Rubber Duck Now Works With Any Model Family On May 7, GitHub expanded Rubber Duck — the cross-family review agent I covered when it launched last month — to work bidirectionally across model families. When Rubber Duck first shipped in experimental mode, it was Claude-only: pick a Claude model as your orchestrator, and Rubber Duck would dispatch GPT-5.4 to review the work. That closed 74.7% of the performance gap between Sonnet and Opus on hard multi-file problems. The May 7 changelog flips the script: if you're using a GPT model as your orchestrator, Rubber Duck now dispatches a Claude-powered critic . The same architectural review, subtle bug catching, and cross-file conflict detection now applies to GPT-driven sessions. For Claude sessions, the update upgrades the reviewer model to GPT-5.5 (previously GPT-5.4), bringing a stronger second opinion to the table.…