AI gateway alternatives

Every major AI gateway alternative, compared in 2026

13 options — OpenRouter, Portkey, Helicone, LiteLLM, Together, Fireworks, Braintrust, LangSmith, Vellum, Traceloop, Langfuse, Anyscale, Requesty. Each page: fact-sheet, feature comparison, 5-minute migration, 6 FAQs, and 4 other alternatives.

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#1LLM router

OpenRouter alternative

Text-LLM aggregator with ~300 model routes.

Closed source · ~300 text-only models.
Why AIgateway beats OpenRouter
#2Governance gateway

Portkey alternative

LLM gateway-as-a-service focused on governance and observability.

Partially OSS · ~40 models, mostly text + some image.
Why AIgateway beats Portkey
#3Observability proxy

Helicone alternative

LLM observability proxy — strong at logging, not a routing layer.

Open source · Pass-through proxy — whatever providers you wire up.
Why AIgateway beats Helicone
#4LLM router

Requesty alternative

Cost-aware text-LLM router.

Closed source · ~50 text models.
Why AIgateway beats Requesty
#5Eval platform

Braintrust alternative

AI evaluation platform with a proxied inference layer.

Partially OSS · Proxies upstream providers; no first-party multi-modal catalog.
Why AIgateway beats Braintrust
#6OSS SDK + proxy

LiteLLM alternative

Open-source SDK and self-hosted proxy for routing between providers.

Open source · 100+ models via community adapters.
Why AIgateway beats LiteLLM
#7Observability + evals

LangSmith alternative

LangChain's observability and eval platform.

Closed source · None — observes upstream providers.
Why AIgateway beats LangSmith
#8Prompt ops

Vellum alternative

Prompt engineering and workflow platform for production AI.

Closed source · Proxies upstream providers for execution.
Why AIgateway beats Vellum
#9OTel observability

Traceloop alternative

OpenLLMetry-based observability for LLM apps.

Open source · None — observes upstream calls.
Why AIgateway beats Traceloop
#10OSS observability

Langfuse alternative

Open-source LLM observability, evals, and prompt management.

Open source · None — observes upstream calls.
Why AIgateway beats Langfuse
#11Managed OSS inference

Anyscale alternative

Managed Ray-based inference and fine-tuning platform.

Partially OSS · Open-source models served on Anyscale compute.
Why AIgateway beats Anyscale
#12OSS inference

Together AI alternative

Hosted open-source inference platform.

Closed source · ~80 open-source models; no Anthropic/OpenAI frontier.
Why AIgateway beats Together AI
#13OSS inference

Fireworks AI alternative

Fast open-source inference platform with image and video.

Closed source · Open-source LLMs + image/video; no frontier text.
Why AIgateway beats Fireworks AI
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