According to Satya Nadella on X (Twitter), Microsoft introduced a Rubber Duck agent that enables a multi-model reflection loop where GPT-5.5 can review the output of another model or vice versa. As reported by the embedded video post by Satya Nadella, this reviewer workflow supports cross-model critique and iteration, which can improve reliability for code reviews, data extraction, and enterprise copilots by catching errors and hallucinations before deployment. According to the post, the reflection loop positions GPT-5.5 as a meta-evaluator, creating opportunities for regulated industries to implement second-line assurance on AI outputs and for vendors to offer QA-as-a-service on top of existing LLM stacks.