OpenAI-compatible API
RouterBase is a drop-in replacement for the OpenAI SDK. Change one line to route to 200+ models.
State-of-the-art reasoning in a single request
Loading model information...
Input
Claude Opus 5
Hi! I'm a helpful AI assistant. What can I do for you?
Claude Opus 5
Anthropic Claude Opus 5 via RouterBase. Fifth-generation Opus flagship for agentic coding and long-horizon work; 1M-token context, 128K max output, prompt caching, OpenAI-compatible chat completions.
Why RouterBase
Everything you need to ship with LLMs
Everything you'd otherwise build in-house, bundled behind one API.
200+ models, one key
RouterBase covers OpenAI, Anthropic, Google, Meta, Mistral, DeepSeek, xAI — always up-to-date.
Smart routing
Auto-select the best provider by price, latency or availability — per request.
Automatic fallback
Switch providers in milliseconds when the primary fails. Zero downtime.
Unified billing
One invoice across all providers. No juggling a dozen platform accounts.
Usage analytics
Track spend by model, key or project. Export to CSV or query via API.
Using RouterBase
Get started with RouterBase in 3 steps
From sign-up to your first response in under 5 minutes.
- 01
Create an API key
Sign up and generate an sk-rb-… key from the dashboard.
- 02
Point your SDK at RouterBase
The OpenAI SDK works as-is — just swap the base URL.
- 03
Call any model
Pick from 200+ models across OpenAI, Anthropic, Google and more.
Pay only for what you use
RouterBase passes through partner-tier pricing. Compared against the model's official published API rate.
Customer stories
What developers say about RouterBase
One API for every frontier model. Here's why teams ship on RouterBase.
RouterBase cut our model ops from juggling 5 SDKs to one. We shipped twice as fast and our Q3 bill dropped 38%.
We swapped three providers through RouterBase in one line of code when OpenAI had its outage. Our users never noticed.
RouterBase's smart routing shaved 30% off our p95 latency — same prompts, better provider auto-picked per request.
RouterBase's unified billing alone was worth it. No more chasing six platform invoices at quarter-end.
OpenAI SDK + a base URL swap = RouterBase. The whole integration took me less than writing this testimonial.
RouterBase puts 200+ models behind one key. Our research team stopped asking for new provider accounts.
RouterBase fallback from Claude to Gemini fires in under 200ms. For our chatbot SLA, it's non-negotiable.
We migrated 42 services to RouterBase over a weekend. The only PR comment we got was 'wait, that's all?'.
Through RouterBase we pay 20–30% less than hitting providers directly. The platform fee is transparent.
Frequently Asked Questions
RouterBase is a unified router for 200+ frontier AI models — chat from OpenAI, Anthropic, Google, Meta, Mistral, DeepSeek and xAI, plus image, video and audio from Flux, Ideogram, Veo and Kling. Smart routing, automatic fallback and unified billing are built in.