Anthropic

Claude Sonnet 5

Fast and balanced — the everyday default.

Claude Sonnet 5 trades a little of Opus's depth for noticeably lower cost and quicker replies. It's the default on vexer because it handles the large majority of day-to-day questions well without running up your balance.

Strengths

• Quick, capable answers for everyday coding and writing
• Strong instruction-following at a lower per-message cost
• A good balance of speed and quality for iterative work

Best for

• Day-to-day coding help and quick refactors
• Drafting, editing and summarising
• High-volume chats where cost per message matters

Use claude-sonnet-5 in the API, or pick Claude Sonnet 5 in the chat. Compare it in the model catalog.