# Anthropic ends flat-rate AI agent model for third-party frameworks - Date: 2026-04-06 - Category: Agentics A single autonomous agent running for a day can cost $1,000 to $5,000 at API rates, according to VentureBeat reporting on the economics. At 135,000 active OpenClaw instances, that is the scale Anthropic was managing under a flat-rate subscription model. That era ended April 4. ---