Relace builds the infrastructure foundation for AI coding agents, providing specialized models that let agents store, search and modify production codebases reliably and fast. Its stack includes an Instant Apply model that merges AI-generated code at up to 10,000 tokens per second, embedding models for retrieval across massive codebases, and a Code Reranker that filters multiple AI outputs to pick the most accurate. Already in production with companies like Lovable, Magic Patterns, Codebuff and Tempo Labs, Relace targets the auxiliary-model layer beneath autonomous coding. Backed by Y Combinator since 2023, the company raised a $23M Series A in October 2025 led by Andreessen Horowitz, with participation from Matrix Partners.