vioscale
Comparison

LangChain vs vLLM

On the evidence we track, LangChain leads this comparison with a composite score of 81/100. Scores are only directly comparable because these tools share a category; the full breakdown and every source is below.

LangChain full profile →vLLM full profile →
Machine formatsJSONMarkdownGraphQLor send Accept: application/json
★LangChain81
vLLM68
Score
Vioscale score
LangChain81 / 100medium · 70%
vLLM68 / 100medium · 67%
Pricing
Free tier
LangChain✓
vLLM✓
Model
LangChainfreemium
vLLMopen_source
Price level
LangChainmid
vLLMfree
Starting price
LangChain$39
vLLM–
Transparent
LangChain✓
vLLM✓
Integrations
Count
LangChain1,000
vLLM29
Security
Disclosure policy
LangChain✓
vLLM–
Gdpr
LangChain✓
vLLM–
Hipaa
LangChain✓
vLLM–
Iso27001
LangChain✓
vLLM–
Scorecard
LangChain5.9
vLLM–
Soc2
LangChain✓
vLLM–
Vulnerabilities
Reliability
Sla pct
LangChain99.5
vLLM–
Status page
LangChain✓
vLLM–
Adoption
Dependent repos
LangChain18,663
vLLM5
Github stars
LangChain145,063
vLLM90,137
Package downloads weekly
LangChain2,967,570
vLLM1,098,710
Activity
Commits last 30d
LangChain100
vLLM100
Release
Cadence days
LangChain–
vLLM9
History
LangChain20 items
vLLM20 items
License
Spdx
LangChainMIT
vLLMApache-2.0
Language
Primary
LangChainPython
vLLMPython
Market
Availability

Capabilities

Feature-by-feature on the axes that matter for mlops & llmops tools. “-” means undocumented, not absent.

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

What each one is

The product in its own terms, so the numbers below have context.

LangChain

Leader

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.

Independently observed

vLLM

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.

Independently observed

Pricing

List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.

LangChain

Leader
from $39/seat/moSubscriptionFree tier

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).

  • DeveloperFree
    • 1 free seat
    • 5k base traces/month
    • Tracing and analytics
    • Access to LangSmith platform
  • Plus$39/seat/month + usage (LCU/LSU), 10k traces included, 1 free small deployment
    • Unlimited seats
    • 10k base traces/month
    • 1 free small serverless deployment
    • Full tracing and analytics
    • Evaluation tools
  • EnterpriseContact sales
    • Advanced administration
    • Dedicated support
    • Custom deployments
    • White-glove onboarding
    • Proactive monitoring
    • +1 more
as of verify ↗

vLLM

Open sourceFree tier
as of verify ↗

Platform & deployment

Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.

Platforms
Web
LangChain✓
vLLM✗
Linux
LangChain✗
vLLM✓
CLI
LangChain✗
vLLM✓
Deployment
Cloud / SaaS
LangChain✓
vLLM✓
Self-hosted
LangChain✓
vLLM✓
On-premise
LangChain✗
vLLM✓
Hybrid
LangChain✓
vLLM✗

Integrations

What each product connects to. Counts come from the vendor's own integration directory where one exists.

LangChain

Leader
9 total
  • OpenAI
  • Anthropic
  • Cohere
  • Google
  • Azure OpenAI
  • Azure AI Search
  • Microsoft Fabric
  • Azure Kubernetes Service
  • OpaquePrompts
Independently observed

vLLM

32 total
  • Hugging Face
  • NVIDIA Dynamo
  • OpenAI-compatible API
  • Anthropic Messages API
  • FlashAttention
  • FlashInfer
  • CUTLASS
  • torch.compile
  • gRPC
  • GPTQ
  • AWQ
  • GGUF
  • ModelOpt
  • TorchAO
  • OpenAI API
  • Kubernetes
  • PyTorch
  • Ray
  • OpenTelemetry
  • Prometheus
  • FastAPI
  • Transformers
  • Outlines
  • Google Cloud TPU
  • +8 more
Independently observed

Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.