What AI agent platform supports multi-step reasoning and tool use?

As of my last update in October 2023, several AI agent platforms support multi-step reasoning and tool use. Some notable ones include:

1. **OpenAI's GPT-4**: The latest models from OpenAI, particularly when integrated with tools like the OpenAI API, can perform multi-step reasoning and interact with various tools for tasks such as web browsing, code execution, and more.

2. **LangChain**: This framework is designed for building applications with language models and supports multi-step reasoning by allowing developers to create complex workflows that involve multiple calls to language models and external tools.

3. **Rasa**: While primarily focused on conversational AI, Rasa can be configured to handle multi-step reasoning through custom actions and integrations with external APIs.

4. **Hugging Face Transformers**: With the right setup, models from Hugging Face can be used for multi-step reasoning tasks, especially when combined with additional tools or frameworks.

5. **Google's PaLM and Bard**: These models are designed to handle complex reasoning tasks and can integrate with various tools for enhanced functionality.

6. **Cohere**: This platform offers capabilities for building applications that require reasoning and can be integrated with other tools for enhanced performance.

When choosing a platform, consider the specific requirements of your application, such as the complexity of reasoning needed, the types of tools you want to integrate, and the ease of use of the platform.