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Best LLM Gateways & Aggregators Tools
Single API/proxy across multiple model providers with routing, fallbacks, keys/billing unification, and basic observability.
LLM gateways and aggregators provide a single API layer that abstracts multiple large language model providers. They handle request routing, fallback mechanisms, unified billing, and basic observability, simplifying integration for developers and enterprises. Both open-source and commercial offerings exist, ranging from lightweight proxies to feature-rich SaaS platforms. These solutions enable organizations to switch providers, balance costs, and maintain consistent monitoring without rewriting application code.
Top Open Source LLM Gateways & Aggregators platforms
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- MIT
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Envoy AI Gateway
Unified gateway for secure, scalable generative AI traffic
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LiteLLM provides a single Python interface to call dozens of LLM providers—OpenAI, Azure, Anthropic, Bedrock, HuggingFace, and more—using the familiar OpenAI request/response format.
What to evaluate
01Integration Flexibility
Assess how easily the gateway connects to various model providers, supports custom adapters, and integrates with existing CI/CD pipelines.
02Routing and Fallback Capabilities
Evaluate the granularity of routing rules (e.g., by model, latency, cost) and the robustness of automatic fallback when a provider is unavailable.
03Cost and Billing Unification
Look for features that consolidate usage metering, support per-request cost tags, and provide unified invoicing across providers.
04Observability and Monitoring
Consider built-in logging, request tracing, latency dashboards, and export options to external monitoring tools.
05Security and Compliance
Check for API-key vaulting, role-based access control, data residency options, and compliance certifications relevant to your industry.
Common capabilities
Most tools in this category support these baseline capabilities.
- Unified REST/GraphQL API
- Provider-agnostic routing rules
- Automatic fallback to alternate models
- Per-request cost tagging
- Centralized API-key management
- Rate limiting and quota enforcement
- Request/response logging
- Latency and usage dashboards
- Streaming response support
- Plug-in architecture for custom adapters
- OpenAPI/Swagger documentation
- Multi-tenant isolation
- SLA and uptime monitoring
- Model version selection
Leading LLM Gateways & Aggregators SaaS platforms
Eden AI
Unified API aggregator for AI services across providers
LLM Gateways & Aggregators
Alternatives tracked
5 alternatives
OpenRouter
One API for 400+ AI models with smart routing and unified billing/BYOK
LLM Gateways & Aggregators
Alternatives tracked
5 alternatives
Vercel AI Gateway
Unified AI gateway for multi-provider routing, caching, rate limits, and observability
LLM Gateways & Aggregators
Alternatives tracked
5 alternatives
Most compared product
5 open-source alternatives
Eden AI offers a single API to multiple AI engines (vision, speech, NLP), selecting the best provider per task and price.
Leading hosted platforms
Frequently replaced when teams want private deployments and lower TCO.
Typical usage patterns
01Multi-Provider Orchestration
Applications send all LLM requests to the gateway, which selects the optimal provider based on predefined criteria such as cost or performance.
02Dynamic Routing for Cost Optimization
Routes are adjusted in real time to favor cheaper providers for low-risk prompts while reserving premium models for critical tasks.
03Failover and Redundancy
If a primary provider experiences downtime, the gateway automatically retries the request with a secondary provider to maintain service continuity.
04Centralized Billing Management
Teams consolidate usage across providers into a single dashboard, simplifying expense tracking and budget enforcement.
05A/B Testing of Model Versions
The gateway can split traffic between different model versions or providers, enabling data-driven evaluation of output quality.
Frequent questions
What is the primary benefit of using an LLM gateway?
It consolidates access to multiple model providers behind a single API, reducing integration complexity and enabling unified routing, cost control, and observability.
Can I route requests based on cost or latency?
Yes, most gateways allow rule-based routing that selects providers according to cost tags, latency thresholds, or custom business logic.
How does fallback work when a provider fails?
If a request to the primary provider returns an error or times out, the gateway can automatically retry the request with a secondary provider configured as a fallback.
Do gateways handle billing for all connected providers?
Many gateways aggregate usage metrics and expose cost tags, allowing a single billing view, though actual invoicing may still be performed by each provider.
Is it possible to use an open-source gateway in production?
Open-source projects like LiteLLM, Portkey AI Gateway, and Envoy AI Gateway are widely adopted in production environments, provided they meet your security and scalability requirements.
What observability features are typically included?
Gateways usually provide request logging, latency dashboards, usage analytics, and integrations with external monitoring tools such as Prometheus or Grafana.