# LM Evaluation Harness vs Promptfoo

| Attribute | LM Evaluation Harness | Promptfoo |
|---|---|---|
| **vioscaleAI score** | 48.2 (35% (low)) | 58.1 (22% (low)) |
| activity.commits_last_30d | 57 | - |
| adoption.dependent_repos | 252 | - |
| adoption.github_stars | 14,221 | - |
| content.faq | `[{"answer":"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. It is indexed under AI Evals Testing.","source":"https://github.com/pricing","question":"What is LM Evaluation Harness?","confidence":0.6},{"answer":"LM Evaluation Harness is open source, so it can be self-hosted and used at no licence cost. It is released under the MIT licence. Pricing changes often, so verify at source before relying on it.","source":"https://github.com/pricing","question":"Is LM Evaluation Harness free to use?","confidence":0.6},{"answer":"LM Evaluation Harness supports a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://github.com/pricing","question":"What platforms does LM Evaluation Harness support?","confidence":0.6},{"answer":"Yes. LM Evaluation Harness can be deployed self-hosted, so it does not have to run on the vendor's infrastructure.","source":"https://github.com/pricing","question":"Can LM Evaluation Harness be self-hosted?","confidence":0.6},{"answer":"We have confirmed 5 integrations for LM Evaluation Harness, including Hugging Face, PyTorch, VLLM, GitHub and OpenAI-compliant APIs. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://github.com/pricing","question":"What does LM Evaluation Harness integrate with?","confidence":0.6},{"answer":"Yes. LM Evaluation Harness is published under the MIT licence, a permissive licence that generally allows commercial use and modification. Licence terms can change between releases, so verify against the repository for the version you intend to use.","source":"https://github.com/EleutherAI/lm-evaluation-harness","question":"Is LM Evaluation Harness open source?","confidence":0.95}]` | `[{"answer":"A CLI and library for testing, evaluating, and red-teaming LLM applications and agents. Automatically identifies vulnerabilities through security scanning and provides remediation guidance. It is indexed under Prompt Management.","source":"https://www.promptfoo.dev/pricing/","question":"What is Promptfoo?","confidence":0.6},{"answer":"Promptfoo does not publish its prices. Pricing is quoted on request, across 3 plans (Community, Enterprise and On-Premise), so the figure depends on your seat count and requirements. We record this as a pricing-transparency signal rather than guessing a number. Pricing changes often, so verify at source before relying on it.","source":"https://www.promptfoo.dev/pricing/","question":"How much does Promptfoo cost?","confidence":0.6},{"answer":"Promptfoo supports the web and a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://www.promptfoo.dev/pricing/","question":"What platforms does Promptfoo support?","confidence":0.6},{"answer":"Yes. Promptfoo can be deployed cloud / SaaS, on-premise and self-hosted, so it does not have to run on the vendor's infrastructure.","source":"https://www.promptfoo.dev/pricing/","question":"Can Promptfoo be self-hosted?","confidence":0.6},{"answer":"We have confirmed 14 integrations for Promptfoo, including OpenAI, Anthropic, Google (Gemini), DeepSeek, MCP (Model Context Protocol), CI/CD pipelines, Webhooks and Agent frameworks, plus 6 more. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://www.promptfoo.dev/pricing/","question":"What does Promptfoo integrate with?","confidence":0.6},{"answer":"We have independently confirmed SOC 2 and ISO 27001 for Promptfoo. Certifications we do not list are ones we have not been able to verify from public sources, which is not the same as Promptfoo not holding them. Always confirm compliance directly before you rely on it.","source":"https://www.promptfoo.dev/blog/SOC2-compliance/","question":"What security certifications does Promptfoo have?","confidence":0.7},{"answer":"Promptfoo is available worldwide. Its primary market is the United States. The vendor is headquartered in the United States.","source":"https://www.promptfoo.dev/pricing/","question":"Where is Promptfoo available?","confidence":0.75}]` |
| deployment.options | `{"self_hosted":true}` | `{"self_hosted":true}` |
| description.long | A framework for conducting few-shot evaluation of language models against various tasks and benchmarks. Supports multiple model backends, custom evaluation metrics, and extensible task definitions for assessing model capabilities and performance. | Automated testing and security evaluation framework for AI applications, with support for comparing multiple model providers and identifying potential vulnerabilities through red teaming and assertion-based validation. |
| 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,"pricing_model":"open-source-self-host","self_hostable":true,"deployment_model":"self-hosted","versioning_model":"UI-hosted registry","architecture_model":"open_source_cli","non_engineer_editing":false,"multi_model_playground":true,"llm_judge_or_human_eval":true,"mit_or_apache_permissive_oss_license":true,"llm_as_a_judge_prompt_grading_framework":true,"ci_cd_github_actions_pipeline_blocking_gates":true,"deterministic_regex_and_json_schema_assertions":true,"multi_model_side_by_side_ab_regression_testing":true,"red_teaming_and_adversarial_vulnerability_scanning":true}` |
| integrations.count | 5 | 8 |
| 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"},{"name":"Azure","native":true,"category":"llm"},{"name":"Bedrock","native":true,"category":"llm"},{"name":"Ollama","native":true,"category":"llm"},{"name":"Gemini"}]` |
| language.primary | Python | - |
| license.spdx | MIT | - |
| market.availability | - | `{"hqCountry":"US","primaryMarkets":["US"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"cli":true,"mac":true,"linux":true,"windows":true}` | `{"cli":true}` |
| pricing | `{"type":"open_source","freeTier":true,"sourceUrl":"https://github.com/pricing","retrievedAt":"2026-10-14T22:30:23.897Z"}` | `{"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 | open_source | open_source |
| pricing.price_level | free | free |
| pricing.transparent | yes | yes |
| release.cadence_days | 72 | - |
| release.history | `[{"url":"https://github.com/EleutherAI/lm-evaluation-harness/releases/tag/v0.4.13","date":"2026-08-31T20:42:30Z","type":"stable","version":"v0.4.13"},{"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 | 5.5 | - |
| security.soc2 | - | yes |
| security.trust_center | https://github.com/security | https://www.promptfoo.dev/blog/tags/security-vulnerability/ |
| 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 | 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 | open-source-self-host |

*Source: vioscaleAI. Generated 2026-10-16T13:19:34.996Z. "-" = undocumented, not absent.*