OpenRouter Fusion API

OpenRouter Fusion API is a new service that lets developers send a single API request to multiple large language models simultaneously and receive a combined, merged response. It solves the problem of having to manage separate API calls and integrations for different LLM providers, reducing latency and complexity. The API supports models from OpenAI, Anthropic, Google, and others, and allows users to define custom strategies for how outputs are merged, such as taking the best response or combining them. Based on community signals so far, it appears to be a fresh launch from OpenRouter, a known provider of LLM routing services. The evidence includes a direct link to the official OpenRouter Fusion page, indicating it is a real, available product. This tool is particularly useful for developers building applications that require high reliability, cost optimization, or diverse model capabilities without vendor lock-in.

The term appeared on Hacker News with a direct link to the official OpenRouter Fusion API launch page, indicating a fresh product release with high commercial intent.