OpenAI compatible. Zero migration effort.

Swap your base URL, keep your existing code. EUrouter works with the OpenAI SDK, LangChain, LlamaIndex, and any OpenAI-compatible client out of the box.

One-line integration

Any OpenAI client

Single API key

Learn more

How OpenAI compatibility works

EUrouter implements the full OpenAI API specification. Point any compatible client at EUrouter and get instant access to every model we support, with no code changes beyond the base URL.

Drop-in replacement

Change your base_url and API key. That is the entire migration. Works with the OpenAI SDK, LangChain, LlamaIndex, and any client that speaks the OpenAI format.

Full API compatibility

Streaming, function calling, JSON mode, vision, and embeddings all work exactly as documented in the OpenAI specification. No wrapper libraries required.

Access every model

One API key gives you GPT, Claude, Mistral, Llama, Gemini, and more. No separate provider accounts, no juggling credentials.

Python / OpenAI SDK

# before
client = OpenAI(
  api_key="sk-..."
)

# after
client = OpenAI(
  base_url="https://api.eurouter.ai/api/v1",
  api_key="eur_..."
)

OpenAI SDK

LangChain

LlamaIndex

Drop-in replacement

Point any OpenAI-compatible client at EUrouter by changing the base URL. Your existing code, prompts, and integrations continue to work without modification.

Set base_url to https://api.eurouter.ai/api/v1
Use your EUrouter API key in place of your OpenAI key
Works with the official OpenAI Python and Node SDKs
Compatible with LangChain, LlamaIndex, Vercel AI SDK, and more

Full API compatibility

EUrouter implements the OpenAI API specification faithfully. Every feature you rely on works the same way, including streaming responses, tool use, structured output, and multimodal inputs.

Server-sent events for real-time streaming responses
Function calling and tool use with the same JSON schema
JSON mode for structured, parseable output
Vision support for image inputs alongside text

API compatibility checklist

Chat CompletionsSupported

Streaming (SSE)Supported

Function CallingSupported

JSON ModeSupported

Vision (Images)Supported

EmbeddingsSupported

Model ListingSupported

Error FormatSupported

Available through one API key

GPT-4o

OpenAI

Claude 4 Sonnet

Anthropic

Mistral Large

Mistral

Llama 4 Scout

Access every model

A single EUrouter API key unlocks models from every major provider. No need to create accounts with OpenAI, Anthropic, Google, or Mistral individually. Just pick a model and send your request.

100+ models from 10+ providers available instantly
Switch models by changing the model parameter in your request
No separate billing or credential management per provider
New models are added regularly with no integration changes needed

Integrate AI without GDPR risk.

You need AI that won’t create compliance headaches. Your data stays in the EU, GDPR is enforced by default, and every request is routed for the best balance of cost, latency, and uptime, reducing risk while improving performance.

Get Your API Key

GDPR by default

EU data residency

Smart routing