Feature
OpenAI-Compatible API
Drop-in compatibility with the OpenAI request shape.
21 providers
115 APIs
18 declared variants
The endpoint mirrors the OpenAI API surface, so existing clients and frameworks work by changing a base URL. Removes almost all switching cost between model providers.
21 API providers on the APIs.io network offer openai-compatible api. The highest-rated are Vapi, NVIDIA NIM, Cloudflare, Hyperbolic, AIMLAPI.
Providers
Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.
Exemplar 2 Complete, well-documented, and agent-ready
Strong 5 Solid coverage with minor gaps
CloudflareCloudflare is a global network designed to make everything you connect to the Internet secure, private, fas...HyperbolicHyperbolic is an open-access AI cloud and decentralized GPU marketplace serving 200,000+ builders with affo...AIMLAPIAIMLAPI is a unified AI model API gateway providing access to 400+ state-of-the-art AI models from OpenAI, ...Arcade.devArcade.dev (formerly Arcade AI) is the MCP runtime for production AI agents — a platform that lets agents s...PerplexityPerplexity AI is an answer engine that delivers accurate answers to complex questions using large language ...
Developing 4 Usable, with meaningful gaps to close
Mistral AIMistral AI provides state-of-the-art large language models and AI APIs for developers and enterprises.ParasailParasail is an AI Supercloud — a pay-per-token GPU inference platform aimed at AI startups and developers. ...BifrostBifrost is a high-performance open-source AI gateway that unifies access to 20+ AI providers through a sing...OpenRouterOpenRouter is an API platform that provides unified access to multiple AI language models through a single ...
Thin 6 Limited public surface area
LangflowLangflow is an open-source low-code visual builder for AI agents, RAG pipelines, and LangChain-based workfl...AI GatewayAn API Evangelist landscape index of AI gateways — the LLM routers, prompt firewalls, model fallback proxie...ACI.devACI.dev (Aipolabs Agent-Computer Interface) is an open-source tool-calling platform that hooks AI agents in...io.netio.net is a decentralized GPU network for AI compute, built on Solana, that aggregates idle consumer and da...cohereGenerates a text response to a user message and streams it down, token by token.GlamaGlama is an all-in-one AI workspace combining an MCP server marketplace and registry, a managed MCP gateway...
Emerging 3 Early or largely undocumented
Apache JcloudsApache jclouds is an open-source multi-cloud toolkit for the Java platform that provides a portable abstrac...AutoGen StudioAutoGen Studio is a low-code / no-code developer GUI from Microsoft Research for rapidly prototyping, compo...Refact.aiRefact.ai is an open-source, local-first AI coding assistant and autonomous software-engineering agent buil...
Minimal 1 Almost no public developer surface
What Providers Actually Declared
This feature is a canonical term. These are the free-text strings
providers wrote in their own apis.yml that map onto it.
Bring-your-own model — any OpenAI-compatible endpoint (OpenAI, Azure OpenAI, Anthropic, vLLM, Ollama, local models) via declarative `model_client` config; AutoGen Extensions provides first-party clientsChats API (text channel) and OpenAI-compatible /chat/responsesIO Intelligence — OpenAI-compatible inference API for 15+ open-source models including Llama 3.3 70BLocal model providers — Ollama, LM Studio, vLLM, custom OpenAI-compatible endpointsOpenAI-Compatible APIOpenAI-Compatible InferenceOpenAI-compatible /v1/chat/completions, /v1/completions, /v1/embeddings, /v1/modelsOpenAI-compatible AI gateway at `https://gateway.glama.ai/v1`OpenAI-compatible Chat CompletionsOpenAI-compatible Chat Completions APIOpenAI-compatible Chat Completions endpointOpenAI-compatible REST API at https://api.hyperbolic.xyz/v1 — drop-in replacement requiring only api_key and base_url changesOpenAI-compatible REST surface — /v1/chat/completions, /v1/completions, /v1/embeddings, /v1/models, /v1/rankingOpenAI-compatible Responses endpoint (/api/v1/responses) so OpenAI clients can target a Langflow flowOpenAI-compatible and Anthropic-compatible function-definition output formatsOpenAI-compatible chat completions endpoint with attached toolsProvider AbstractionWorkers AI catalog of 78+ open-source models with OpenAI-compatible endpoints
Scroll for all 18
Work with this as data
Every feature here is available over the APIs.io API and to AI agents over MCP. Features is not yet its own endpoint on the v1 API. Reach it through catalog search and the tag graph, or the MCP server.