API PROTOCOLS

OpenAI-compatible API routes: auth, suppliers, and next actions

This is the most practical protocol route for real integration demand. Many procurement and developer decisions collapse into one question: can it plug in like OpenAI? This page puts auth, endpoint shape, suppliers, and sample models on one decision surface.

Global + China mixed routeOpenAI-compatible API14 providers

OpenAI-compatible API routes

This is the most practical protocol route for real integration demand. Many procurement and developer decisions collapse into one question: can it plug in like OpenAI?

AUTH

Bearer token / Authorization

ENDPOINT SHAPE

/v1/models + /v1/chat/completions

STREAM

Most providers support stream / SSE

Protocol shape

OpenAI-compatible API

Understand the protocol shape first, then decide whether the route deserves deeper testing.

Auth style

Bearer token / Authorization

Integration cost often shows up in auth and SDK compatibility, not in the model itself.

Tracked providers

14 of them can move straight into live checking.

Sample models

These routes also surface representative models so the page does not stop at abstraction.

PROTOCOL JUDGMENT

This is the most practical protocol route for real integration demand. Many procurement and developer decisions collapse into one question: can it plug in like OpenAI? This route currently tracks 14 suppliers, led by OpenAI, xAI, Mistral AI, DeepSeek. It is less about naming APIs and more about answering which integration path you should actually use.

Protocol pages sit closer to real implementation than generic provider pages because they surface auth, base URL shape, model-list endpoints, and stream readiness in one place. That lets people judge integration cost before moving into pricing, alternatives, or key checks.

If TestKey wants to translate traffic into action, these pages matter. Many visitors search the protocol name or compatibility mode before they search a provider brand.

BEST FOR

Teams already using OpenAI SDKs that want cheaper or fresher supply routes.

Marketplaces, resellers, and unified gateways that do not want to rewrite protocol glue for every provider.

Anyone who needs to know whether a key can drop into an existing client with minimal friction.

DATASET NOTE

Protocol routes are organized from the 2026-04-21 supplier catalog, representative models, base URLs, and checker coverage. They are here to help with integration judgment first, not replace official docs.

SUPPLIERS ON THIS ROUTE