LLM APIs & Gateways — Synthszr Charts

This category covers APIs and gateway services that give developers access to large language models or let them route requests to multiple models through a single interface. It includes direct provider APIs such as the Claude API, as well as routing and aggregation services like OpenRouter, LiteLLM, or Venice, which forward requests to different models based on cost, latency, or availability. They are used mainly by developer teams integrating AI features into their own applications without tying themselves to a single model provider.

The Synthszr Charts measure momentum for this category based on mentions across thousands of news and newsletter sources, recency-weighted so that recent developments count more than older ones. Ranking is version-granular, meaning individual API versions or model updates are tracked separately rather than lumped into a single product. The list is updated daily, showing which gateways and APIs are gaining or losing attention.