# Haystack vs vLLM

| Attribute | Haystack | vLLM |
|---|---|---|
| **Vioscale score** | 64.9 (62% (medium)) | 67.6 (67% (medium)) |
| activity.commits_last_30d | 100 | 100 |
| adoption.dependent_repos | 237 | 5 |
| adoption.github_stars | 26,323 | 90,137 |
| adoption.package_downloads_weekly | 199,336 | 1,098,710 |
| deployment.options | `{"cloud":true,"hybrid":true,"on_prem":true,"self_hosted":true}` | `{"cloud":true,"on_prem":true,"self_hosted":true}` |
| description.long | A Python-based orchestration tool for creating and deploying intelligent applications powered by language models. Developers assemble reusable components (data retrieval, model integration, tool execution) into customizable workflows, from question-answering systems to multi-step autonomous agents, deployable on private infrastructure or in the cloud. | 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":"platform","evaluation":true,"managed_cloud":true,"model_serving":true,"pricing_model":"free_open_source","self_hostable":true,"multi_provider":true,"vpc_deployment":true,"otel_compatible":true,"no_train_on_data":"unknown","llm_observability":true,"prompt_management":true,"framework_agnostic":true,"architecture_paradigm":"graph_based_cycles","native_observability_and_trace_logging":true,"native_memory_and_state_persistence_layer":true,"tool_calling_and_function_schema_validation":true,"managed_cloud_runtime_infrastructure_offered":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 | 14 | 29 |
| integrations.list | `[{"name":"OpenAI"},{"name":"Anthropic"},{"name":"Mistral"},{"name":"Hugging Face"},{"name":"Weaviate"},{"name":"Pinecone"},{"name":"Elasticsearch"},{"name":"AstraDB"},{"name":"Apify"},{"name":"ReadMe"},{"name":"Azure OpenAI"},{"name":"Datadog"},{"name":"OpenTelemetry"},{"name":"SerperDev"},{"name":"SearchApi"},{"name":"Cohere"},{"name":"AWS Bedrock"},{"name":"FAISS"},{"name":"AWS SageMaker"},{"name":"OpenSearch"},{"name":"Google Colab"},{"name":"MCP servers"}]` | `[{"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 | Apache-2.0 | Apache-2.0 |
| market.availability | `{"primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | `{"primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"web":true}` | `{"cli":true,"linux":true}` |
| pricing | `{"type":"hybrid","plans":[{"free":true,"name":"Open Source","description":"Free open-source framework with community support","contactSales":false},{"free":false,"name":"Enterprise Starter","description":"Consulting, secure design guidance, and deployment blueprints for production use","contactSales":true},{"free":false,"name":"Enterprise Platform","description":"Managed cloud or self-hosted deployment with observability, governance, and team collaboration features","contactSales":true}],"summary":"Free open-source core with commercial enterprise options","freeTier":true,"sourceUrl":"https://haystack.deepset.ai","retrievedAt":"2026-08-21T12:45:10.798Z"}` | `{"type":"open_source","freeTier":true,"sourceUrl":"https://docs.vllm.ai","retrievedAt":"2026-08-14T21:53:56.648Z"}` |
| pricing.free_tier | yes | yes |
| pricing.model | commercial | open_source |
| pricing.price_level | low | free |
| pricing.transparent | no | yes |
| release.cadence_days | 1 | 9 |
| release.history | `[{"url":"https://github.com/deepset-ai/haystack/releases/tag/v3.1.0","date":"2026-08-24T15:19:09Z","type":"stable","version":"v3.1.0"},{"url":"https://github.com/deepset-ai/haystack/releases/tag/v3.1.0-rc3","date":"2026-08-21T15:31:26Z","type":"prerelease","version":"v3.1.0-rc3"},{"url":"https://github.com/deepset-ai/haystack/releases/tag/v3.1.0-rc2","date":"2026-08-21T14:30:15Z","type":"prerelease","version":"v3.1.0-rc2"},{"url":"https://github.com/deepset-ai/haystack/releases/tag/v3.1.0-rc1","date":"2026-08-18T09:09:17Z","type":"prerelease","version":"v3.1.0-rc1"},{"url":"https://github.com/deepset-ai/haystack/releases/tag/v3.0.0","date":"2026-07-20T12:07:08Z","type":"stable","version":"v3.0.0"},{"url":"https://github.com/deepset-ai/haystack/releases/tag/v3.0.0-rc1","date":"2026-07-20T09:04:49Z","type":"prerelease","version":"v3.0.0-rc1"},{"url":"https://github.com/deepset-ai/haystack/releases/tag/v2.31.0","date":"2026-07-08T11:34:43Z","type":"stable","version":"v2.31.0"},{"url":"https://github.com/deepset-ai/haystack/releases/tag/v2.31.0-rc2","date":"2026-07-07T08:18:58Z","type":"prerelease","version":"v2.31.0-rc2"},{"url":"https://github.com/deepset-ai/haystack/releases/tag/v2.31.0-rc1","date":"2026-07-07T06:24:07Z","type":"prerelease","version":"v2.31.0-rc1"},{"url":"https://github.com/deepset-ai/haystack/releases/tag/v2.30.2","date":"2026-06-18T08:36:45Z","type":"stable","version":"v2.30.2"},{"url":"https://github.com/deepset-ai/haystack/releases/tag/v2.30.2-rc1","date":"2026-06-17T14:32:06Z","type":"prerelease","version":"v2.30.2-rc1"},{"url":"https://github.com/deepset-ai/haystack/releases/tag/v2.30.1","date":"2026-06-09T13:26:29Z","type":"stable","version":"v2.30.1"},{"url":"https://github.com/deepset-ai/haystack/releases/tag/v2.30.1-rc1","date":"2026-06-09T12:45:47Z","type":"prerelease","version":"v2.30.1-rc1"},{"url":"https://github.com/deepset-ai/haystack/releases/tag/v2.30.0","date":"2026-06-03T10:21:07Z","type":"stable","version":"v2.30.0"},{"url":"https://github.com/deepset-ai/haystack/releases/tag/v2.30.0-rc1","date":"2026-06-02T12:23:29Z","type":"prerelease","version":"v2.30.0-rc1"},{"url":"https://github.com/deepset-ai/haystack/releases/tag/v2.29.0","date":"2026-05-12T14:25:16Z","type":"stable","version":"v2.29.0"},{"url":"https://github.com/deepset-ai/haystack/releases/tag/v2.29.0-rc2","date":"2026-05-12T13:08:33Z","type":"prerelease","version":"v2.29.0-rc2"},{"url":"https://github.com/deepset-ai/haystack/releases/tag/v2.29.0-rc1","date":"2026-05-11T14:37:25Z","type":"prerelease","version":"v2.29.0-rc1"},{"url":"https://github.com/deepset-ai/haystack/releases/tag/v2.28.0","date":"2026-04-20T15:02:05Z","type":"stable","version":"v2.28.0"},{"url":"https://github.com/deepset-ai/haystack/releases/tag/v2.28.0-rc2","date":"2026-04-20T13:11:05Z","type":"prerelease","version":"v2.28.0-rc2"}]` | `[{"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"}]` |
| security.scorecard | 9.4 | - |
| security.vulnerabilities | `{"count":1,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=pypi&package_name=farm-haystack&per_page=100","last_12m":0,"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 | Haystack | vLLM |
|---|:--:|:--:|
| **Core** |  |  |
| Tool role | End-to-end ML platform | 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 2026-09-01T16:56:36.672Z. "-" = undocumented, not absent.*