Claude Sonnet 3.5
Anthropic's fast, capable everyday AI assistant for writing, analysis and coding.
Best for day-to-day Claude use when you want speed more than the largest model.
Our take
Treat this page as a pointer to Anthropic’s faster everyday model, not as a guarantee of the exact version name. Sonnet-class models are the ones to try first for writing and routine analysis. Move up a tier only when a harder task fails.
What to use it for
Speed
The point of this tier is a capable answer without waiting on the largest model.
Context
Enough for a normal document. A very long file is a reason to check the current context limit.
Safety defaults
Refusals are part of the product. Rephrase a legitimate task instead of trying to trick it.
Check before you pay
- Anthropic retires model names. Confirm Sonnet, or its successor, is what your plan includes.
- A free tier may exist and may not include this model. Check the pricing page.
How to decide
Run Claude Sonnet 3.5 on a few of your own tasks and compare the result with one alternative before you pay. Check how your data is handled, estimate a realistic month, and keep a person responsible for the output. The 5-question framework is the longer version of that test, and the safe-use checklist covers privacy and accuracy.