Cloudflare AI Gateway
LLM gateway from Cloudflare that sits in front of any AI provider and adds request caching, cost analytics, rate limiting, and fallback routing. Zero-config for teams already on Cloudflare Workers. Free tier available on all Cloudflare plans.
OpenAI API
API access to GPT-5, GPT-5.5, o3/o4 reasoning models, and the Responses API; plus embeddings, image, audio, and Realtime endpoints. The most widely deployed LLM API in production.