Surveying Services That Serve OSS Model APIs in a Japan Region — Comparing Them on Data Residency and Coding-Agent Practicality

Terminal-resident coding agents are now everyday tools, and provider-agnostic tools like OpenCode have spread widely. OpenCode Go is an attractive bundle that wraps OSS models for $10/month, but its regions are limited to the US, EU, and Singapore, with no Japan region. From both data residency and latency angles, this post reconciles inconsistent primary sources to map out the services that can serve OSS model APIs inside Japan.