The best model depends on what you are trying to do. The selector in Chatex AI lets you switch quickly, so it is normal to try more than one model for the same task.
Quick guide
GPT (powered by OpenAI) models: a strong default for everyday writing, coding, and general-purpose chat.
Claude (powered by Anthropic) models: often strong for long-form writing, summarization, and nuanced reasoning.
Gemini (powered by Google) models: useful for multimodal workflows, research, and longer-context tasks.
DeepSeek (powered by DeepSeek), Qwen (powered by Alibaba), Kimi (powered by Moonshot AI), Mistral (powered by Mistral AI), and Grok (powered by xAI): useful alternatives when you want a different reasoning style, faster replies, or a better fit for a specific prompt.
If the answer quality is off, try another model family before rewriting your whole prompt. Attachment support, audio input, and other multimodal features can also vary by model.