Two AI APIs Shutting Down This Weekend: Perplexity Sonar and Appsmith AI

Developers have only days to migrate away from two major AI services. Perplexity is retiring its Sonar API on September 27, 2026, forcing a transition to its Agent API. This shift involves more than just a model swap; it requires updating endpoint paths, request structures, and adapting to a new cost model that includes per-tool-invocation billing. Meanwhile, Appsmith is discontinuing its managed Appsmith AI plugin on September 30, 2026. Users must migrate to self-managed datasources using their own API keys, as existing managed credentials will be revoked. The shutdown also impacts file-based context, which will not be transferred. Developers are urged to perform an immediate audit of their codebases to identify dependencies on these services, as the migration process involves significant architectural changes, particularly regarding data parsing and source attribution in Perplexity's new API.