Cloze is an open-source web platform for conducting controlled, monitored studies of human-AI conversation in mental health research contexts. Consumer large language model (LLM) products such as ChatGPT, Claude, and Gemini are built for individual productivity, and offer researchers little experimental control, inconsistent data export, and no shared safety scaffolding that holds across providers. Cloze gives research teams a single environment in which they configure which models participants converse with, how the AI is instructed, how conversations are scheduled over time, and which safety constraints apply unconditionally, while every message is captured with full provenance (model version, prompt configuration, timing). The platform currently supports OpenAI, Anthropic, Google, and locally hosted open-weight models served through Ollama behind a unified interface, and runs in the cloud or fully on premises so that participant data need never leave an institution. Cloze is research infrastructure for building an evidence base on human-AI interaction in mental health contexts. It is not a therapeutic product.

翻译：Cloze是一个开源Web平台，用于在心理健康研究场景中开展受控、可监测的人机对话实验。面向消费者的通用大语言模型（LLM）产品（如ChatGPT、Claude和Gemini）以提升个人生产力为目标，为研究者提供的实验控制能力有限，数据导出缺乏一致性，且缺乏跨服务商通用的共享安全保障框架。Cloze为研究团队提供统一环境，可配置参与者交互的模型、人工智能的指令设定、对话的时间调度方案，以及无条件适用的安全约束条件，同时捕获每条消息的完整溯源信息（模型版本、提示配置、时间戳）。该平台当前支持OpenAI、Anthropic、Google及通过Ollama提供服务的本地部署开源权重模型，并支持云端或完全本地化部署，确保参与者数据无需离开所属机构。Cloze是构建心理健康领域人机交互循证基础的研究基础设施，而非治疗性产品。