What is Claude Sonnet 4 and how is it different from ChatGPT?
Quick answer: Claude Sonnet 4 is Anthropic's flagship Sonnet-tier model. It's known for careful, long-form writing, large context windows and a more cautious, thoughtful tone than ChatGPT.
Claude Sonnet 4 is Anthropic's most capable Sonnet-tier model. Anthropic builds Claude using Constitutional AI — a training approach focused on making the model helpful, honest and harmless — which produces a noticeably different feel from OpenAI's models.
Where Claude shines:
- Long documents — Claude has a large context window and can read entire reports, books or codebases in a single conversation.
- Long-form writing — essays, articles, fiction. Claude's prose has been called "more human" in side-by-side comparisons.
- Following nuanced instructions — Claude tends to actually do what you asked, not what it thinks you meant.
- Sensitive topics — more careful and less likely to go off the rails.
Where ChatGPT is stronger: raw speed, multimodal image input, voice mode, and a slightly more confident default tone.
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