One API Key, 800+ Models: The Unified AI API for Developers

The Hidden Cost of Multi-Provider Code

The moment your app needs more than one model, complexity explodes. OpenAI's SDK, Anthropic's SDK, and Google's SDK each have different message formats, auth schemes, streaming protocols, error shapes, and rate limits. You end up writing adapter layers, juggling four API keys in your secrets manager, and reconciling four invoices at month-end. When a better model ships, migrating means touching code in a dozen places.

A unified AI API collapses all of that into one interface. Vincony exposes 800+ models from 80+ providers through a single endpoint and a single key, with one billing account and one set of usage analytics.

Swap Any Model by Changing One String

Your code stays identical across every provider — only the model argument changes:

import vincony

client = vincony.Client(api_key="YOUR_KEY")  # one key, every provider

# Same call shape, whatever the underlying provider is:
for model in ["gpt-5", "claude-opus-4.5", "gemini-2.5-pro", "deepseek-v3"]:
    res = client.chat(
        model=model,
        messages=[{"role": "user", "content": "Write a Python LRU cache decorator."}],
    )
    print(model, "->", res.text[:80])

Full request/response details, streaming, tool-calling, and SDK references live in the developer API docs.

Streaming, Tools, and Failover Built In

Because the interface is uniform, cross-cutting features work everywhere at once. Stream tokens from any model, attach the same tool definitions regardless of provider, and configure automatic failover so a provider outage transparently retries on the next-best model:

stream = client.chat(
    model="gpt-5",
    messages=[{"role": "user", "content": "Explain async/await in JS."}],
    stream=True,
    fallback=["claude-sonnet-4.6", "gemini-2.5-flash"],  # auto-retry on failure
)

for chunk in stream:
    print(chunk.delta, end="", flush=True)

Use Your Own Provider Keys (BYOK)

Already have OpenAI or Anthropic credits? With Bring Your Own Key you keep the unified interface and observability but bill usage straight to your own provider account, with zero platform markup. You get the developer ergonomics without changing who you pay.

Spin up a key on the free tier — 100 credits, no card required — and make your first unified call in minutes: start free on Vincony.