# Sage-A1.5: From Long-Horizon Execution to Scientific Exploration with Capability Composition > Source: > Published: 2026-10-21 02:30:26+00:00 In this report, we introduce Sage-A1.5, a 35B Mixture-of-Experts agentic model that builds on A1 to advance long-horizon problem solving through adaptive capability composition. Compared with A1, Sage-A1.5 learns not only to solve individual tasks, but also to organize work and revise its approach d