# LangChain vs vLLM

**Leader by Vioscale score:** LangChain

| Attribute | LangChain | vLLM |
|---|---|---|
| **Vioscale score** | 80.7 (70% (medium)) | 67.6 (67% (medium)) |
| activity.commits_last_30d | 100 | 100 |
| adoption.dependent_repos | 18,663 | 5 |
| adoption.github_stars | 145,063 | 90,137 |
| adoption.package_downloads_weekly | 2,967,570 | 1,098,710 |
| deployment.options | `{"cloud":true,"hybrid":true,"self_hosted":true}` | `{"cloud":true,"on_prem":true,"self_hosted":true}` |
| description.long | LangSmith provides observability through tracing to debug agent behavior, evaluation capabilities to test and score agents with human review and automated assessments, and deployment services to run agents at scale. | An open-source framework that provides optimized LLM inference with low latency and high throughput. It includes continuous batching, memory-efficient attention mechanisms, quantization support, and distributed serving across diverse hardware platforms. |
| features.capabilities | `{"role":"observability","evaluation":true,"a2a_support":true,"mcp_support":true,"open_source":true,"managed_cloud":true,"model_serving":true,"pricing_model":"usage-based-saas","self_hostable":true,"multi_provider":true,"vpc_deployment":true,"otel_compatible":true,"deployment_model":"managed-platform","no_train_on_data":"unknown","streaming_output":true,"human_in_the_loop":true,"llm_observability":true,"prompt_management":true,"framework_agnostic":true,"multi_language_sdk":true,"memory_architecture":"persistent","orchestration_model":"multi-agent-sequential","tool_function_calling":true,"code_execution_sandbox":true,"model_provider_agnostic":true}` | `{"role":"serving","open_source":true,"managed_cloud":false,"model_serving":true,"self_hostable":true,"multi_provider":true,"vpc_deployment":true,"otel_compatible":true,"gpu_acceleration":true,"kubernetes_native":true,"llm_observability":true,"framework_agnostic":true,"continuous_batching":true,"multi_model_serving":true,"multi_gpu_multi_node":true,"quantization_support":true,"openai_compatible_api":true,"multi_framework_support":true}` |
| integrations.count | 1,000 | 29 |
| integrations.list | `[{"name":"OpenAI"},{"name":"Anthropic"},{"name":"Cohere"},{"name":"Google"},{"name":"Azure OpenAI"},{"name":"Azure AI Search"},{"name":"Microsoft Fabric"},{"name":"Azure Kubernetes Service"},{"name":"OpaquePrompts"}]` | `[{"name":"Hugging Face"},{"name":"NVIDIA Dynamo"},{"name":"OpenAI-compatible API"},{"name":"Anthropic Messages API"},{"name":"FlashAttention"},{"name":"FlashInfer"},{"name":"CUTLASS"},{"name":"torch.compile"},{"name":"gRPC"},{"name":"GPTQ"},{"name":"AWQ"},{"name":"GGUF"},{"name":"ModelOpt"},{"name":"TorchAO"},{"name":"OpenAI API"},{"name":"Kubernetes"},{"name":"PyTorch"},{"name":"Ray"},{"name":"OpenTelemetry"},{"name":"Prometheus"},{"name":"FastAPI"},{"name":"Transformers"},{"name":"Outlines"},{"name":"Google Cloud TPU"},{"name":"Intel Gaudi"},{"name":"AMD Instinct"},{"name":"Apple Silicon"},{"name":"IBM Spyre"},{"name":"Huawei Ascend"},{"name":"Rebellions NPU"},{"name":"TRTLLM-GEN"},{"name":"CuTeDSL"}]` |
| language.primary | Python | Python |
| license.spdx | MIT | Apache-2.0 |
| market.availability | `{"hqCountry":"US","primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | `{"primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"web":true}` | `{"cli":true,"linux":true}` |
| pricing | `{"type":"subscription","plans":[{"free":true,"name":"Developer","summary":"Free tier: 1 seat, 5k traces/month","features":["1 free seat","5k base traces/month","Tracing and analytics","Access to LangSmith platform"],"minSeats":1,"components":[{"kind":"fixed","amount":0,"period":"month","currency":"USD"}],"description":"Personal projects and single-seat usage","contactSales":false,"includedLimits":{"traces":"5k/month"}},{"free":false,"name":"Plus","summary":"$39/seat/month + usage (LCU/LSU), 10k traces included, 1 free small deployment","features":["Unlimited seats","10k base traces/month","1 free small serverless deployment","Full tracing and analytics","Evaluation tools"],"commitment":"monthly","components":[{"kind":"per_unit","unit":"seat","amount":39,"period":"month","currency":"USD"},{"per":{"qty":1,"unit":"LCU"},"kind":"metered","amount":1.5,"currency":"USD"},{"per":{"qty":1,"unit":"LSU"},"kind":"metered","amount":1,"currency":"USD"}],"description":"Teams with moderate usage and collaboration requirements","contactSales":false,"includedLimits":{"traces":"10k/month","serverless_deployments":"1 small free"}},{"free":false,"name":"Enterprise","summary":"Custom pricing, annual billing, includes premium support and white-glove onboarding","features":["Advanced administration","Dedicated support","Custom deployments","White-glove onboarding","Proactive monitoring","Premium SLA"],"commitment":"annual","description":"Advanced security, support, and custom deployment options","contactSales":true}],"addOns":[{"name":"Additional Serverless/Dedicated Deployments"}],"summary":"Free Developer plan (5k traces). Plus plan $39/seat/month. Enterprise custom. Usage-based pricing for compute (LCU=$1.50) and storage (LSU=$1.00).","currency":"USD","freeTier":true,"sourceUrl":"https://www.langchain.com/pricing","retrievedAt":"2026-08-21T12:42:05.738Z","startingPrice":{"unit":"seat","amount":39,"period":"month","currency":"USD"},"billingPeriods":["month","year"]}` | `{"type":"open_source","freeTier":true,"sourceUrl":"https://docs.vllm.ai","retrievedAt":"2026-08-14T21:53:56.648Z"}` |
| pricing.free_tier | yes | yes |
| pricing.model | freemium | open_source |
| pricing.price_level | mid | free |
| pricing.starting_price | `{"amount":39,"currency":"USD"}` | - |
| pricing.transparent | yes | yes |
| release.cadence_days | - | 9 |
| release.history | `[{"url":"https://github.com/langchain-ai/langchain/releases/tag/langchain%3D%3D1.3.17","date":"2026-08-25T02:40:53Z","type":"stable","version":"langchain==1.3.17"},{"url":"https://github.com/langchain-ai/langchain/releases/tag/langchain-perplexity%3D%3D1.4.1","date":"2026-08-21T14:08:45Z","type":"stable","version":"langchain-perplexity==1.4.1"},{"url":"https://github.com/langchain-ai/langchain/releases/tag/langchain%3D%3D1.3.16","date":"2026-08-20T14:35:30Z","type":"stable","version":"langchain==1.3.16"},{"url":"https://github.com/langchain-ai/langchain/releases/tag/langchain-fireworks%3D%3D1.6.0","date":"2026-08-20T17:47:18Z","type":"stable","version":"langchain-fireworks==1.6.0"},{"url":"https://github.com/langchain-ai/langchain/releases/tag/langchain-anthropic%3D%3D1.6.1","date":"2026-08-20T14:06:49Z","type":"stable","version":"langchain-anthropic==1.6.1"},{"url":"https://github.com/langchain-ai/langchain/releases/tag/langchain-openai%3D%3D1.6.0","date":"2026-08-19T21:45:02Z","type":"stable","version":"langchain-openai==1.6.0"},{"url":"https://github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D1.6.0","date":"2026-08-19T15:55:57Z","type":"stable","version":"langchain-core==1.6.0"},{"url":"https://github.com/langchain-ai/langchain/releases/tag/langchain-anthropic%3D%3D1.6.0","date":"2026-08-19T21:39:54Z","type":"stable","version":"langchain-anthropic==1.6.0"},{"url":"https://github.com/langchain-ai/langchain/releases/tag/langchain-openai%3D%3D1.5.2a1","date":"2026-08-18T01:51:38Z","type":"stable","version":"langchain-openai==1.5.2a1"},{"url":"https://github.com/langchain-ai/langchain/releases/tag/langchain-openai%3D%3D1.5.2","date":"2026-08-18T17:38:11Z","type":"stable","version":"langchain-openai==1.5.2"},{"url":"https://github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D1.5.6","date":"2026-08-17T21:26:47Z","type":"stable","version":"langchain-core==1.5.6"},{"url":"https://github.com/langchain-ai/langchain/releases/tag/langchain-openrouter%3D%3D0.2.8","date":"2026-08-14T19:03:45Z","type":"stable","version":"langchain-openrouter==0.2.8"},{"url":"https://github.com/langchain-ai/langchain/releases/tag/langchain-openai%3D%3D1.5.1","date":"2026-08-14T15:47:44Z","type":"stable","version":"langchain-openai==1.5.1"},{"url":"https://github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D1.5.5","date":"2026-08-14T18:56:41Z","type":"stable","version":"langchain-core==1.5.5"},{"url":"https://github.com/langchain-ai/langchain/releases/tag/langchain-openai%3D%3D1.5.0","date":"2026-08-13T13:15:00Z","type":"stable","version":"langchain-openai==1.5.0"},{"url":"https://github.com/langchain-ai/langchain/releases/tag/langchain-anthropic%3D%3D1.5.6","date":"2026-08-13T02:31:03Z","type":"stable","version":"langchain-anthropic==1.5.6"},{"url":"https://github.com/langchain-ai/langchain/releases/tag/langchain%3D%3D1.3.15","date":"2026-08-11T19:11:09Z","type":"stable","version":"langchain==1.3.15"},{"url":"https://github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D1.5.4","date":"2026-08-11T18:03:10Z","type":"stable","version":"langchain-core==1.5.4"},{"url":"https://github.com/langchain-ai/langchain/releases/tag/langchain-anthropic%3D%3D1.5.5","date":"2026-08-11T19:16:55Z","type":"stable","version":"langchain-anthropic==1.5.5"},{"url":"https://github.com/langchain-ai/langchain/releases/tag/langchain-openai%3D%3D1.4.3","date":"2026-08-10T13:23:34Z","type":"stable","version":"langchain-openai==1.4.3"}]` | `[{"url":"https://github.com/vllm-project/vllm/releases/tag/v0.28.0","date":"2026-08-26T09:46:30Z","type":"stable","version":"v0.28.0"},{"url":"https://github.com/vllm-project/vllm/releases/tag/v0.27.1","date":"2026-08-11T10:47:49Z","type":"stable","version":"v0.27.1"},{"url":"https://github.com/vllm-project/vllm/releases/tag/v0.27.0","date":"2026-08-10T21:18:11Z","type":"stable","version":"v0.27.0"},{"url":"https://github.com/vllm-project/vllm/releases/tag/v0.26.0","date":"2026-07-27T01:06:58Z","type":"stable","version":"v0.26.0"},{"url":"https://github.com/vllm-project/vllm/releases/tag/v0.25.1","date":"2026-07-14T08:51:20Z","type":"stable","version":"v0.25.1"},{"url":"https://github.com/vllm-project/vllm/releases/tag/v0.25.0","date":"2026-07-11T20:06:44Z","type":"stable","version":"v0.25.0"},{"url":"https://github.com/vllm-project/vllm/releases/tag/v0.24.0","date":"2026-06-29T19:41:59Z","type":"stable","version":"v0.24.0"},{"url":"https://github.com/vllm-project/vllm/releases/tag/v0.23.0","date":"2026-06-15T05:27:20Z","type":"stable","version":"v0.23.0"},{"url":"https://github.com/vllm-project/vllm/releases/tag/v0.22.1","date":"2026-06-05T10:10:00Z","type":"stable","version":"v0.22.1"},{"url":"https://github.com/vllm-project/vllm/releases/tag/v0.22.0","date":"2026-05-29T10:28:13Z","type":"stable","version":"v0.22.0"},{"url":"https://github.com/vllm-project/vllm/releases/tag/v0.21.0","date":"2026-05-15T08:44:26Z","type":"stable","version":"v0.21.0"},{"url":"https://github.com/vllm-project/vllm/releases/tag/v0.20.2","date":"2026-05-10T07:37:57Z","type":"stable","version":"v0.20.2"},{"url":"https://github.com/vllm-project/vllm/releases/tag/v0.20.1","date":"2026-05-04T10:36:26Z","type":"stable","version":"v0.20.1"},{"url":"https://github.com/vllm-project/vllm/releases/tag/v0.20.0","date":"2026-04-27T21:20:28Z","type":"stable","version":"v0.20.0"},{"url":"https://github.com/vllm-project/vllm/releases/tag/v0.19.1","date":"2026-04-18T05:44:42Z","type":"stable","version":"v0.19.1"},{"url":"https://github.com/vllm-project/vllm/releases/tag/v0.19.0","date":"2026-04-03T02:19:12Z","type":"stable","version":"v0.19.0"},{"url":"https://github.com/vllm-project/vllm/releases/tag/v0.18.1","date":"2026-03-31T00:53:26Z","type":"stable","version":"v0.18.1"},{"url":"https://github.com/vllm-project/vllm/releases/tag/v0.18.0","date":"2026-03-20T21:31:36Z","type":"stable","version":"v0.18.0"},{"url":"https://github.com/vllm-project/vllm/releases/tag/v0.17.1","date":"2026-03-11T10:24:34Z","type":"stable","version":"v0.17.1"},{"url":"https://github.com/vllm-project/vllm/releases/tag/v0.17.0","date":"2026-03-07T00:46:41Z","type":"stable","version":"v0.17.0"}]` |
| reliability.sla_pct | 99.5 | - |
| reliability.status_page | yes | - |
| security.disclosure_policy | yes | - |
| security.gdpr | yes | - |
| security.hipaa | yes | - |
| security.iso27001 | yes | - |
| security.scorecard | 5.9 | - |
| security.soc2 | yes | - |
| security.vulnerabilities | `{"count":21,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=pypi&package_name=langchain&per_page=100","last_12m":2,"max_severity":"CRITICAL"}` | `{"count":62,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=pypi&package_name=vllm&per_page=100","last_12m":37,"max_severity":"CRITICAL"}` |

## Capabilities (MLOps & LLMOps Tools)

| Capability | LangChain | vLLM |
|---|:--:|:--:|
| **Core** |  |  |
| Tool role | LLM observability / eval | Model serving |
| **Deployment** |  |  |
| Self-hostable / OSS core | ✓ | ✓ |
| Managed cloud available | ✓ | ✗ |
| On-prem / VPC deployment | ✓ | ✓ |
| **Observability** |  |  |
| LLM tracing / observability | ✓ | ✓ |
| Evaluation (offline / LLM-judge / human) | ✓ | - |
| **Dev** |  |  |
| Prompt management + versioning | ✓ | - |
| **Tracking** |  |  |
| Experiment tracking / model registry | - | - |
| **Serving** |  |  |
| Model serving / inference endpoint | ✓ | ✓ |
| **Interop** |  |  |
| OpenTelemetry / OpenLLMetry compatible | ✓ | ✓ |
| Framework-agnostic | ✓ | ✓ |
| **Gateway** |  |  |
| Multi-provider model support | ✓ | ✓ |
| **Data** |  |  |
| No-train-on-customer-data guarantee | Unknown | - |

*Source: Vioscale. Generated 2026-09-01T17:26:36.817Z. "-" = undocumented, not absent.*