.4.6"},{"url":"https://github.com/EleutherAI/lm-evaluation-harness/releases/tag/v0.4.5","date":"2024-10-08T21:06:05Z","type":"stable","version":"v0.4.5"},{"url":"https://github.com/EleutherAI/lm-evaluation-harness/releases/tag/v0.4.4","date":"2024-09-05T15:13:13Z","type":"stable","version":"v0.4.4"},{"url":"https://github.com/EleutherAI/lm-evaluation-harness/releases/tag/v0.4.3","date":"2024-07-01T14:00:36Z","type":"stable","version":"v0.4.3"},{"url":"https://github.com/EleutherAI/lm-evaluation-harness/releases/tag/v0.4.2","date":"2024-03-18T13:07:28Z","type":"stable","version":"v0.4.2"},{"url":"https://github.com/EleutherAI/lm-evaluation-harness/releases/tag/v0.4.1","date":"2024-01-31T15:29:14Z","type":"stable","version":"v0.4.1"},{"url":"https://github.com/EleutherAI/lm-evaluation-harness/releases/tag/v0.4.0","date":"2023-12-04T15:08:53Z","type":"stable","version":"v0.4.0"},{"url":"https://github.com/EleutherAI/lm-evaluation-harness/releases/tag/v0.3.0","date":"2022-12-08T08:34:37Z","type":"stable","version":"v0.3.0"},{"url":"https://github.com/EleutherAI/lm-evaluation-harness/releases/tag/v0.2.0","date":"2022-03-07T02:12:23Z","type":"stable","version":"v0.2.0"},{"url":"https://github.com/EleutherAI/lm-evaluation-harness/releases/tag/v0.0.1","date":"2021-09-02T02:28:08Z","type":"stable","version":"v0.0.1"}]` | - |
| security.iso27001 | - | yes |
| security.scorecard | 5.6 | - |
| security.soc2 | - | yes |
| security.vulnerabilities | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=pypi&package_name=lm-eval&per_page=100","last_12m":0,"max_severity":null}` | - |

## Capabilities (AI Evals Testing)

| Capability | LM Evaluation Harness | Promptfoo |
|---|:--:|:--:|
| **Capabilities** |  |  |
| Architecture model | Open source CLI | - |
| LLM as a judge prompt grading framework | - | ✓ |
| Specialized rag metrics faithfulness context relevance | - | - |
| Deterministic regex and json schema assertions | - | ✓ |
| Synthetic test dataset generation from documents | - | - |
| Ci cd github actions pipeline blocking gates | - | ✓ |
| Red teaming and adversarial vulnerability scanning | - | ✓ |
| Multi model side by side ab regression testing | ✓ | - |
| Human in the loop hitl annotation UI | - | - |
| Dashboard analytics for metric drift over time | - | - |
| SOC2 type ii | - | ✓ |
| Mit or apache permissive oss license | - | - |
| Pricing model | Free open source | - |

*Source: Vioscale. Generated 2026-09-01T15:16:42.780Z. "-" = undocumented, not absent.*