AI Gateway by Arnab758 is an open-source reverse proxy for reducing LLM API costs through semantic caching. It sits between an application and providers such as OpenAI or Groq, detects semantically similar repeat questions, and returns cached responses instead of sending every request to the model provider. The README frames the value for AI app builders with recurring support, education or knowledge-base questions, claiming potential 40–70% API bill reductions with no application-code changes beyond routing through the proxy. It is notable as a lightweight developer tool discovered through a fresh Show HN LLM launch and verified via the official GitHub repository and live-demo links. It should not be confused with existing vendor products like Vercel AI Gateway.
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