Ax is a local tool that enables Claude, Codex, and OpenCode to communicate with each other. The example demonstrates building a signup feature through coordinated message exchanges between components to define fields, validation rules, and error handling.
OpenCode Go user reports a billing discrepancy where $0.35 in API usage consumed 11% of their $12 five-hour quota, suggesting a potential billing or quota calculation error. The user indicates that usage transparency features were removed after reporting the bug.