One API, All Major Models —
RelayLLM
Unified access to Claude, GPT and more. Support for OpenAI Chat Completions, Responses, and Anthropic Messages formats with low-latency routing.
forum TG Channel chat_bubble_outline$ curl https://api.relayllm.cc/v1/messages \
-H "x-api-key: $RELAYLLM_API_KEY" \
-H "anthropic-version: 2023-06-01" \
-H "Content-Type: application/json" \
-d '{
"model": "claude-opus-5.5",
"max_tokens": 1024,
"messages": [
{"role": "user", "content": "Hello"}
]
}'Get Started in Three Steps
No changes to your business logic. Integrate in minutes.
Create an Account
Sign up with an email code or your Google account. No credit card required.
Top Up and Create a Key
Add balance in the dashboard, then create one API key that works with every model.
Change the Base URL
Point your SDK or tool at RelayLLM and keep the rest of your code as it is.
- base_url="https://api.openai.com/v1" + base_url="https://api.relayllm.cc/v1"
Enterprise Infrastructure for Developers
Built by developers for developers. We handle the complexity of model routing so you can focus on building.
Unified Relay Engine
Our high-performance proxy layer translates between major model providers in real-time, compatible with OpenAI and Anthropic API formats.
Global Privacy
We do not store prompts or responses, only billing data such as model and token usage. All traffic is encrypted in transit with TLS.
Smart Observability
Detailed logging, token usage tracking, and cost analysis dashboards available out of the box.
Mainstream Flagship Models Supported
Immediate access to the latest model releases from OpenAI and Anthropic. Switch providers with a single line change.
FAQ
Start Now: One Key for Mainstream Models
Create an API key right after signing up. Pay as you go, no monthly fee.