ChatGPT 4o vs Claude Sonnet 4: which is better?
Quick answer: Use ChatGPT 4o for fast, conversational tasks. Use Claude Sonnet 4 for long-form writing, careful analysis and following nuanced instructions.
Both are flagship models from the two leading AI labs. They're closer in capability than benchmarks suggest, but they have genuinely different strengths:
- ChatGPT 4o — faster, more conversational, multimodal (image input). Best for: brainstorming, quick answers, casual writing, coding snippets, voice mode.
- Claude Sonnet 4 — slower but more careful, longer context window, more thoughtful tone. Best for: long-form articles, document analysis, nuanced instructions, sensitive topics, multi-file coding.
The honest take: if you only pick one, ChatGPT 4o is the better default for everyday questions. But for a serious writing project, Claude usually produces output that needs less editing. AskAI.free lets you ask both in the same conversation — try the same prompt in both and see which voice you prefer.
Try it for yourself — your first question is free, no signup needed.
Ask an AI →