Claude Sonnet 4
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Claude 4 Makes Surprise Debut: Runs Non-Stop for 7 Hours
Anthropic unveils Claude 4, featuring Opus 4 and Sonnet 4. Both models excel in programming and reasoning, with Opus 4 demonstrating remarkable endurance by refactoring code for seven hours straight. Key advancements include dual-mode reasoning, external memory, and tool usage. The official Claude Code is also released. Sonnet 4 is now free for all users, while developers gain new API features like code execution and file API. Pricing for Opus 4 and Sonnet 4 is competitive.
