Replika

Replika is primarily a conversational AI companion, directly aligning with the 'conversational-ai' feature. While it doesn't explicitly offer an API for developers to build on, its core functionality is an AI chatbot, and it mentions learning and adapting to the user, which implies a form of 'fine-tuning-and-custom-models' for individual users. The website also mentions video calls and AR experiences, suggesting 'multimodal-ai' capabilities beyond just text. However, it lacks clear indications of enterprise solutions, explicit safety frameworks for external deployment, or broad API access for third-party development as described in the OpenAI Platform concept.