LLM Providers & Gateways
Where an AI system's reasoning actually happens. This covers first-party model APIs, the gateways that put many models behind one interface, and local runtimes for open models — the layer you swap when cost, latency, or privacy needs change.
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Foundation Model APIs
First-party APIs for frontier models
Anthropic Claude
Anthropic
Frontier LLM API with strong tool-use and long-context reasoning, ideal as an agent's core model
Google Gemini
Google's Gemini models via the AI Studio API — long context, multimodal, with a free tier
Mistral AI
Mistral AI
European model lab with strong open-weight models and a hosted API (La Plateforme)
OpenAI
OpenAI
OpenAI's GPT models via the API — function calling, structured outputs, and the de-facto API shape
Gateways & Routers
One interface that unifies many providers
LiteLLM
BerriAI
Call 100+ LLM APIs through one OpenAI-style interface, plus a proxy with routing, fallbacks, and cost tracking.
OpenRouter
OpenRouter
One OpenAI-compatible API to 300+ models across providers, with routing and fallbacks
Local Models
Run open models on your own hardware.
LM Studio
LM Studio
Desktop app to discover, run, and serve local LLMs with an OpenAI-compatible server
Ollama
Ollama
Run open LLMs locally with one command — an OpenAI-compatible API for offline, private agents.
vLLM
PyTorch Foundation
High-throughput serving engine for running open LLMs with an OpenAI-compatible API