Claude Sonnet 3.7 has been retired.
We recommend switching to Claude Sonnet 4.6 for the best experience.
Chat with Claude Sonnet 3.7
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Explain a conceptClear, detailed answer
Compare two thingsPros, cons & verdict
A balanced Anthropic model with most of Sonnet 4's quality at roughly half the cost, ideal for daily writing and analysis.
What Claude Sonnet 3.7 is best for
Everyday email and document writing
Editing and polishing existing copy
Summarising research and long articles
General coding help and explanations
Brainstorming with structured output
How to use Claude Sonnet 3.7
Step 1
Use Claude Sonnet 3.7 as your everyday writing workhorse: paste the email, document or copy you are working on and ask it to draft, edit or polish without spending premium credits.
Step 2
Ask Claude Sonnet 3.7 to summarize research or long articles into a structured set of takeaways when you want most of Sonnet 4's quality at roughly half the cost.
Step 3
Use follow-ups to tighten the wording, restructure into a cleaner outline, or get a quick coding explanation alongside the writing work.
Example prompts
Frequently asked questions
Is 3.7 good enough vs Sonnet 4?
For most users, yes. The gap shows up on the hardest reasoning and creative-writing tasks.
What does Anthropic do differently?
Anthropic's Constitutional AI approach focuses on safe, helpful responses, which often results in clearer and more cautious answers.
Can I upload files to Claude here?
File uploads are part of the Pro plan. Free users can paste content directly into the chat.
How recent is its training data?
Claude 3.7 Sonnet's knowledge cutoff is in 2024. For current events, use a Perplexity search model.
