Multi-Model Relay
User input"go to LV 00003 and Approve it"
The leave application LV 00003 was created by a human (Bob Wilson). Claude Opus 4.5 advanced it to Submitted with confidence 95. GPT-5.5 Thinking approved it with confidence 98. Each transition produced an identical history event shape, with the same fields, the same audit format, and the same governance.
Actor Parity across model families. Model portability. Unified audit substrate.
The harness operates the same on Claude and GPT-5.5 with no code change. Models are interchangeable; the audit and governance are not.