As per the last update in September 2021, ChatGPT (GPT-3.5) possesses several key features and capabilities that make it a powerful language model for various applications. Some of the notable features include:

1. Natural Language Understanding: ChatGPT has a strong ability to understand and interpret human language. It can comprehend context, grammar, and semantics, allowing for coherent and contextually relevant responses.
2. Context Maintenance: ChatGPT can maintain context during conversations. It considers previous messages in a conversation, allowing for interactive and multi-turn dialogues with the model.
3. Generative Responses: The model generates responses in a creative and free-form manner. It can produce new text based on the input prompts rather than providing predefined answers from a fixed database.
4. Multilingual Support: ChatGPT can understand and generate text in multiple languages. It has been trained on a diverse dataset containing content from various languages.
5. Text Completion and Suggestion: ChatGPT can provide text completion suggestions when given partial sentences or prompts. It can assist with content writing and brainstorming ideas.
6. Answering Questions: Users can ask ChatGPT questions, and the model attempts to generate relevant answers based on its knowledge from pre-training.
7. Programming Help: ChatGPT can be used to assist with coding and programming tasks. Users can ask for code snippets or explanations related to programming problems.
8. Creative Writing: ChatGPT can generate creative pieces of writing, including stories, poems, and fictional narratives.
9. Language Translation: While not a dedicated translation tool, ChatGPT can offer assistance in translating sentences or phrases between languages.
10. Paraphrasing and Rewriting: ChatGPT can help rephrase sentences or paragraphs, making it useful for content editing and paraphrasing tasks.
11. Text-Based Games: Users can play text-based games with ChatGPT, such as storytelling adventures or interactive fiction.
12. Educational Support: ChatGPT can provide explanations and answers to academic questions, making it a helpful tool for learning and research.

It’s important to note that while ChatGPT has impressive capabilities, it also has limitations. It may produce plausible-sounding but incorrect or nonsensical responses. Additionally, it might exhibit biases present in its training data, and users should be cautious about relying on it for critical or sensitive information.

As the AI field continues to advance, newer versions of language models and additional features may become available. For the most up-to-date information on ChatGPT’s features and capabilities, it’s best to refer to official sources and documentation from OpenAI.